Abstract: Processes and solutions for phosphating metal surfaces. The solutions are acidic aqueous phosphate solutions containing a) from 0.1 to 1.5 g/l of zinc ion; b) from 5 to 50 g/l of phosphate ion; c) from 0.2 to 4 g/l of manganese ion; d) at least 0.05 g/l of fluoride ion; e) less than 0.5 g/l of chloride ion; and f) a phosphating accelerator. The metal surface phosphated with the solution including galvanized steel, is free of white spots and is suitable for electrocoating.

Abstract: A galvanized steel sheet includes a galvanized coating layer having a coating weight of from about 20 to about 60 g/m2 formed on at least one surface of the steel sheet, and a zinc phosphate coating layer having a coating weight of from about 0.5 to about 3.0 g/m2 formed on the galvanized coating layer. The zinc phosphate coating layer contains from about 0.5 to about 10.0 percent by weight of magnesium, from about 0.1 to about 2.0 percent by weight of nickel, and from about 0.5 to about 8.0 percent by weight of manganese. However, the manganese content and the nickel content satisfy the following relationship: [Ni]×7.6−10.9≦[Mn]≦[Ni]×11.4 wherein [Mn] represents the manganese content, in percent by weight, and [Ni] represents the nickel content, in percent by weight. This steel sheet exhibits superior perforative corrosion resistance.

Abstract: The coating structure having a corrosion resistance of the invention contains a formation film formed on the surface of an aluminum alloy material. The formation film is subjected to a zirconium phosphate treatment. Because the zirconium phosphate reacts with an oxide film on the surface of the aluminum alloy to form a zirconium boehmite layer and to increase the adhesion of the coating material, a corrosion resisting structure is obtained without need of a sealing treatment while restraining the increase of the product cost. Also, a primer layer is formed on the outer surface of the formation film and the primer layer is composed of phosphomolybdic acid.

Abstract: An aluminum-containing metal material for, for example, a heat-exchanger for motorcars is surface-treated by chemically etching an Al-containing metal material surface, forming a first protective layer on the etched surface by a chemical conversion treatment with an aqueous solution of Zr phosphate or Ti phosphate, and coating the first protective layer with a second protective layer containing a hydrophilic resin including non-cross-linked hydrophilic functional groups and at least partially cross-linked reactive functional groups different from the hydrophilic functional groups, to impart high hydrophilicity and resistance to odor generation and corrosion to the aluminum-containing metal material surface.

Abstract: The present invention relates to a method for treating a surface of zinc or of an alloy of zinc and aluminum, said method comprising the step of treating said surface with an aqueous solution having a pH of below 3 and comprising a complex formed from at least one species of metal oxo ion in conjunction with at least one species of hetero ion, the metal oxo ion being selected from the group consisting of molybdate, tungstate and vanadate; the hetero ion being selected from the group consisting of phosphorus (V), aluminium (III), silicon (IV), manganese (II), manganese (IV), zirconium (IV), titanium (IV), tin (IV), cerium (III) and nickel (II); and with a film forming acid tolerant resin compatible with the selected ions.

Abstract: A heat curable bonding composition of the present invention comprises an aqueous solution containing phosphate ion (PO4−3) and chromium(III) ion (Cr+3, or trivalent chromium) and is substantially free of hexavalent chromium ions. The bonding composition may further contain at least one secondary cationic species. The bonding composition has a pH in the range of about 1 to about 3.5.

Abstract: A surface treated metal sheet which is coated with a layer comprising, as main components, a complex and/or salt between a rare earth metal element and an organic compound having in the molecule one or more functional groups selected from among —O—, ═O, —OH, —COOH, —NH2, ═NH, ═N—, —SH, —SO3H and phosphoric groups, and a matrix which physically holds the above and has adhesive power for metal sheets, as well as a metal surface treatment solution used therefor.

Abstract: An improved aluminide coating especially for superalloy substrates. Slurry coating compositions of eutectic metal alloy powders and of non-eutectic metal powders, including an elemental powder of a silicide-former in a heat-curable liquid binder. A process for coating the substrates and the coated metal parts. The coatings have improved resistance to developing cracks and to hot corrosion and oxidation.

Abstract: A metallic surface treating solution characterized in that it is an aqueous solution at pH 0.1 to 6.5 comprising a source of at least one selected from the group consisting of Mo, W, V, Nb, Ta, Ti, Zr, Ce, Sr, and trivalent chromium, an oxidizing substance source, and an oxyacid or oxyacid salt of phosphorus or its anhydride, a surface treating method using the treating solution, and metals thereby treated on the surface.

Abstract: A bonding composition for a heat curable overlay coating for coating a substrate is provided. The bonding composition comprises phosphate ions, permanganate ions, at least one species of metal cation having a valence greater than +1, and water. The bonding composition has a pH in the range from about 1.5 to about 4.5 and is substantially free of chromate ions and molybdate ions. Preferably, the molar ratio of phosphate ions to permanganate ions in the bonding composition is in the range from about 2:1 to about 580:1 and the nonvolatile content of the bonding composition is in the range from about 10% (wt) to about 35% (wt). Aluminum ions are a preferred species of metal cation in the bonding composition. Overlay coating compositions are also provided containing metallic aluminum particles dispersed in the bonding composition of the invention.

Abstract: Aqueous liquid treatment compositions comprising as active ingredients boric acid and condensed phosphate ions can form iron phosphate containing conversion coatings on ferriferous substrates at rates of at least 0.3 g/m.sup.2 /min. The coatings are useful as cold working lubricants, either as such or after overcoating with a supplemental lubricant.

Abstract: The uniformity of gloss of a dried autodeposited resin film on a metal surface can be increased by rinsing the wet autodeposited film initially formed with an aqueous modifying rinse having a pH from 6 to 11 and comprising from 0.2 to 10.0 g/L in total of polymers of carboxylic acid monomers having an ethylenic double bond and salts thereof.

Abstract: Substantially improved hydrophilicity can be provided to a metal substrate, particularly an aluminum alloy of the type used for heat exchanger fins, that has been previously provided with a conventional chromium oxide conversion coating, by drying into place on the surface of the chromium oxide conversion coating an aqueous liquid hydrophilicizing treatment composition containing at least one of: (i) aproduct or products of reaction between dissolved phosphoric acid and at least one of elemental metal, metal oxides, and metal hydroxides in contact therewith; (ii) tungstate ions; and (iii) at least one of sulfate or molybdate ions together with polyethyleneimine. Most preferably, a solution formed by dissolving MgO in aqueous H.sub.3 PO.sub.4 in the proper stoichiometric amount to form an aqueous solution of Mg(H.sub.2 PO.sub.4).sub.2 with a pH of 4.5-5.5 is used for the hydrophilicizing treatment.

Abstract: The invention provides a non-chrome rinse and method for treating a phosphate conversion-coated ferrous metal substrate. The rinse comprising zirconium ions, vanadium ions, fluoride ions, and phosphate ions in a ratio and a concentration effective for providing the phosphate conversion-coated ferrous metal substrate with improved corrosion resistance.

Abstract: Concentrates containing (a) an hydroxylamine sulfate accelerator, and (b) zinc, nickel, manganese, and phosphate ions are formulated into aqueous coating solutions for treating metal surfaces, such as ferrous, zinc, and aluminum surfaces. In the process of using this solution, hydroxylamine ions become depleted or reduced in concentration in the applied solution. A replenishing solution is added for reusing the solution until the replenished coating solution reaches a sulfate level of no more than 14 g/l.

Abstract: The present invention relates to a surface treating dispersion for treating a surface of zinc or of an alloy of zinc and aluminum, the surface treating dispersion comprising an aqueous solution having a pH of below 3 and a complex formed from at least one species of metal oxo ion in conjunction with at least one species of hetero ion, the metal oxo ion being selected from the group consisting of molybdate, tungstate and vanadate, the hetero ion being selected from the group consisting of phosphorus (V), aluminum (III), silicon (IV), manganese (II), manganese (IV), zirconium (IV), titanium (IV), tin (IV), cerium (III) and nickel (II); and with a film forming acid tolerant resin compatible with the selected ions.

Abstract: A process for phosphating metal surfaces by treatment with an acidic zinc- and phosphathe-containing solution which does not require rinsing. The metal substrate is contacted with a phosphating solution containing 2 to 25 g/l of zinc ions, 2 to 25 g/l of manganese ions and 50 to 300 g/l of phosphate ions. The solution has a pH value of 1 to 3.6, a free acid content of 0 to 100 points, a total acid content of 40 to 400 points and a ratio of free acid to total acid of 1:4 to 1:20.

Abstract: A heat curable protective coating composition for providing barrier protection to a solid substrate. The coating composition comprises an aqueous solution of phosphate ions and nitrate ions and at least one species of metal ion having a valency greater than +1. The metal ions may be selected from the group consisting of aluminum ions, manganese ions, magnesium ions, cerium ions, cobalt ions, chromium(III) ions, nickel ions, iron ions, copper ions, and zinc ions. The composition has a pH in the range from about 0.5 to about 3.5. The composition is substantially free of chromate ions and molybdate ions. A cured topcoat is substantially clear and has a glossy appearance.

Abstract: A surface treatment aqueous solution is provided which is superior in corrosion resistance and coating adhesiveness as well as in ability of inhibiting the production of precipitate. A tinned DI can, which has been degreased, is conversion coating processed in a treatment bath filled with a surface treatment aqueous solution containing at least phosphate ions, organophosphonate compound and tin ions with a pH value of 5 or less. After the conversion coating, the DI can is washed with water and dried. A preferable organophosphonate compound is one in which a phosphorus atom constituting a phosphonate group is bonded to a carbon atom.

Abstract: A method is disclosed for applying phosphate coatings to surfaces of zinc, iron, aluminum, and the alloys thereof by wetting with a phosphatizing solution containing divalent cations and phosphate to form a liquid film, and subsequently drying on the liquid film wherein the metal surfaces are wetted with a phosphatizing solution, which is free from elements of sub-groups 5 and 6 of the Periodic Table, said phosphatizing solution containing:0.5 to 8 g/l nickel;2 to 20 g/l manganese;18 to 170 g/l of phosphate (calculated as P.sub.2 O.sub.5);and has an acid number of 0.4 to 0.8, such that after drying on, a phosphate layer having a weight per unit area of 0.3 to 3.0 g/m.sup.2, is obtained, where in the case of phosphatizing surfaces of iron, aluminum or the alloys thereof, the phosphatizing solution necessarily contains 0.5 to 5 g/l of zinc, and in the case of phosphatizing surfaces of zinc or zinc alloys the phosphatizing solution either contains zinc or is free from zinc.

Abstract: Equations have been developed to predict the amount of sludge formed during, and the values of several other characteristics of, zinc phosphating processes. Using these equations, novel compositions that achieve low sludge without sacrificing other characteristics of good zinc phosphate coatings have been discovered.

Abstract: The formation on the surface of Mg-containing metal of a highly corrosion-resistant, highly rust-inhibiting, and strongly paint-adherent conversion coating, using a chromic acid free treatment bath, is achieved by treatment with a pH 2.0-5.0 aqueous bath that contains phosphoric acid, manganese ion, and amine, thereby forming a conversion coating that contains P--Mn and Mn--N and/or other nitrogen compounds.

Abstract: A solution in water of fluorometallate and phosphate anions, divalent and/or trivalent metal cations, and polyhydroxylaminomethyl substituted polymers of vinyl phenol(s) provides an effective and economical post-rinse for conversion coatings, particularly predominantly zinc phosphate coatings that also contain manganese and may contain other cations.

Abstract: Described is a process using a no-rinse technique for the production of a chromium-free conversion layer on the surface of aluminum and its alloys by treating with an aqueous solution having a pH between 1 and 3.5 and containing titanium and/or zirconium plus an organic film-forming agent. The process is characterized in that the surface is brought into contact with a solution containing a) 2.2 to 22.0 g/l of Zr(IV) and/or 1.4 to 14.0 g/l of Ti(IV), b) 2.4 to 24.0 g/l of orthophosphate, c) 3.0 to 30.0 g/l of fluoride, d) 0.15 to 1.5 g/l of a water-soluble or homogeneously water-dispersible organic film former and, after a contact time between 1 and 40 seconds, the wet surface is allowed to dry, without rinsing, at a temperature between 50.degree. and 125.degree. C. Also described are aqueous concentrates for use in the process.

Abstract: A process for forming a zinc phosphate coating on an aluminum substrate is provided to obtain good coverage by the coating. The coating preferably has a columnar or nodular crystal morphology and a coating weight of at least about 150 mg/ft.sup.2. The aluminum substrate is contacted with a zinc phosphate conversion coating bath which contains: (a) from about 0.4 to 2.5 g/l zinc ion; (b) from about 5 to 26 g/l phosphate ion; (c) from about 0.4 to 1.5 g/l fluoride ion; (d) from about 4 to 400 mg/l ferrous ion; and (e) from about 0.01 to 2 g/l ammonium ion. The zinc phosphate conversion coating is formable on an aluminum substrate in the presence or absence of an accelerator. Also provided is an aqueous zinc phosphate conversion coating concentrate which contains: (a) from about 10 to 60 g/l zinc ion; (b) from about 160 to 400 g/l phosphate ion; (c) from about 2 to 40 g/l fluoride ion; (d) from about 0.2 to 2.0 g/l ferrous ion; and (e) from about 1.0 to 25 g/l ammonium ion.

Abstract: Disclosed is a method for zinc phosphating a molded metal article wherein a treating bath composition comprises from 1.5 to 5.0 g/l of zinc ion, from 0.1 to 3.0 g/l of manganese ion, from 5 to 40 g/l of phosphate ion, from 0.05 to 3.0 g/l of a fluorine compound as HF and hydoxylamine as a chemical conversion accelerator. A concentration of hydroxylamine is maintained to satisfy the following relationship:0.5.ltoreq.?hydroxylamine!(g/l)-2.0.times.?Fe.sup.2+ !(g/l).ltoreq.3.0 The treating bath is agitated by a vibratory agitating means provided in the treating vessel so that a mean acceleration a of a treating solution present within a bath region in which the molded metal article is immersed to be treated under fluid agitation is at least 8 cm/sec.sup.2. The mean acceleration is calculated from the following equation: ##EQU1## wherein values of X, Y and Z, each in unit of cm/sec.sup.

Abstract: A concentrated aqueous solution containing:(A) a component of dissolved phosphate ions;(B) a component of dissolved hexavalent chromium;(C) a component of dissolved anions selected from the group consisting of BF.sub.4.sup.-, AlF.sub.6.sup.-3, SiF.sub.6.sup.-2, TiF.sub.6.sup.-2, FeF.sub.6.sup.-3, SnF.sub.6.sup.-2, ZrF.sub.6.sup.-2, and HfF.sub.6.sup.

Abstract: An aqueous phosphoric bonding solution and coating composition slurry which are environmentally friendly in that they are generally free of molybdate or chromium. Yet the solution is stable with respect to inorganic metal particles, especially aluminum which are admixed to the bonding solution for the preparation of the coating slurry. The metal coated parts and the method of coating the parts with the coating composition are also described. The parts have very satisfactory properties.

Abstract: Disclosed is a process in which a phosphate layer is formed on a metal surface in preparation for the subsequent application of a vitreous enamel coating, wherein a phosphating solution is used which contains essentially nickel and/or cobalt as a layer-forming cation in amounts of 0.5 to 3 g/l as well as5 to 20 g/l phosphate (calculated as P.sub.2 O.sub.5),0.1 to 0.5 g/l molybdate (calculated as MoO.sub.3),0.2 to 2 g/l fluoride (calculated as F),1 to 10 g/l nitrate (calculated as NO.sub.3),and optionally also 0.1 to 5 g/l urea.It is particularly desirable to use essentially zinc-free phosphating solutions at temperatures preferably of 60.degree. to 70.degree. C. for 2 to 12 minutes to form a phosphate layer having a coating weight of 1.0 to 2.0 g/m.sup.2.

Abstract: An aqueous phosphoric bonding solution and coating composition slurry which are environmentally friendly in that they are generally free of molybdate or chromium. Yet the solution is stable with respect to inorganic metal particles, especially aluminum which are admixed to the bonding solution for the preparation of the coating slurry. The metal coated parts and the method of coating the parts with the coating composition are also described. The parts have very satisfactory properties.

Abstract: An acidic substitutional plating bath for zinciferous surfaces, particularly zinciferous metal-plated steel sheet, with which sludge production and equipment corrosion are inhibited and which has an improved heavy metal ion deposition efficiency is provided by an aqueous composition that has a pH of 2 to 4.5 and that contains 1.5 to 40 g/L of at least one heavy metal ion selected from nickel, iron, and cobalt; 0.5 to 10 g/L of phosphate ions; 1 to 250 g/L of sulfate ion; and 1 to 20 g/L of organic acid.

Abstract: A method and a treatment solution for posttreatment of an article with a metallic surface, where the metallic surface is made of one or more metals of a standard oxidation potential within the range -2.5 to +0.5 V. A thin coating is formed on the metallic surface by a treatment with an aqueous solution containing a molybdenum compound selected among molybdic acid and salts thereof in a concentration of 2.9 to 9.8 g/l calculated as molybdenum, as well as a compound capable of forming a heteropolymolydate, such as phosphoric acid, together with a molybdate. The treatment is performed under conditions where the metal surface is maintained at a potential within the range of -600 and -1800 mV/nhe. A corrosion-protecting and/or decorative effect is obtained which can be compared with the effect obtained by conventional chromate treatment, and which avoids the environmental and toxicologic drawbacks associated with the chromate treatment.

Abstract: A hydrophilic coating for aluminum comprising a substantially chromium-free treatment including phosphoric acid, boric acid and optionally molybdic acid.

Abstract: The present invention provides for forming an iron-phosphate conversion surface, or an iron-phosphate bi-metallic surface on metals, in situ, in internal combustion engines, pumps, hydraulic systems, compressors and other mechanical equipment and machinery, using the lubricating oil as the medium for bringing the phosphate and bi-metallic inorganic polymeric water complexes into contact with the metals in the machinery. The inorganic polymeric water complexes can be formed in accordance with U.S. Pat. Nos. 5,084,263 and 5,310,419 which are incorporated herein by reference. The bimetallic component can be any metal from Classes I through VIII of the Periodic Table. The phosphate and/or phosphate bi-metallic complexes are added to the lubricating oil while the engine is running.

Abstract: An anti corrosion treatment of an aluminium or aluminium alloy surface comprising the steps of treating the surface with a solution having a pH of from greater than 0 to less than 2 and comprising at least one metal oxo ion completed with phosphorus (V) wherein the metal oxo ion is vanadate or tungstate or a mixture thereof.

Abstract: To impart an excellent corrosion resistance and adherence to the surface of tinplate while avoiding the production of sludge in the treatment bath during continuous treatment, a bath is used that contains phosphate ions, from 0.1 to 5.0 g/L of chelating agent, and tin ions; has a pH from 2.0 to 4.5; is essentially free of oxidizing agent and ferric ion; and has an oxidation-reduction potential of .ltoreq.450 mV more oxidizing than a silver-saturated silver chloride reference electrode.

Abstract: The present invention relates to an improved titanium containing phosphate composition and a process for preparing the titanium containing phosphate composition. The composition in the form of a dilute aqueous dispersion is useful as a rinse conditioner for activating ferrous, zinc and aluminum metal surfaces prior to the application of phosphate conversion coatings. The rinse conditioner forms stable baths and can be used for activating metal surfaces for extended periods of time.

Abstract: This invention relates to conversion coating of metal substrates which may comprise mixed metals such as steel, zinc or zinc based alloys or zinc aluminium alloy coated steel, aluminium or aluminium surfaces to provide a corrosion resistant surface which is subsequently coated with a paint coating.The process of the invention comprises contacting the metal surface with an aqueous composition comprising silica, phosphoric acid and a divalent metal ion, the composition being substantially free of chromium and of any oxy metal anions which the metal has a valency of at least 5. The metal surface is subsequently cured by drying, or preferably by heating immediately after contact with the composition with no intermediate rinsing stage. A paint coating is then applied.The process provides a painted surface, the coating providing an effective anti-corrosion coating and paint having good adhesion.

Abstract: An aqueous phosphoric bonding solution and coating composition slurry which are environmentally friendly in that they are generally free of molybdate or chromium. Yet the solution is stable with respect to inorganic metal particles, especially aluminum which are admixed to the bonding solution for the preparation of the coating slurry. The metal coated parts and the method of coating the parts with the coating composition are also described. The parts have very satisfactory properties.

Abstract: (A.) A process for forming a cobalt conversion coating on a metal substrate, thereby imparting corrosion resistance and paint adhesion properties. The invention was developed as a replacement for the prior art chromic acid process. The process includes the steps of: (a) providing a cobalt conversion solution comprising an aqueous reaction solution containing a soluble cobalt-III hexacoordinated complex, the concentration of the cobalt-III hexacoordinated complex being from about 0.01 mole per liter of solution to the saturation limit of the cobalt-III hexacoordinated complex, and acetic acid; and (b) contacting the substrate with the aqueous solution solution for a sufficient amount of time, whereby the cobalt conversion coating is formed. The substrate may be aluminum or aluminum alloy, as well as Cd plating, Zn plating, Zn--Ni plating, and steel. The cobalt-III hexacoordinated complex may be present in the form of [Co(NH.sub.3).sub.6 ]X.sub.3 wherein X is Cl, Br, NO.sub.3, CN, SCN, 1/3PO.sub.4, 1/2SO.sub.

Abstract: The paint adhesion and corrosion resistance of surfaces of aluminum and its alloys, particularly when using a paint based on poly{vinyl chloride}, is improved by using a conversion coating solution having a pH in the range from 1.0 to 3.0 and consisting essentially of water and:(A) an amount of phosphate ions that is stoichiometrically equivalent to at least 5.0 g/L of phosphoric acid;(B) at least 1.0 g/L of hexavalent chromium;(C) at least 0.1 g/L of fluoride ions; and(D) a complex fluoride ion component selected from the group consisting of:(i) at least 4.0 g/L of fluosilicate ions,(ii) at least 0.5 g/L of fluoborate ions,(iii) at least 2.0 g/L of fluozirconate ions, and(iv) at least 2.0 g/L of fluotitanate ions.

Abstract: A process of producing a phosphate coating on a metal surface of iron or steel by contacting the surface with an aqueous phosphating solution on the basis of magnesium phosphate. The solution contains 0.2 to 4 g/l magnesium, 1 to 20 g/l phosphate (calculated as P.sub.2 O.sub.5) and a peroxide compound as an accelerator. The phosphating solution is free of inorganic substances which are not precipitable with calcium hydroxide in a neutral or alkaline medium. It is preferred to use phosphating solutions which also contain activators, which are precipitable with calcium hydroxide in a neutral or alkaline medium.

Abstract: The following water soluble materials are all satisfactory internal accelerators for otherwise conventional zinc phosphate conversion coating solutions: reducing sugars, starch, urea, and poly{acrylates and methacrylates}. Concentrates including these ingredients and otherwise conventional constituents of zinc phosphate conversion coating compositions, except for excluding conventional accelerators other than nitrate, are stable in composition during storage, unlike most conversion coating compositions containing conventional accelerators. Thus concentrates according to the invention are practical single-package concentrates that can be made into working phosphating compositions by dilution with water only.

Abstract: Drying into place a covering of an aqueous solution of nickel and/or cobaltous sulfate and/or phosphate salts on a zinc or zinc alloy surface improves at least one of the blackening resistance and corrosion resistance after subsequent chromating treatment and the corrosion resistance and paint adherence after subsequent chromating treatment and painting.

Abstract: A substantially chromium free composition and method for passivating a galvanized metal surface is disclosed. The passivation treatment which may be rinsed or dried-in-place includes phosphoric acid, boric acid and optionally molybdic acid.

Abstract: A coating composition comprises a slurry consisting essentially of an aluminum neutralized phosphate bonding solution and aluminum powder. The bonding solution advantageously contains a relatively small but essential amount of vanadium pentoxide and, preferably, magnesium. A process for forming the bonding solution component of the coating slurry includes equilibrating an aqueous phosphate solution with a small but controlled and necessary amount of solute aluminum prior to adding aluminum powder to form the slurry. The present invention overcomes the problem of bonding solutions which require environmentally disadvantageous chromates or molybdates.

Abstract: A seal coat composition comprises a slurry consisting essentially of an aluminum neutralized phosphate bonding solution and iron oxide (Fe.sub.2 O.sub.3) powder. The bonding solution advantageously contains a relatively small but essential amount of vanadium pentoxide and, preferably, magnesium. A process for forming the bonding solution component of the coating slurry includes equilibrating an aqueous phosphate solution with a small but controlled and necessary amount of solute aluminum prior to adding iron oxide powder to form the slurry. The present invention overcomes the problem of bonding solutions which require environmentally disadvantageous chromates or molybdates to neutralize the bonding solution prior to formation of the slurry.

Abstract: Improved tellurium-containing coating compositions and a method for applying a tellurium-containing coating to a metallic surface characterized by the presence of tellurium and an organic acid solubilizing agent.

Abstract: Surfaces of structural components made of aluminum or aluminum alloys are chemically treated to produce an aluminum oxide coating for improved adhesive bonding to other components or to other surface layers. The oxidizing is accomplished by exposing the surface to be oxidized to a combination bath of an inorganic mineral acid and an oxidation medium for a specific time duration, so that an oxide coating is produced on the surface of the structural components, as a prerequisite for a good adhesion stability of adhesive bonds to be formed after oxidizing.

Abstract: Compositions and method for applying a coating to a metallic surface characterized by the presence of tellurium and/or selenium.