Abstract: Provided is a manufacturing method of a surface-treated Zn—Ni alloy electroplated steel sheet, the method comprising the steps of: preparing a Zn—Ni alloy electroplated steel sheet including a steel sheet and a Zn—Ni alloy-plated layer with an Ni content of 5-20 wt % (S1); preparing an alkaline electrolyte solution in which 4-250 g/L of potassium hydroxide (KOH) or sodium hydroxide (NaOH) or both combined are added in distilled water (S2); and inside the alkaline electrolyte solution, placing the Zn—Ni alloy electroplated steel sheet as an anode and installing another metal sheet as a cathode, and applying 2-10 V of an alternating or direct current to conductor electrochemical etching such that a 3-point average value of the arithmetic average roughness (Ra) of the surface of the Zn—Ni alloy electroplated steel sheet reaches 200-400 nm, thereby producing a surface-treated electroplated steel sheet (S3).

Abstract: An austenitic steel sheet excellent in resistance to delayed cracking is provided. The composition of said steel comprises in weight: 0.35%?C?1.05% 15%?Mn?26% Si?3% Al?0.050% S?0.030% P?0.080% N?0.1%, at least one metallic element X chosen among vanadium, titanium, niobium, molybdenum, chromium 0.050%?V?0.50%, 0.040%?Ti?0.50% 0.070%?Nb?0.50% 0.14%?Mo?2% 0.070%?Cr?2%. The composition may optionally include B, Ni and/or Cu. The remainder of the composition includes iron and unavoidable impurities inherent to fabrication, including hydrogen. The quantity Xp of the at least one metallic element under the form of carbides, nitrides or carbonitrides is, in weight: 0.030%?Vp?0.40% 0.030%?Tip?0.50% 0.040%?Nbp?0.40% 0.14%?Mop?0.44% 0.070%?Crp?0.6%. The hydrogen content Hmax designating the maximal hydrogen content that can be measured from a series of at least five specimens, and the quantity Xp, in weight, is such that: 1000 ? H max X P ? 3.3 .

Abstract: The present invention provides a deformed part created by forming a coated metal sheet into a part, the coated metal sheet comprising a steel substrate, at least one face of which is coated with a metal coating deposited by dipping the substrate in a bath, said coating comprising between 0.2 and 0.7% by weight of Al, the remainder of the metal coating being Zn and inevitable impurities, wherein an outer surface of a metal coating of the deformed part has a waviness Wa0.8 of less than or equal to 0.43 ?m.

Abstract: The invention provides methods for manufacturing warm press-formed members which can ensure post-coating corrosion resistance. A method for manufacturing warm press-formed members includes heating a steel sheet to a temperature in the range from 200 to 800° C. and warm press-forming the steel sheet at a temperature in the above range of temperatures, the steel sheet having a Zn—Ni alloy coating layer on its surface, the coating layer including 10 to 25 mass % Ni and the balance being Zn and inevitable impurities and having a coating weight of 10 to 90 g/m2.

Abstract: An elastic coupling device for elastically connecting a damping mass like a gas generator to a motor vehicle part exposed to oscillations and/or vibrations, in particular an airbag module, in one embodiment comprising a rigid support ring facing the vehicle, at least one fixation piece like a rivet head, the fixation piece facing the damping mass and being made of a rigid material, and a spring body coupling the support ring and the fixation piece. The support ring and/or the fixation piece, respectively made of a plastic material, as well as the spring body, which may be made of an elastomer material, may be produced in a single manufacturing step by means of a two-component process, in particular by two-component injection molding.

Abstract: A process is disclosed for coating a substrate. The process includes providing a substrate having at least one free surface; depositing a first layer of a first material on the free surface of the substrate; depositing a second layer of a second material, different from the first material, on the first layer; depositing a third layer of a third material, different from the first and second materials, on the second layer; depositing a protective layer of a fourth material, different from the first, second and third materials, on the third layer; and performing a reflow of at least the second and third layers from the first, second, and third layers, by transfer of heat through the thermal contact on the protective layer, such that the protective layer prevents oxidation of at least the third layer.

Abstract: A slide member is provided with a base material, a plated slide layer and an intermediate plated layer. The plated slide layer contains a solid lubricant. The intermediate plated layer is disposed between the base material and the plated slide layer, the intermediate plated layer increasing cohesion of the base material and the plated slide layer. The plated slide layer has a content of the solid lubricant in a range from 30 to 70 vol %, inclusive.

Abstract: Provided is a copper foil for a printed wiring board including a roughened layer on at least one surface thereof. In the roughened layer, the average diameter D1 at the particle bottom being apart from the bottom of each particle by 10% of the particle length is 0.2 to 1.0 ?m, and the ratio L1/D1 of the particle length L1 to the average diameter D1 at the particle bottom is 15 or less. In the copper foil for printed wiring board, when a copper foil for printed wiring having a roughened layer is laminated to a resin and then the copper layer is removed by etching, the sum of areas of holes accounting for the resin roughened surface having unevenness is 20% or more. The present invention involves the development of a copper foil for a semiconductor package substrate that can avoid circuit erosion without causing deterioration in other properties of the copper foil.

Abstract: An aluminum alloy heat exchanger with aluminum alloy tubes is provided by assembling and brazing. A coating which includes from 1 to 5 g/m2 of Si powder, from 3 to 20 g/m2 of Zn containing flux, and from 0.2 to 8.3 g/m2 of binder is formed on the aluminum alloy tubes. The fins contain Zn and 0.8 to 2.0% by mass of Mn, Si in a ratio of 1/2.5 to 1/3.5 relative to the Mn, and less than 0.30% by mass of Fe. A fillet is formed between the tube and the aluminum alloy fin after brazing, and a primary crystal portion is formed in the fillet. A eutectic crystal portion is formed in a portion other than the primary crystal portion, and the electric potential of the primary crystal portion is equal to or higher than the electric potential of the aluminum alloy fin.

Abstract: The present application provides an ultrathin shielding film of high shielding effectiveness, comprising two or more solid shielding layers. An electrically-conductive adhesive layer is coated onto the outer surface at one side of the solid shielding layers, and one or more insulation film layers are formed on the outer surface at the other side of the solid shielding layers. A carrier film layer is provided on the outer surface of the insulation film layers. A protective film covers the lower surface of the electrically-conductive adhesive layer. The present application further discloses a manufacturing method of an ultrathin shielding film of high shielding effectiveness.

Abstract: A non-magnetic stainless steel wire with an adherent corrosion resistant coating is disclosed. The surface of the non-magnetic stainless steel is pre-treated so as to be sufficiently free from oxides and form a good adhesion with the above corrosion resistant coating. The non-magnetic stainless steel wire is used as a armouring wire for a power cable for transmitting electrical power.

Abstract: A connector terminal which can achieve high mechanical connection strength and stabilized low electrical connection resistance when it is crimped to an aluminum electric wire, and in addition, can suppress electrical contact resistance low when it is fitted to a mating connector terminal is provided. In a connector terminal (1A) having an electrical contact section (10) which is brought into contact and conducted with a mating connector terminal by fitting to the mating connector terminal, and a conductor crimping section (12) which is crimped to the conductor of an electric wire, a metal material which constitutes the terminal uses aluminum or an aluminum alloy as a base material (100), a Zn layer (101) having a thickness in the range from 0.1 ?m to 2.0 ?m by electroless plating and a Cu layer (102) having a thickness in the range from 0.5 ?m to 1.0 ?m by electrolytic plating are formed in sequence on the surface of the base material (100), and an Sn layer (105) having a thickness in the range from 0.

Abstract: Provided is an industrially excellent surface-treated copper foil which satisfies requirements for adhesiveness to an insulating resin such as polyimide, heat-resistant adhesiveness, chemical resistance and soft etching properties. Also provided is a method for producing a surface-treated copper foil which achieves a high adhesion strength between an insulating resin and the copper foil, shows high chemical resistance in circuit formation and sustains good soft etching properties after forming vias by laser-processing. A base copper foil is subjected to a roughening treatment to give a surface roughness (Rz) of 1.1 ?m or below. On the roughened surface, an Ni—Zn alloy layer is formed. The aforesaid roughening treatment is conducted in such a manner that the roughened surface comprises sharp-pointed convexes, which have a width of 0.3-0.8 ?m, a height of 0.6-1.8 ?m and an aspect ratio of 1.2-3.5, and the surface roughness (Rz) of said base copper foil is increased by 0.05-0.3 ?m.

Abstract: The invention relates to a thermal spraying material (5) for the coating of a surface of a workpiece by means of a thermal spraying method, wherein the spraying material (5) contains zinc. The invention further relates to a thermal spraying method and to a thermally sprayed coating sprayed with the material (5).

Abstract: Steel strip provided with a hot dip galvanized zinc alloy coating layer, in which the coating of the steel strip is carried out in a bath of molten zinc alloy, the zinc alloy in the coating consisting of: 0.3-2.3 weight % magnesium; 0.6-2.3 weight % aluminum; optional <0.2 weight % of one or more additional elements; unavoidable impurities; the remainder being zinc in which the zinc alloy coating layer has a thickness of 3-12 ?m.

Abstract: Provided are: a conductive base for forming a wiring pattern of a collector sheet for solar cells, which has good rust inhibiting properties and solderability without using an organic rust inhibitor that may harm a solar cell element; and a method for producing a collector sheet for solar cells, said method using the conductive base. A conductive base for forming a wiring pattern of a collector sheet for solar cells, which is a conductive base (30) wherein a zinc layer (320) composed of zinc is formed on the surface of a copper foil (310), is used. The conductive base for forming a wiring pattern of a collector sheet for solar cells is characterized in that the zinc layer (320) does not contain chromium and the amount of zinc therein is more than 20 mg/m2 but 40 mg/m2 or less.

Abstract: Disclosed is a method of applying a zinc complex film, including forming a zinc complex film on a surface of a substrate, performing high-frequency curing at about 90˜110° C. for about 18˜22 min, and performing painting and drying as post-treatment. Further disclosed are a method of coating a brake caliper using the zinc complex film, and to a brake caliper thus coated.

Abstract: The present invention generally relates to an aqueous solution for the formation of a passivation layer on a zinc layer or zinc-alloy layer. More particularly, the invention relates to the formation of a black passivation layer on a zinc layer or zinc-alloy layer, which passivation layer is substantially free of hexavalent chromium. Furthermore, the present invention relates to method for the formation of a passivation layer on a zinc layer or zinc-alloy layer, as well as a passivation layer on a zinc layer or zinc-alloy layer itself. The solution used contains trivalent chromium ions, nitrate ions, an organic acid and a dithioglycolate.

Abstract: The present invention relates generally to jewelry articles comprising a substrate and a metallic, external coating.

Abstract: The present invention relates generally to a coated jewelry article or a coated component of a jewelry article, comprising a jewelry article or a component of a jewelry article, a first metallic coating, and a second metallic coating.

Abstract: A solder and a solder joint structure formed by the solder are provided. The solder includes a zinc-based material, a copper film, and a noble metal film. The copper film completely covers the surface of the zinc-based material. The noble metal film completely covers the copper film. The solder joint structure includes a zinc-based material and an intermetallic layer. The intermetallic layer consists of zinc and noble metal and completely covers the surface of the zinc-based material.

Abstract: It is provided a steel with composite plating film providing rust prevention over a long time period and a method of manufacturing thereof. A composite plating film 24 is formed on a metal material 21. The film 24 has a plating film 23 made of a sacrificial anode metal and photocatalyst particles 22 dispersed and fixed in the plating film 23. The photocatalyst particle has a main body composed of a photocatalyst and a semiconductor material supported thereon. The composite plating film 24 is formed on the surface of the metal material 21 by electroplating, hot-dipping, chemical plating or the like.

Abstract: Provided is a rolled copper foil or electrolytic copper foil for an electronic circuit to be used for forming a circuit by etching, wherein the copper foil comprises a nickel or nickel alloy layer with a lower etching rate than copper formed on an etching side of the rolled copper foil or electrolytic copper foil, and a heat resistance layer composed of zinc or zinc alloy or its oxide formed on the nickel or nickel alloy layer.

Abstract: The present invention provides a high corrosion resistance hot dip galvannealed steel material comprised of a Zn-based hot dip plated steel material achieving both a higher corrosion resistance of the plated layer itself by the added elements and sacrificial protection of iron metal by the plated layer or workability free of degradation caused of formation of intermetallic compounds by added elements, that is, a high corrosion resistance hot dip Zn plated steel material characterized in that an alloy plated layer containing Zn: 35 mass % or more, preferably 40 mass % or more, contains a non-equilibrium phase having a heat capacity by differential scanning calorimetry of 1 J/g or more. Furthermore, 5% or more, preferably 50% or more in terms of vol % is an amorphous phase. The alloy layer may contain, by mass %, Mg: 1 to 60% and Al: 0.07 to 59%, may further contain one or more elements selected from Cr, Mn, Fe, Co, Ni, and Cu in a total of 0.1 to 10%, and may in addition contain one or more elements of 0.

Abstract: A zinc-based metal plated steel sheet is excellent in tribological properties during press forming. An oxide layer containing crystalline 3Zn(OH)2.ZnSO4.xH2O is formed on a plated surface. The oxide layer has a thickness of 10 nm or more. The crystalline oxide layer is composed of 3Zn(OH)2.ZnSO4.3-5H2O.

Abstract: A coated article is described. The coated article includes a substrate, a combining layer formed on the substrate, a plurality of silicon dioxide layers and a plurality of copper-zinc alloy layers formed on the combining layer. The combining layer is a silicon layer. Each silicon dioxide layer interleaves with one copper-zinc alloy layer. A method for making the coated article is also described.

Abstract: The invention discloses a zinc-iron alloy layer material having a body centred cubic crystal structure of the ?-phase, a (330) texture and an iron content of 12 to 20 wt.-% deposited from an alkaline aqueous plating bath. The zinc alloy layer material provides a high corrosion protection to metallic substrates, has a high hardness and a bright appearance.

Abstract: An object of the present invention is to provide a copper foil excellent in softening resistance performance which reduces decrease in tensile strength after heat treatment at about 350° C. to 400° C. In order to achieve the object, a surface-treated copper foil provided with a rust-proofing treatment layer on both surfaces of a copper foil in which a rust-proofing treatment layer is constituted by zinc, and the either rust-proofing treatment layer is a zinc layer having zinc amount of 20 mg/m2 to 1,000 mg/m2; and the copper foil contains one or two or more of small amount elements selected from carbon, sulfur, chlorine and nitrogen, and a sum amount thereof is 100 ppm or more is adopted.

Abstract: Provided is a rolled copper foil or electrolytic copper foil for an electronic circuit to be used for forming a circuit by etching, wherein the copper foil comprises a heat resistance layer composed of zinc or zinc alloy or its oxide formed on an etching side of the rolled copper foil or electrolytic copper foil, and a layer of nickel or nickel alloy, which is a metal or alloy with a lower etching rate than copper, formed on the heat resistance layer.

Abstract: The disclosed junction material, manufacturing method thereof, and manufacturing method of junction structure utilize lead-free materials and ensure a high reliability of the junction between a semiconductor element and a frame or substrate, or, between a metal plate and another metal plate. For junctions between a semiconductor element and a frame or substrate, by using as the JUNCTION MATERIAL a laminate material comprising a Zn-based metallic layer (101), Al-based metallic layers (102a, 102b) on both sides thereof, and X-based metallic layers (103a, 103b) (X=Cu, Au, Ag or Sn) on the outside of both the Al-based metallic layers (102a, 102b), even in an oxygen-rich environment, the superficial X-based metallic layers protect the Zn and Al from oxidation until said junction material melts, preserving the wettability and bondability of said junction material as solder and securing the high reliability of the junction.

Abstract: A method for depositing nickel-metal layers for colouring surfaces, and a bath for depositing such a layer. This is made possible by depositing a nickel-metal layer from a bath for the electroless deposition of nickel which contains at least one further metal compound, a voltage being additionally applied enable the metal of the metal compound to be incorporated while forming a nickel-metal layer.

Abstract: A fastening mechanism includes a basic body made from a base metal, onto which at least one corrosion-resistant layer is applied. A further layer is applied at least partially onto the at least one corrosion-resistant layer. The further layer has a lower coefficient of friction than the at least one corrosion-resistant layer.

Abstract: The invention relates to a process for treating a metallic surface of an object with an aqueous copper-plating solution, with which a first copper-plating solution, which is free of cyanide and free of strong reducing agent, is electrolessly applied to clean metallic surfaces of the object, or after pretreatment to cleaned metallic surfaces, to form a first copper layer or copper alloy layer as a barrier layer and/or as a conductive layer, and also to the use of the objects produced by the process according to the invention.

Abstract: A chain component part has a first coating film formed on an iron base material using a water-based rust preventive paint containing a water-based rust preventive pigment containing a nitrate and having good storing stability. Since zinc is eluted earlier, generation of red rust caused by iron is suppressed, and thus durability is improved. A roller chain includes a zinc-iron alloy ground layer formed on an iron base material by impact zinc plating, a first coating film formed using the water-based rust preventive paint, and a second coating film formed using a water-based top coat paint containing a water-based pigment and a water-soluble or hydrolyzable silane coupling agent containing an amino group.

Abstract: A method for manufacturing a plate including multiple metal layers is provided. The method includes: disposing a semi-finished plate formed of a first metal in a mold, wherein a surface of the semi-finished plate is roughened; and injecting a second metal in liquid form onto the roughened surface of the semi-finished plate, so as to form a second metal layer on the semi-finished plate, wherein the second metal in liquid form covers and fills the roughened surface of the semi-finished plate. Not only does the multi-layer metal plate manufactured according to the method have the strength and elasticity of a composite metal, but also increase the joining, bonding or engagement strength between the first and second metal layers without laser welding.

Abstract: A coated article is described. The coated article includes a substrate, a combining layer formed on the substrate, a plurality of chromium nitride layers and a plurality of copper-zinc alloy layers formed on the combining layer. The combining layer is a chromium layer. Each chromium nitride layer interleaves with one copper-zinc alloy layer. A method for making the coated article is also described.

Abstract: Disclosed herein is an article comprising a plurality of domains fused together; wherein the domains comprise a core comprising a first metal; and a first layer disposed upon the core; the first layer comprising a second metal; the first metal being chemically different the second metal. Disclosed herein too is a method comprising rolling a sheet in a roll mill; the sheet comprising a first metal and having disposed upon each opposing face of the sheet a first layer that comprises a second metal; the second metal being chemically different from the first metal; cutting the sheet into a plurality of sheets; stacking the plurality of sheets; and rolling the stacked sheets in the roll mill to form a blank.

Abstract: There are provided an electrode foil which has both the functions of a supporting base material and a reflective electrode and also has a superior thermal conductivity and heat resistance; and an organic device using the same. The electrode foil comprises a metal foil; a diffusion prevention layer for preventing diffusion of metal derived from the metal foil, the diffusion prevention layer being provided directly on the metal foil; and a reflective layer provided directly on the diffusion prevention layer.

Abstract: A contoured metal building panel comprising an inner layer formed from a piece of flexible material that has been manipulated to create contours along its surface and an outer coating that substantially encases and hardens the flexible material so that the contours are substantially rigid and fixed.

Abstract: A method of manufacturing a hot dip galvannealed steel sheet, including the steps of: subjecting a steel sheet to hot dip galvanizing to manufacture a hot dip galvanized steel sheet; heating the hot dip galvanized steel sheet for alloying; subjecting the hot dip galvanized steel sheet to temper rolling; bringing the temper-rolled hot dip galvanized steel sheet into contact with an acid solution containing at least one ion selected from the group consisting of Zr ions, Ti ions, and Sn ions to thereby form an acid solution film on the surface of the steel sheet; after completion of the contact, a state where the acid solution film is formed on the surface of the steel sheet is held for at least 1 second; and washing with water the hot dip galvanized steel sheet after holding, to thereby form a Zn oxide layer having a thickness of 10 nm or more on the surface of the galvanized steel sheet.

Abstract: Disclosed is a copper foil which has excellent high frequency characteristics and heat resistance, while achieving high heat-resistant adhesion to a resin substrate at the same time. Specifically disclosed is a heat-resistant copper foil which has a configuration wherein a first roughened surface layer which has been treated by a first roughening treatment by copper metal, a second roughened surface layer which has been treated by a second roughening treatment by copper metal, and a third treated surface layer which has been treated by a third treatment process by zinc metal are sequentially provided on one surface of an untreated copper foil.

Abstract: A zinc-based metal plated steel sheet is excellent in tribological properties during press forming. An oxide layer containing crystalline 3Zn(OH)2·ZnSO4·xH2O is formed on a plated surface. The oxide layer has a thickness of 10 nm or more. The crystalline oxide layer is composed of 3Zn(OH)2·ZnSO4·3-5H2O.

Abstract: A coating composition for zinc- and zinc alloy-coated steel sheets includes: 1 to 30% by weight of hypophosphorous acid, 0.1 to 10% by weight of manganese, 0.01 to 5% by weight of a polyvinyl compound, zinc oxide and the balance of water, and further comprises 20% by weight or less of alcohol, when necessary, wherein the zinc oxide is included in such a content that, when 50 Ml (milliliters) of the coating composition is neutralized and titrated with 0.1N NaOH, the NaOH used for the neutralization titration is present in an amount of 10.0 Ml (milliliters) or less, and a content of free acid in the coating composition is adjusted to such an amount that, when 50 Ml (milliliters) of the coating composition is neutralized and titrated with 0.1N NaOH, the NaOH used for the neutralization titration is present in an amount of 10.0 Ml (milliliters) or less.

Abstract: A copper foil comprising a plated layer containing nickel and zinc on a copper foil made of an electrolytic copper foil or a rolled copper foil, and a chromium plated layer on the plated layer containing nickel and zinc, wherein the zinc in the plated layer containing nickel and zinc is made of zinc oxide and metal zinc, and the ratio of metal zinc in the zinc oxide and metal zinc is 50% or less. This invention relates to a copper foil for a flexible printed board formed with a polyimide-based resin layer and in particular provides a copper foil having superior adhesive strength between the copper foil and the polyimide-based resin layer, having acid resistance and tin plating solution resistance, having high peel strength, comprising favorable etching properties and gloss level, and suitable for use in a flexible printed board capable of achieving fine patterning of wiring.

Abstract: A housing includes a magnesium or magnesium alloy substrate, a first metal layer formed on the substrate by physical vapor deposition, and a second metal layer formed on the first metal layer by electroplating. The first metal layer is comprised of one or more metals selected from the group consisting of zinc, iron, copper, and nickel.

Abstract: Provided is a copper foil for a printed circuit board comprising a layer including nickel, zinc, a compound of nickel and that of zinc (hereinafter referred to a “nickel zinc layer”) on a roughened surface of a copper foil, and a chromate film layer on the nickel zinc layer, wherein the zinc add-on weight per unit area of the nickel zinc layer is 180 ?g/dm2 or more and 3500 ?g/dm2 or less, and the nickel weight ratio in the nickel zinc layer {nickel add-on weight/(nickel add-on weight+zinc add-on weight)} is 0.38 or more and 0.7 or less. This surface treatment technology of a copper foil is able to effectively prevent the circuit corrosion phenomenon in cases of laminating a copper foil on a resin base material and using a sulfuric acid hydrogen peroxide etching solution to perform soft etching to the circuit.

Abstract: A highly corrosion-resistant, rust-prevention coating material comprising: an inorganic binder; and Zn metal particles comprised of Zn and unavoidable impurities and dispersed in the binder at the rate of 30 mass % or greater based on a dry coating film, wherein (i) the Zn metal particles include (i-1) fine-grain Zn metal particles of 0.05 to 5 ?m peak grain diameter whose grain-diameter distribution has a grain-diameter frequency distribution with a single peak and a tail on either side of the peak and (i-2) coarse-grain Zn metal particles of 6 to 100 ?m peak grain diameter whose grain-diameter distribution has a grain-diameter frequency distribution with another single peak and a tail on either side of the peak, and wherein (ii) the percentage of all Zn metal particles accounted for by Zn metal particles of 0.05 to 5 ?m grain diameter expressed in volume percentage is 5 to 99%.

Abstract: Zn alloy particles for high corrosion resistance rust prevention paint containing, by mass %, Mg: 0.01 to 30% and having a balance of Zn and unavoidable impurities, having physical fracture facets and/or cracks of a length of 0.01 ?m or more or cracks of a depth of 0.01 ?m or more, having an average particle size of 0.05 to 200 ?m, and having an aspect ratio of maximum size and minimum size (maximum size/minimum size) of an average value of 1 to 1.5. Also, a high corrosion resistance rust prevention paint containing these Zn alloy particles and a high corrosion resistance steel material and steel structure coated with that paint.

Abstract: Disclosed is a refrigeration circuit-forming member which has a metal surface and is used for a refrigeration circuit in which HFO-1234yf that is a refrigerant configured of molecules having a double bond is used. The metal surface, which comes into contact with the HFO-1234yf, is covered with a coating layer that is not reactive with the HFO-1234yf within the range of temperature at which the HFO-1234yf is used. The coating layer is formed of any of a coating film that is firmly fixed to the metal surface, a coating layer that is formed by adhesion of a specific component added into the lubricant oil, and a coating layer that is formed by modification of the metal surface layer itself that forms the metal surface. Consequently, the chemical instability that is caused when the refrigerant HFO-1234yf comes into contact with the metal can be eliminated.

Abstract: In order to produce a wire electrode having a core consisting of a copper/zinc alloy and to produce a specific sheath layer, the sheath layer is coated onto the core at a temperature at which no diffusion occurs. The wire electrode is subsequently heated at a heating speed higher than 10° C. per second, briefly annealed at temperatures above 500° C. and subsequently cooled again very rapidly at cooling speeds higher than 10° C. per second.