Abstract: Disclosed are: a flux composition which is used for brazing of a magnesium-containing aluminum alloy material, suppresses the formation of high-melting compounds, provides better wettability, and thereby exhibits better brazability even applied in a small mass of coating; and a brazing sheet using the flux composition. The flux composition for brazing of a magnesium-containing aluminum alloy material includes a flux component [A] containing fluorides as principal components; and an additive [B] being at least one selected from the group consisting of CeF3, BaF2, and ZnSO4. The flux component [A] preferably contains KF in a content of 40 percent by mass or more and 60 percent by mass or less; and AlF3 in a content of 40 percent by mass or more and 60 percent by mass or less.

Abstract: Aluminum parts, e.g., heat exchangers, with improved resistance towards corrosion caused by contact with stationary water or aqueous compositions such as cooling water can be obtained by addition of Li compounds in specific amounts to the flux used for brazing the parts. LiF and especially Li fluoroaluminates are very suitable. The flux and the Li salt can be dispersed in water or an aqueous composition separately.

Abstract: Aqueous flux preparations with increased dynamic viscosity are provided. In the flux preparations, irreversibly dehydrated K2AlF5 (also denoted as orthorhombic K2AlF5 or phase II salt) provides for an increase of the dynamic viscosity if the aqueous flux preparations are aged, i.e., a contact between water comprised in the preparation and irreversibly dehydrated K2AlF5 is maintained for a certain time span, preferably for at least 12 minutes. The higher viscosity improves the brazing process, for example because less flux preparation drops off from the parts to be brazed.

Abstract: A clinker composition including, relative to the clinker total weight: from 30 to 85% Al2O3; from 3 to 45% CaO; from 9 to 45% MgO and having an apparent porosity, such as measured by means of the apparent porosity underwater measurement assay according to modified NF B40-312 standard ranging from 4% to 60%.

Abstract: A flux for application on and for reduction of oxide layers on a metal surface. The flux includes potassium fluoride, sodium fluoride, remaining moieties of water and gelatin. The can also include a reactant comprising moieties of at least one of the compositions of zirconium fluoride, lithium fluoride, sodium fluoride, potassium cryolite and potassium aluminum fluoride (KaAlF4), moieties of salts on the basis of at least one of the elements zirconium, lithium, potassium, sodium, bismuth boron and titanium and gelatin. The flux can be used in a method to reduce oxide layers on a metal surface by applying the flux onto the metal surface.

Abstract: A welding flux for stainless steel including 30-55 wt % of silicon dioxide, 20-40 wt % of titanium dioxide, 10-20 wt % of chromium oxide, 5-20 wt % of molybdenum oxide, 5-10 wt % of molybdenum sulfide, and 5-10 wt % of halide.

Abstract: Boric acid-free fluxes based on inorganic boron compounds for brazing metallic materials in combination with silver, copper or nickel base solders are known. Starting from this, in order to provide a further flux for brazing that is free of boric acid and contributes to a good wetting of the workpieces to be joined and that is distinguished by residues of low corrosivity, it is suggested according to the invention that the boron compounds should comprise potassium pentaborate and potassium metaborate, the ratio of the weight parts of potassium pentaborate and potassium metaborate being in the range between 4 and 10.

Abstract: According to one embodiment t of the present invention a method of manufacturing metal-to-ceramic seals comprising the steps of: (a) providing a ferric stainless steel part selected from the group consisting of high temperature stainless steels and high temperature superalloy; (b) providing a ceramic part; (c) providing a braze material in between the ferric stainless steel part and said ceramic part, the braze containing Ag and metal oxide wetting agents; and (d) heating said ferric stainless steel part, braze material, and ceramic part in an oxidizing atmosphere.

Abstract: A highly basic particle flux for submerged arc welding that produces less than 7 ml/100 gr of diffusible hydrogen in the weld metal, which flux comprises a carbon dioxide containing compound with an effective amount of heat releasable carbon dioxide in the range of 0.5-3.5% by weight of the flux over 10% by weight of a low melting point compound and a binder.

Abstract: A Penetration Enhancing Activating Flux (PEAF) in paste form for autogenous TIG welding of austenitic stainless steels adapted for ready application with a brush on top weld surface prior to conducting autogenous TIG welding to favour single weld pass, of austenitic stainless steels of AISI 304LN and AISI 316LN varieties with weld bead penetration up to a section thickness of 12 mm. Importantly, the above (PEAF) paste based TIG welding of the invention achieves an increase in weld bead penetration of about 300% over the conventional TIG process without activating flux. The PEAF paste based TIG welding also favours higher productivity and high quality apart from being cost-effective due to less requirement of consumables and controlled heat input to arrest distortion, making it widely acceptable for variety of industrial applications for welding of austenitic stainless steel.

Abstract: A conversion coating composition for coating a metal substrate is provided which imparts corrosion resistance to the underlying metal substrate. The conversion coating composition comprises an aqueous carrier and first and second rare earth element salts. A complete coating system employing the conversion coating composition is also provided as well as methods for conversion coating a metal substrate with the rare earth element conversion coating compositions of the present invention.

Abstract: Chromate-free compositions for applying a conversion or passivation coating for metals, more particularly zinc coated metal surfaces. The methods of the invention comprise contacting the requisite metal surface with a phosphonomethylated polyamine. Other aspects of the disclosed tech involve methods and compositions in which the following optional components can be included: fluoacid, silane, inorganic phosphorus, acid, latex film forming component and pH adjustment agent.

Abstract: The invention relates to a soldering flux based on potassium fluoroaluminates, wherein the zirconium fluoride and/or titanium fluoride is added to the soldering flux. The invention also relates to a corresponding soldering method.

Abstract: A pellet for use in die bonding of an electronic chip and a substrate in an electronic component generates minimized voids in spite of the pellet being made of a lead-free solder. The pellet forms a colorless transparent protective film comprising Sn-(30-50 at % 0)-(5-15 at % P) or Sn-(10-30 at % In)-(40-60 at % O)-(5-15 at % P) when heated for soldering, has a thickness of 0.05-1 mm, and has generally the same shape as the semiconductor chip to be bonded to the substrate.

Abstract: A granular flux having controlled amounts of titanium and boron to facilitate in the formation of a weld metal having a high toughness without requiring refinement of the weld metal by reheating the weld metal, and enabling the slag to be easily removed from the weld bead.

Abstract: A welding flux that includes a flux agent and a binder. The binder includes a colloidal binder formed from small particles of silicon dioxide. The binder can be dried at lower temperatures to thereby for a greater range of fluxing agents and/or metal alloys to be included in the welding flux. The colloidal binder can constitute 100 percent of binder or form only part of the binder.

Abstract: The present invention provides a Sn—Zn based lead-free solder which can prevent peeling of solder from soldered portions even after the passage of long periods after soldering of portions to be soldered made of Cu. A Sn—Zn based lead-free solder according to the present invention comprises 5-10 mass percent of Zn, a total of 0.005-1.0 mass percent of at least one substance selected from the group consisting of Au, Pt, Pd, Fe, and Sb, optionally a total of at most 15 mass percent of at least one substance selected from the group consisting of Bi and In, and a remainder of Sn. This Sn—Zn based lead-free solder can be made into a solder paste using a rosin flux containing a halide such as an amine hydrochloride as an activator.

Abstract: A stainless steel slab containing B, wherein a protecting material is joined onto at least two faces across the bloom from each other in a stainless steel bloom containing B of 0.3–2.5 mass %, being integrated into one-piece by forming a weld metal comprising a stainless steel with chemical composition that satisfies the relationship expressed by following formulas (1)–(4), and a method to produce a steel product by rolling said slab. Further, it is preferable to interpose an insert material between above stainless steel bloom and above protecting material in bonding process. 15?Cr eq?30,??(1) 4?Cr eq?Ni eq?17,??(2) Cr eq=Cr+1.5 Si+Mo?5 B,??(3) Ni eq=Ni+30 (C+N)+0.5 Mn??(4) Herein, each symbol of a chemical element designates the content (mass %) of relevant chemical element contained in steel.

Abstract: An aluminum alloy filler material for use in welding of metal members including at least one aluminum die-cast member containing Mg includes an aluminum or an aluminum alloy as base material and Al—K—F series flux. The Al—K—F series flux is contained by 2 to 4 mass % with respect to the entire filler material.

Abstract: A welding flux for use in welding stainless steel parts to increase welding penetration, consisting essentially a base material obtained from manganese peroxide (MnO2), and an activator selected from a material group that includes zinc oxide (ZnO), silicon dioxide (SiO2), chromium oxide (CrO2), titanium dioxide (TiO2), molybdenum dioxide (MoO2), and iron oxide (Fe2O2).

Abstract: A welding flux that includes a flux agent and a binder. The binder includes a colloidal binder formed from small particles of silicon dioxide. The binder can be dried at lower temperatures to thereby for a greater range of fluxing agents and/or metal alloys to be included in the welding flux. The colloidal binder can constitute 100 percent of binder or form only part of the binder.

Abstract: A flux for hot dip galvanization comprises from 60 to 80 wt % of zinc chloride (ZnCl2); 7 to 20 wt % of ammonium chloride (NH4Cl); 2 to 20 wt % of a fluidity modifying agent comprising at least one alkali or alkaline earth metal; 0.1 to 5 wt % of at least one of the following compounds: NiCl2, CoCl2, MnCl2 and 0.1 to 1.5 wt % of at least one of the following compounds: PbCl2, SnCl2, BiCl3 and SbCl3.

Abstract: The invention relates to a flux salt composition for flux baths which is available for particularly simple regeneration and deferrizing. The deferrizing flux salt composition for flux baths, containing zinc chloride and alkali metal chloride, contains at least one or more alkalizing constituents and one or more constituents which, in aqueous solution, oxidize iron(II) to form iron(III).

Abstract: The invention relates to a soldering flux based on potassium fluoroaluminates, wherein the zirconium fluoride and/or titanium fluoride is added to the soldering flux. The invention also relates to a corresponding soldering method.

Abstract: Novel methods for producing alkali metal fluorozincates, especially potassium fluorozincate. Products having defined particle size ranges are obtained depending on the sequence of introduction of the reactants alkali metal hydroxide, zinc oxide and hydrogen fluoride. The resulting alkali metal fluorozincates are particularly suitable for use as a fluxing agent or fluxing agent additive during brazing of aluminum or aluminum alloys and can be applied by wet or dry fluxing methods depending on the particle size of the alkali metal fluorozincate particles.

Abstract: Novel methods for producing alkali metal fluorozincates, especially potassium fluorozincate. Products having defined particle size ranges are obtained depending on the sequence of introduction of the reactants alkali metal hydroxide, zinc oxide and hydrogen fluoride. The resulting alkali metal fluorozincates are particularly suitable for use as a fluxing agent or fluxing agent additive during brazing of aluminum or aluminum alloys and can be applied by wet or dry fluxing methods depending on the particle size of the alkali metal fluorozincate particles.

Abstract: The invention provides a water-soluble preflux that can solve problems with a soldering land array having a narrow spacing in that fused solder is likely to cause soldering bridges with defective soldering, a printed circuit board with its film formed thereon, and a surface treatment process for a metal in that circuit. The water-soluble preflux comprises given two different benzimidazoles compound and an iodine-based compound optionally with an amino acid, etc. The invention provides a printed circuit board with a film of that preflux formed thereon, and a surface treatment process for the metal in that circuit.

Abstract: The present invention relates to a novel flux useful for hot dip galvanizing of iron and iron based alloys. The present invention also relates to a process for the preparation of the flux and to the use thereof for hot dip galvanizing of iron an iron based alloys. The present invention also relates to a method for the hot dip galvanizing of iron and iron based alloys using the novel flux.

Abstract: A new soldering technique and solder alloy for wetting and joining hard-to-wet materials including titanium alloys such as nitinol uses a solder alloy containing tin and an active wetting promoting element such as aluminum in the presence of ultrasound. As shown in the Figure, molten solder alloy (10) is applied to the hard-to-wet material (18) with the application of ultrasonic energy (14) which removes coatings (20) such as tenacious surface oxides to leave the base material (18) which is readily wetted by the solder alloy (20).

Abstract: Components composed of aluminum or an aluminum alloy with a coating comprising an aluminum-silicon alloy deposited thereon by applying an alkali metal fluorosilicate and heating the resulting treated material. The alloy layer is effectively protected against re-oxidation by a non-corrosive, alkali metal fluoroaluminate layer (e.g. a potassium fluoroaluminate layer) which forms simultaneously.

Abstract: A flux based on inorganic boron and/or halogen compounds for brazing difficult to wet metallic materials with silver- and copper-based solders, which contains, as an activating addition, based on the total amount of the flux, 0.01-10 wt. % of elemental boron and 0.01-10 wt. % of at least one of the elements Mo, W, Mn, Co, Ni, Pd, Cu or Ag in the form of elements, alloys or compounds. The activating addition brings about a substantial increase in the wettability by the solder, particularly in the case of difficult to wet stock materials.

Abstract: The invention relates to a lead-free solder paste comprising a solder paste flux and solder alloy particles that are substantially lead-free wherein the solder paste flux comprises resin dissolved in a solvent and also includes undissolved resin particles less than 25 &mgr;m in size homogenously dispersed therein to provide improved solder alloy powder coalescence and substrate surface wetting while maintaining appropriate solder paste rheology for use in printed circuit board assembly processes.

Abstract: A filler wire for laser-welding an aluminum alloy is described, which comprises a base material of Aluminum-Silicon based alloy and a flux of Aluminum-Potassium-Fluorine-based composition. The amount of the flux in the base material is greater than 0 (zero) wt. % and less than approximately 1.0 wt. %.

Abstract: The invention is a method of forming a conversion coating on an aluminum surface. According to the method, the aluminum surface is conversion coated by first treating the surface with thermal degreasing or aqueous alkaline degreasing and then contacting the treated surface with an aqueous bath solution of KF. The concentration of KF in the solution is 2.0-25.0 wt. % and the temperature is 90-212° F. for at least 5 seconds.

Abstract: A method for producing zinc diammine chloride (ZDC) from a solution of zinc ammine sulfate and zinc ammine chloride by precipitating the ZDC by pH neutralization using hydrochloric acid. ZDC can be granulated for dry applications using melt granulation at about 340-360° F. Applications for ZDC include use in fertilizer formulation to provide a combination zinc/nitrogen source free of other metals and use as a galvanizing preflux adjuster. As a galvanizing preflux adjuster, ZDC addition is able to adjust the pH of the preflux while maintaining the desired zinc/ammonia ratio.

Abstract: Components made of aluminum and aluminum alloys can be brazed at temperatures of up to 600° C. using a fluxing agent composed of alkali fluorozincate or alkali fluoride/zinc fluoride mixtures. Other fluxing agents, for example those composed of potassium fluoroaluminate can be used in addition. Alkali fluorozincate fluxing agents, especially potassium and cesium fluorozincate fluxing agents, act not only as a fluxing agent but also improve the surface quality since zinc and alkali fluoroaluminates are deposited on the surface of the components. The invention also relates to new fluxing agents containing alkali metal fluorozincates.

Abstract: The production of a potassium fluoroaluminate having a low melting point, which can be used as a flux when soldering aluminum. The potassium fluoroaluminate is prepared in an aqueous medium from aluminum hydroxide, hydrogen fluoride and potassium hydroxide in a molar ratio of aluminum:fluorine:potassium of approximately 1:5:2. After drying at 80° C. under vacuum, the resulting potassium fluoroaluminate has a differential scanning calorimetry melting point of about 548° C.

Abstract: A method of making a brazing flux compound including the steps of dispensing a desired amount of each of a plurality of ingredients. Adding potassium bifluoride to a bowl and adding boric acid on top of the potassium bifluoride. Mixing the boric acid and potassium bifluoride to form a substantially smooth wet first paste. Adding potassium tetraborate to the first paste and mixing the potassium tetraborate with the first paste to form a substantially creamy second paste. Adding potassium fluoroborate to the second paste and mixing the potassium fluoroborate with the second paste to form a third paste. Adding potassium carbonate to the third paste and mixing until the potassium carbonate is completely dissolved thus forming a fourth paste. Heating the fourth paste for a predetermined time at a predetermined temperature such that the said fourth paste is substantially dried into a substantially solid flux and then reducing the substantially solid flux to a powder flux.

Abstract: A non-corrosive, non-hygroscopic silver brazing flux compound. In the preferred embodiment, the flux compound consists of potassium fluoroborate approximately 26% by weight, boric acid approximately 26% by weight, potassium bifluoride approximately 24% by weight, potassium tetraborate approximately 20% by weight, and potassium carbonate approximately 3.5% by weight. The method of making the flux compound and its non-corrosive and non-hygroscopic properties enables the flux compound to be especially suitable for use as either as a flux paste or dried and milled into a powder to be dispensed within a sheath of silver based filler material to form a flux cored brazing wire.

Abstract: A Li2SO4'Na2SO4 mixed flux for use in the synthesis of yttrium tantalate x-ray phosphors has been invented. The phosphors made with the mixed flux exhibit a dramatic increase XOF brightness, decreased persistence, and a reduced particle size.

Abstract: A flux which contains irreversibly dehydrated K2AlF5, for soldering light metal materials, in particular aluminum. The flux has the advantages of forming a very uniform flux coating on the workpiece or workpieces to be soldered and exhibiting outstanding flow of the solder. An appropriate soldering process, an aqueous flux suspension and preparation processes for the flux are also disclosed.

Abstract: Brazing or soldering materials which effectively improve the wettability of the brazing alloy or solder without using flux and a method of manufacturing such materials are provided. A metallic base is placed on turntable inside a vacuum chamber. A copper target is affixed to a sputtering electrode above the metallic base. Air is removed from the vacuum chamber through a vacuum outlet to increase the vacuum therein to a specific pressure, and carbon tetrafluoride and argon are introduced from a gas inlet to control the sputter pressure. Thereafter, turntable is rotated while a high frequency voltage is applied between the target and the metallic base to form a halide layer, such as a layer of copper fluoride, on a surface of metallic base.

Abstract: A gas shielded arc-welding flux cored wire having a steel-made sheath filled with flux. The flux cored wire containing, by weight % based on the total weight of the wire, 1.0% or more Si--Mn ferroalloy powder having a grain size of 212 .mu.m or less; 2.0 to 7.0% TiO.sub.2 ; 0.2 to 1.5% SiO.sub.2 ; 0.1 to 1.2% ZrO.sub.2 ; and 0.01 to 0.3% fluoride (F-converted value). The powder comprises, by weight %, 0.40 to 1.20% C, 5 to 12% Si, 19 to 42% Mn, and the balance of Fe, with Si 2.gtoreq.11.89-2.92 C-0.077 Mn (Equation (1)) satisfied.

Abstract: A method is disclosed of making a braze sheet for a brazed assembly. The method includes the steps of providing a sheet of a core material and a composition cladding and mechanically embedding a flux into the sheet.

Abstract: A flux composition for brazing of an aluminum material which can feed a proper amount of flux to an area to be joined at the time of brazing and at the same time can improve working environment, and a method for brazing of an aluminum material. The method comprises: coating an aluminum material to be joined with a flux composition comprising 0.5 to 25 parts by weight of a polymeric compound having a number average molecular weight of 50000 to 5000000 and comprising repeating alkylene oxide units, 5 to 30 parts by weight of a fluoride flux, and water added in such an amount as will provide a total amount of the composition of 100 parts by weight; heating the coated area to remove water; heating the coated area to decompose and remove the polymeric compound; and then conducting heating for brazing.

Abstract: A method for aluminum brazing, in which the addition of a solder is no longer necessary. For this purpose a flux is used which contains 6 to 50 wt-% of potassium fluorosilicate and 50 to 94 wt-% of potassium fluoroaluminate. The flux can be used, for example, in the form of an aqueous suspension or paste.

Abstract: A flux for brazing aluminum members comprising potassium tetrafluoroaluminate, potassium pentafluoroaluminate and oxyfluoroaluminum, accomplishing the brazing of aluminum members at temperatures 5.degree. C. to 20.degree. C. lower than the temperature of conventional brazing that uses fluoride fluxes. Thus, heating energy required for the brazing can thus be saved, and conventional brazing equipment can be used as it is, in principle, without any changes; and since no expensive elements are used in the fluxes, the cost of brazing aluminum members can be reduced.

Abstract: Relatively resilient flux encasings for solder preforms are obtained when a mixture of 5 to 30 wt. % potassium silicate having a molar ratio of K.sub.2 O:SiO.sub.2 ranging from 1:2.5 to 1:4.5, 0.5 to 10 wt. % concentrated phosphoric acid, 0.1 to 5 wt. % boric acid and 0 to 10 wt. % finely divided silicon dioxide, with the remainder water, is used as the binder.

Abstract: The production of a potassium fluoroaluminate having a low melting point, which can be used as a flux when soldering aluminum. The potassium fluoroaluminate is prepared in an aqueous medium from aluminum hydroxide, hydrogen fluoride and potassium hydroxide in a molar ratio of aluminum:fluorine:potassium of approximately 1:5:2. After drying at 80.degree. C. under vacuum, the resulting potassium fluoroaluminate has a differential scanning calorimetry melting point of about 548.degree. C.

Abstract: A flux which contains irreversibly dehydrated K.sub.2 AlF.sub.5, for soldering light metal materials, in particular aluminum. The flux has the advantages of forming a very uniform flux coating on the workpiece or workpieces to be soldered and exhibiting outstanding flow of the solder. An appropriate soldering process, an aqueous flux suspension and preparation processes for the flux are also disclosed.