Abstract: A sealing process includes impregnating an oxide layer of an anodized metal with a corrosion inhibitor by contacting the oxide layer with a first corrosion inhibitor solution at a first temperature and sealing the impregnated oxide layer of an anodized metal by contacting the impregnated oxide layer with a second corrosion inhibitor solution at a second temperature, wherein the first corrosion inhibitor solution has a corrosion inhibitor concentration greater than the second corrosion inhibitor solution and the first temperature is less than the second temperature.

Abstract: The present invention relates to a method for providing electrically insulating and anti-corrosive coatings on electrical steel strip by using a phosphate-free aqueous dispersion. Furthermore, the invention relates to such an aqueous dispersion which is particularly suitable for providing electrically insulating and anti-corrosive coatings on electrical steel strip. The aqueous dispersion of the present invention is substantially free of phosphates and organic compounds and comprises silicates dissolved in water as an inorganic binder which forms the coating, and a mixture of oxide pigments of the elements titanium and aluminum. The subject matter of the invention also comprises a laminated electrical steel strip which is made from the electrical steel strip produced in the method according to the invention or from electrical steel strip coated with an aqueous dispersion according to the invention.

Abstract: A black plated resin part includes a resin base material, an underlying plating layer including a copper plating layer and a nickel plating layer formed in this order on the resin base material, a black chromium plating layer formed on the nickel plating layer, formed of trivalent chromium, and having a film thickness of not less than 0.15 ?m, and a corrosion resistant film formed on the black chromium plating layer, formed of chromic phosphate or molybdenum phosphate, and having a film thickness of not less than 7 nm. A brightness of the black chromium plating layer seen through the corrosion resistant film is expressed by an L* value of not more than 54 based on the L*a*b* color system.

Abstract: A manufacturing method for steel sheets for containers produces steel sheets with excellent film adhesion qualities. This steel sheet for containers has, on a steel sheet, a chemical conversion coating with a metal Zr content of 1-100 mg/m2, a P content of 0.1-50 mg/m2, and an F content of no more than 0.1 mg/m2, upon which is formed a phenolic resin layer with a C content of 0.1-50 mg/m2. Moreover, the manufacturing method for steel sheets for containers is a method for obtaining the steel sheet for containers wherein the chemical conversion coating is formed on the steel sheet by subjecting the steel sheet to immersion in or electrolytic treatment with a treatment solution containing Zr ions, phosphoric acid ions, and F ions; and subsequently, the steel sheet upon which the chemical conversion coating has been formed is immersed in, or undergoes topical application of, an aqueous solution containing phenolic resin, then dried.

Abstract: A chemical conversion treatment liquid which can stably form a phosphate-type chemical conversion film on a steel material for a joint portion of an oil well steel pipe containing 0.5-13% Cr is developed. Using a chemical conversion treatment liquid to which a prescribed amount of potassium is added, a chemical conversion film containing a prescribed amount of potassium compounds and having a prescribed thickness can be formed on the threaded surface of a joint portion of an oil well steel pipe.

Abstract: A surface treatment with a zirconium ion that enables sufficient throwing power and superior anti-corrosion properties to be exhibited when thus surface treated metal base material is subjected to cation electrodeposition coating is provided. A metal surface treatment liquid thereof for cation electrodeposition coating includes zirconium ions, copper ions, and other metal ions, and having a pH of 1.5 to 6.5, in which: the other metal ions are at least one selected from the group consisting of tin ions, indium ions, aluminum ions, niobium ions, tantalum ions, yttrium ions and cerium ions; the concentration of zirconium ions is 10 to 10,000 ppm; the concentration ratio of the copper ions to the zirconium ions is 0.005 to 1 on a mass basis; and the concentration ratio of the other metal ions to the copper ions is 0.1 to 1,000 on a mass basis.

Abstract: An aqueous phosphoric bonding solution consists essentially of phosphoric acid, a source of magnesium ions, and a leachable corrosion inhibitor. The bonding solution is stable with respect to inorganic metal particles, such as aluminum, which are admixed to the bonding solution for the preparation of a coating slurry. Metal parts coated with the coating compositions have very satisfactory properties such as heat and corrosion resistance.

Abstract: Compositions and methods are described for inhibiting corrosion of corrodible metals present in contact with water in cooling water and other water storage systems. The compositions include concentrated stannous salts and agents to solubilize such salts.

Abstract: The invention provides a method and composition for coating a ferrous metal surface with a zirconium/vanadium conversion coating which is substantially free of an organic film forming composition and tannins. The method is a low temperature method which contemplates an aqueous conversion coating composition which is low in phosphates and which comprises zirconium, vanadium, fluoride, as well as phosphate ions in a ratio and a concentration effective for providing a conversion-coated ferrous metal surface.

Abstract: An aqueous phosphoric bonding solution consists essentially of phosphoric acid, a source of magnesium ions, and a leachable corrosion inhibitor. The bonding solution is stable with respect to inorganic metal particles, such as aluminum, which are admixed to the bonding solution for the preparation of a coating slurry. Metal parts coated with the coating compositions have very satisfactory properties such as heat and corrosion resistance.

Abstract: A treatment solution for insulation coating for grain oriented electrical steel sheet includes at least one member selected from phosphates of Mg, Ca, Ba, Sr, Zn, Al, and Mn, and colloidal silica in a proportion of 0.2 to 10 mol in terms of SiO2 and a titanium chelate compound in a proportion of 0.01 to 4.0 mol in terms of Ti, relative to PO4: 1 mol in the phosphates.

Abstract: A corrosion-inhibiting coating, process, and system that provides a tight, adherent zinc- or zinc-alloy coating that is directly deposited onto steel or cast iron surfaces for enhanced corrosion protection. A process for applying the coating is also provided. The process includes the application of two sequential aqueous baths. The first bath contains a precursor zinc compound while the second bath contains a reducing agent to deposit the zinc directly upon the steel or cast iron.

Abstract: An aqueous composition for pretreating and depositing a coating on metal substrates is provided. The coating composition includes from about 1,500 to about 55,000 ppm based on the aqueous composition of a Group IIA dissolved metal ion, from about 100 to about 200,000 ppm based on the aqueous composition of a dissolved complex metal fluoride ion wherein the metal atom is selected from Group IIIA, Group IVA, Group IVB metals, Group VA, Group VB metals; and water. The composition is free of Group IIA metal fluoride precipitate achieved by including in the composition a complex metal salt different than the salt associated with the complex metal fluoride ion, with the complex metal salt being capable of complexing free fluoride ions to prevent a precipitation reaction. A process for coating a metal substrate with such an aqueous composition is further provided.

Abstract: A method of surface-treating a metal member involves heating, or heating under pressure, the metal member in an aqueous alkaline solution having a pH of 9 or more and containing a manganese compound and a chelating agent dissolved in water, whereby a mold release agent or dirt is removed from the metal member without any pre-cleaning process. The surface treatment forms on the metal member a surface treatment layer providing excellent corrosion resistance. Paint, which adheres well to the surface treatment layer, can provide additional corrosion protection.

Abstract: A non-carcinogenic corrosion inhibiting additive includes an anodic corrosion inhibitor and/or a cathodic corrosion inhibitor and a solubility enhancer for the inhibitors in the form of a metal complexing agent.

Abstract: A process for increasing the adhesion between a copper or copper alloy surface and a polymeric material is disclosed. The process comprises treating the copper or copper alloy surface with an aqueous solution of cupric ions at a pH from 2.8 to 4.2 to form an oxide conversion coating on the copper or copper alloy surface. The so treated surface can then be bonded to the polymeric material.

Abstract: An aqueous solution for depositing an inorganic corrosion resistant coating on a metal substrate is disclosed. The aqueous solution comprises a film-forming agent, a supplemental anion, and a substrate activator. The film-forming agent is a vanadate salt that forms the corrosion resistant coating. The supplemental anion accelerates the rate at which the corrosion resistant coating is formed. The substrate activator serves to remove any existing oxides from the metal substrate prior to the formation of the corrosion resistant coating. The present invention additionally covers objects so coated and methods of application.

Abstract: A cerium-based coating for corrosion resistance is applied by exposing a cleaned aluminum-based component to a corrosion-inhibiting cerium solution containing cerium ions in the presence of an oxidizing agent. The coating deposits spontaneously without an external source of electrons.

Abstract: A plating solution containing zinc, an electrically conductive salt, an adsorbent, and at least one of mono- to hexavalent metal ions. A treatment using either a solution which contains, all per liter, 2–60 g Zn, 40–300 g caustic alkali, 0.01–50 g adsorbent, 0.002–10 g Fe, 0.002–10 g Co, 0.05–30 g Mn, 0.001–2 g Cu, 0.005–10 g Ni, 0.002–3 g of at least one chosen from among Mo, W, V, Ti, Al, Ca, Ba, and Sn, and 0.01–30 g aliphatic amine or aliphatic amine polymer or a solution which contains, all per liter, 2–40 g Zn, 40–170 g caustic alkali, 0.01–50 g adsorbent, either 0.001–3 g Fe and 0.001–3 g Co or 0.005–5 g Fe and 0.005–5 g Ni, and 0.01–30 g aliphatic amine or aliphatic amine polymer.

Abstract: An insulation film whose requisite constituent elements are first elements and a second element. The first elements include B, P, O and Fe. The second element can generate cations whose hexa-coordinated ion radius, defined by Shannon, R. D., is 0.073 nm or more, and which are bivalent or more. Since the second element having a large ion radius is incorporated into network formers made from the first elements, it is possible to improve the heat resistance of the insulation film.

Abstract: The present invention relates to a process for forming a chromate-free, corrosion resistant coating on a product formed from magnesium or a magnesium alloy and to a solution used for forming the coating. The solution has phosphate and fluoride ions and contains from 1.0 g/l to 5.0 g/l of an active corrosion inhibitor selected from the group consisting potassium permanganate, sodium tungstate, sodium vanadate, and mixtures thereof. The solution may also containing from 0.1 to 1.0 vol % of a surfactant which reduces reaction time. The solution is maintained at a temperature of 120 to 200 degrees Fahrenheit and has a pH of 5 to 7. The process for forming the coating broadly comprises degreasing the magnesium or magnesium alloy product in a degreasing solution, cleaning the product in a highly alkaline cleaning solution, deoxidizing the product in a deoxidizing solution, and immersing the product in the coating solution for a time period of 15 minutes to 90 minutes.

Abstract: The chemical conversion film containing, at least as the constituent components thereof, (a) at least one of the metals selected from molybdenum, zirconium, vanadium, and tungsten; (b) a rare earth metal constituting the magnet; and (c) oxygen, which is formed on the surface of a rare earth metal-based permanent magnet according to the present invention, contains a composite metal oxide provided on the surface of the R-rich phase having a lower oxidation-reduction potential through a preferential reaction of the metallic ions that are present in the form of complex ions or oxide ions, such as of molybdenum, contained in the treatment solution, with the rare earth metals that elute from the magnet. Thus formed composite metal oxide reduces the difference in corrosion potential as to realize a uniform surface potential, and effectively suppresses the corrosion based on potential difference.

Abstract: The present invention provides a conversion coating solution containing polymetalates and/or heteropolymetalates to oxidize the surface of various metal substrates. The polymetalates have the general formula MxOyn?, where M is selected from the group comprising Mo, V and W. The heteropolymetalates have the general formula BMxOyn?, where B is a heteroatom selected from P, Si, Ce, Mn or Co, and M is again selected from Mo, V, W or combinations thereof. The concentration of polymetalates and/or heteropolymetalates anions is preferably between about 1% and about 5% by weight. Examples of typical anions used include, but are not limited to, (PMo12O40)3?, (PMo10V2O40)5?, (MnPW11O39)5?, (PW12O40)3?, (SiMo12O40)4?, (SiW12O40)4?, (Mo7O24)6?, (CeMo12O42)8? and mixtures thereof.

Abstract: Excellent adhesion to subsequently applied paint or elastomer is obtained by coating a metal substrate with a phosphate conversion coating by contact with a liquid phosphating solution that contains zinc cations, phosphate anions, and at least one adhesion promoter selected from (i) film-forming organic substances, (ii) polymers of vinyl phenols modified by substitution of substituted aminomethyl moieties on their aromatic rings, (iii) inorganic oxides of one of the elements silicon, aluminum, titanium, and zirconium. Preferably, the phosphating solution also contains manganese and nickel cations and either iron cations or hydroxylamine. If adhesion to paint is desired, the adhesion promoter preferably is an acrylic film-forming substance, while if adhesion to elastomers is desired, the adhesion promoter preferably is a polymer of vinyl phenol and the phosphating solution preferably also contains calcium cations.

Abstract: A corrosion-inhibiting coating, process, and system that provides a tight, adherent zinc- or zinc-alloy coating that is directly deposited onto steel or cast iron surfaces for enhanced corrosion protection. A process for applying the coating is also provided. The process includes the application of two sequential aqueous baths. The first bath contains a precursor zinc compound while the second bath contains a reducing agent to deposit the zinc directly upon the steel or cast iron.

Abstract: An aqueous solution and method for applying the solution to a metal surface form a zinc phosphate coating on the metal surface. The zinc phosphate coating minimizes corrosion and improves adhesion of subsequently coated materials such as sealants and paints. The solution of the composition and method of application consume free acidity otherwise left on the metal surface, and obviate the need for subsequent rinsing or extensive drying or stoving operations. The composition includes an aqueous solution including water, a zinc source, phosphoric acid, a polyhydric compound (preferably pentaerythritol), a metal salt, and optionally, an oxidizer.

Abstract: A chemical conversion treatment liquid which can stably form a phosphate-type chemical conversion film on a steel material for a joint portion of an oil well steel pipe containing 0.5-13% Cr is developed. Using a chemical conversion treatment liquid to which a prescribed amount of potassium is added, a chemical conversion film containing a prescribed amount of potassium compounds and having a prescribed thickness can be formed on the threaded surface of a joint portion of an oil well steel pipe.

Abstract: The aim of the present invention is to provide a phosphate treated zinc coated steel sheet with excellent workability. A steel sheet coated with a zinc based alloy has a phosphate treated coating on the surface thereof. The phosphate treated coating comprises mainly granulated crystals, specifically, crystals in which the average ratio of the major axis to the minor axis is not less than 1.00 and not more than 2.90. Moreover, the method for producing the phosphate treated coating uses a phosphate treatment solution in which the amount of Mg ions is ≧6 g/l and the amount of Zn ions is ≧0.5 g/l, or a phosphate treatment solution in which the amount of Mg ions is ≧10 g/l, the amount of Zn ions is 0≦ and <0.5 g/l, and the amount of nitric acid ions is ≧40 g/l.

Abstract: A chromium-free corrosion inhibiting coating composition, which does not utilize harmful chromium compounds and can be used for corrosion inhibition of a metal surface, comprising a slurry mixture in which coated aluminum fine powder treated with a hydrophilic coupling agent is suspended in an acidic phosphate bonding solution and which can be stored in a refrigerator, is disclosed. A titanium-coupling agent is preferable to use as the coupling agent, which treats a surface of the aluminum fine powder. In this aqueous chromium-free corrosion inhibiting coating composition, 25 to 40% by weight of the aluminum fine powder a surface of which is treated with the coupling agent is suspended in the acidic phosphate bonding solution.

Abstract: A conversion coating composition and a method of applying the conversion coating composition to magnesium and magnesium alloy articles prior to painting to prevent corrosion. The conversion coating composition comprises a source of vanadate ions, a material comprising phosphorus, and nitric acid or a source of nitrate ions. In addition, the composition may also contain boric acid or a source of borate ions and a source of fluoride ions or a source of fluoroborate ions.

Abstract: A surface treated tin-plated steel sheet which has an alloy layer formed on the surface of a steel sheet, a tin plating layer being formed on said alloy layer with a remaining exposed portion of the alloy layer having an area of 30% or more of that of the alloy layer and, formed on said tin plating layer and said exposed portion of the alloy layer, a coating film containing P and Si in an amount of 0.5 to 100 mg/m2 and 0.1 to 250 mg/m2, respectively; and a chemical treatment solution for use in preparing the steel sheet which comprises a phosphate ion, a tin ion and a silane coupling agent and has a pH of 1.5 to 5.5. The surface treated tin-plated steel sheet is free from chromium which causes problems from an environmental view point, and also is excellent in adhesion with a paint, corrosion resistance after being coated, rust resistance, and formability.

Abstract: Disclosed are processes and compositions of solutions for chromate-replacement coatings for aluminum and aluminum alloys. A preferred method includes forming a boehmite coating layer that includes Al (III) ions on an aluminum surface, and applying an ionic conversion coating solution to the coating layer. The ionic conversion coating solution comprises hexavalent and trivalent ions. The trivalent ions are selected from the group consisting of Ce, Ga, Mn, Sc, Ti, Te and V. The hexavalent ions are selected from the group consisting of Mn, Mo, Se and W. It is contended that the resulting coatings provide corrosion resistance and self-healing effect in any defects present in the coatings.

Abstract: Rinsing or sealing solutions based on cobalt are described for barrier films such as anodic coatings, phosphate coatings, or “black oxide” coatings. The treated films contain a trivalent or tetravalent cobalt/valence stabilizer complex. The rinsing or sealing bath may also contain an optional preparative agent or an optional solubility control agent. The oxidized cobalt is present in the coating in a “sparingly soluble” form. The valence stabilizers can be either inorganic or organic in nature. Cobalt/valence stabilizer combinations are chosen based on the well-founded principles of cobalt coordination chemistry. A number of cobalt/valence stabilizer combinations that match the performance of conventional hexavalent chromium systems are presented.

Abstract: The phosphate concentration, and therefore the pollution potential, of conventional high quality phosphating compositions containing zinc, manganese, and, optionally, nickel or copper cations, can be reduced without loss of corrosion protective value of the phosphate coatings formed by maintaining concentrations of active ingredients within prescribed ranges. Under the most preferred conditions, the corrosion resistance of phosphated and then painted cold rolled steel and the paint adhesion to phosphated and then painted electrogalvanized steel are improved over values obtained with the now most commonly used commercial high quality low zinc phosphating processes.

Abstract: A conversion coating composition and a method of applying the conversion coating composition to magnesium and magnesium alloy articles prior to painting to prevent corrosion. The conversion coating composition comprises a source of vanadate ions, a material comprising phosphorus, and nitric acid or a source of nitrate ions. In addition, the composition may also contain boric acid or a source of borate ions and a source of fluoride ions or a source of fluoroborate ions.

Abstract: The present invention provides a conversion coating solution containing polymetalates and/or heteropolymetalates to oxidize the surface of various metal substrates. The polymetalates have the general formula MxOyn−, where M is selected from the group comprising Mo, V and W. The heteropolymetalates have the general formula BMxOyn−, where B is a heteroatom selected from P, Si, Ce, Mn or Co, and M is again selected from Mo, V, W or combinations thereof. The concentration of polymetalates and/or heteropolymetalates anions is preferably between about 1% and about 5% by weight. Examples of typical anions used include, but are not limited to, (PMo12O40)3−, (PMo10V2O40)5−, (MnPW11O39)5−, (PW12O40)3−, (SiMo12O40)4−, (SiW12O40)4−, (Mo7O24)6−, (CeMo12O42)8−and mixtures thereof.

Abstract: A non-chromate protective coating and coating solution useful for coating iron and iron alloys, particularly steel, includes V2O5, Ce2(MoO4)3 or SrWO4 as a corrosion inhibitive component

Abstract: Tri-cation zinc phosphate conversion coating compositions are disclosed. The compositions include a phosphate component, ions of nickel, manganese, and zinc, and a glycerophosphate component, such as disodium glycerophosphate. Coatings formed from these compositions provide improved corrosion resistance to metal substrates and provide a uniform layer for the application of paint finishes. Processes of making and using these compositions are also disclosed.

Abstract: Phosphate conversion coatings having very fine crystal size are obtained using liquid compositions containing phosphate, zinc cations and relatively low concentrations of Co, Ni and Mn.

Abstract: Disclosed is a process for the production of Zintl compounds by thermal decomposition of heterometallic phosphinidene complexes. The heterometallic phosphinidene complex typically comprises at least two metals, at least one of which is selected from a Group I metal, M1, and another being a metal M2, selected from Group 13, 14 or 15 of the Periodic Table. The heterometallic phosphinidene complex further comprises one or more phosphinidene ligands, [PR], wherein R is typically a substituted or unsubstituted hydrocarbyl group, and a Lewis base stabilizing ligand. Thermal decomposition of the heterometallic phosphinidene complexes in accordance with the invention forms a Zintl compound comprising metals M1 and M2 coordinated to Lewis base stabilizing ligands, Lg. The invention further provides a process for removal of the stabilizing ligand from the Zintl compounds to form an intermetallic compound.

Abstract: The present invention provides a conversion coating solution containing polymetalates and/or heteropolymetalates to oxidize the surface of various metal substrates. The polymetalates have the general formula MxOyn−, where M is selected from the group comprising Mo, V and W. The heteropolymetalates have the general formula BMxOyn−, where B is a heteroatom selected from P, Si, Ce, Mn or Co, and M is again selected from Mo, V, W or combinations thereof. The concentration of polymetalates and/or heteropolymetalates anions is preferably between about 1% and about 5% by weight. Examples of typical anions used include, but are not limited to, (PMo12O40)3−, (PMo10V2O40)5−, (MnPW11O39)5−, (PW12O40)3−, (SiMo12O40)4−, (SiW12O40)4−, (Mo7O24)6−, (CeMo7O24)8−and mixtures thereof.

Abstract: An anticorrosion treatment of an aluminium/zinc alloy surface is disclosed. The treatment includes the steps of forming on the alloy surface a coating of a solution which contain 5-40 grams of molybdenum per litre of the solution, 2-19% by volume of a phosphoric acid, and a surface etchant. The treatment also includes drying the coating to form a dried coating having a loading of molybdenum of at least 10 mg/m2 of the dried coating and of phosphorus of at least 15 mg/m2 of the dried coating.

Abstract: A process for the production of a rubber-to-metal bond on steel, galvanized steel, aluminum and/or magnesium is provided The process comprises at least the following steps: a) chemical pretreatment of the metal parts, b) intermediate rinsing, and c) vulcanizing-on of natural or synthetic rubber using primers and/or binders. The chemical pretreatment in step a) is carried out with an aqueous solution with a pH value of 3.5 to 5.5 which contains: 4 to 20 g/l of phosphate ions, 0.1 to 1 g/l of free or complexed fluoride, and 0.04 to 1 g/l of nitrate ions.

Abstract: An article of magnesium or its alloy having a surface layer containing magnesium condensed phosphate and magnesium phosphate, which can be produced by treating an article of magnesium or its alloy with a treating liquid containing 1,000 to 20,000 ppm of alkaline metal ions, 1,000 to 50,000 ppm of condensed phosphate ions, and 100 to 20,000 ppm of borate ions, and having pH of at least 8. The treated article has good corrosion resistance, and a coating can be formed on the surface of the article with good adhesion.

Abstract: A process for phosphating metal surfaces in which a nitrite- and nickel-free zinc-containing phosphating solution is applied to the metal surfaces which, if desired, are then rinsed and subsequently after-rinsed with an aqueous solution with a pH value of 3 to 7 which contains 0.001 to 10 g/l of one or more of the cations of Li, Cu and Ag.

Abstract: The present invention has an object to provide a surface-treated steel sheet which has highly balanced corrosion resistance and formability, and satisfies fundamental properties required mainly for steel sheets for automobile body, and a manufacturing method thereof. The surface-treated steel sheet of the invention is excellent in corrosion resistance and formability, comprising an amorphous inorganic film containing at least 5% magnesium and having a weight within a range of from 0.1 to 2.0 g/m2, formed on the surface of a zinc or zinc alloy plated steel sheet; wherein the inorganic film is soluble in an acidic solution and hardly soluble in a neutral or alkaline solution, and a manufacturing method thereof is provided. A zinc phosphate film may be provided between the galvanized steel sheet and the amorphous inorganic film.

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: A heat curable bonding composition for providing a coating to a solid substrate comprises water, phosphate ions, borate ions, and aluminum ions. The bonding composition has a pH in the range from about 1.4 to about 2.2, and is substantially free of chromate ions, molybdate ions, and magnesium ions.

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 composition and method for coating and touching up a metal surface is provided. The composition contains from about 0.5 to about 240 millimoles per kilogram of a fluorometallate ion, from about 0.5 grams/liters to about 10 grams/liter of phosphorous-containing inorganic oxy anions calculated at their stoichiometric equivalent as H3PO4; from about 0.05 g/l to about 3.5 g/l of hexavalent chromium and from about 0.10 g/l to about 2.20 g/l of trivalent chromium ions and a surfactant.