Abstract: Chromium free cleaning compositions for cleaning aluminum and aluminum alloy surfaces comprisingA. from 0.2-4 g/l ferric ion andB. sufficient sulfuric and/or nitric acid to produce a pH of 2 or less.The invention also relates to compositions containing from 0.001-0.5 g/l of fluoride ions.

Abstract: In chromium-free aqueous acidic washing solutions for cleaning the surfaces of aluminum and aluminum-alloy particles, so as to remove therefrom smut and lubricating oil left on the surfaces thereof after metal forming operations, which solutions contain from 0.2 to 4 g/l ferric ion and sufficient sulfuric and/or nitric acid to impart a pH of 2 or less to the solutionh (and which optionally may also contain fluoride ions up to a concentration of 0.5 g/l) there is provided a method of controlling the effectiveness of the washing solution in which the ferric ion concentration therein is monitored, conveniently by the oxidation-reduction potential of the washing solution, as shown in FIG. 3, and is controlled within the desired limits by adding when appropriate suitable amounts of oxidant capable of oxidizing ferrous ions to ferric ions and, separately or in conjunction therewith, a replenisher containing a source of iron ions.

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 process of enhancing the gloss and retaining the corrosion resistance of an autodeposited coating on a metallic surface by contacting the coating with a reaction rinse solution containing an amphoteric surface active agent and an alkaline material, and then rinsing the coating, preferably with deionized water. The coating preferably comprises a vinylidene chloride copolymer, and the metallic surface preferbly comprises a ferriferrous surface.

Abstract: This invention relates to a process for sealing an anodized aluminum surface by contacting the surface with an aqueous acidic sealing solution having dissolved therein zirconium and/or titanium and dissolved fluoride, said solution preferably including dissolved silicate and/or a dissolved thiourea compound, and including optionally a sealing auxiliary, the process being carried out at a temperature of no greater than about 40.degree. C.

Abstract: Corrosion inhibiting compositions for addition to aqueous acid metal cleaning compositions for use in the cleaning of surfaces of metal parts which are contaminated with water insoluble, acid soluble deposits, wherein the corrosion inhibiting composition contains a partially hydrolyzed protein which is either a partially hydrolyzed gelatin, a partially hydrolyzed casein or a mixture thereof wherein the partially hydrolyzed protein has a total nitrogen content of from about 10 to about 20% by weight and a free amino group nitrogen content of from about 4 to about 30% based on the total nitrogen content. The invention also relates to aqueous acid solutions containing the corrosion inhibitor of the invention and to processes for treating contaminated metal parts with such acid compositions.

Abstract: A cleaning composition bath, concentrate for its preparation, and method of use of an aqueous alkaline cleaner comprising an ethylenediaminetetraacetic acid or nitrilotriacetic acid alkali metal salt, an inorganic alkali metal phosphate, a surfactant and optionally an aluminum sequestrant, other inorganic salts and an alkali metal hydroxide, if needed, to adjust the pH of the composition to at least 11.0.

Abstract: An aqueous autodepositing coating composition for coating metallic surfaces comprising resin, persulfate and, optionally, fluoride, which is effective in coating at a pH of about 4 to about 8.5.

Abstract: A degreasing detergent composition for tin surfaces and a method for its use, wherein the composition is an aqueous solution having a pH of 9 to 13 and containing at least one surfactant, at least one alkali metal detergent builder, and at least an alkaline earth metal salt at a concentration of at least 0.003 g/l.

Abstract: An activator composition having increased effectiveness and life when used in an aqueous alkaline stripper solution at elevated temperatures to remove siccative coatings from substrates containing two essential components A and B. Component A consists essentially of at least one of an ethoxylated tetrahydrofurfuryl, a mixture of an ethoxylated tetrahydrofurfuryl and an ethoxylated furfuryl, N-methyl-2-pyrrolidone and N-(2-hydroxyethyl)-2-pyrrolidine. Component B consists essentially of at least one of N-phenyl-diethanolamine, furfurylamine, tetrahydrofurfurylamine, octadecylamine, butoxypropanolamine and N-amino-morpholine.

Abstract: Chromium free cleaning compositions for cleaning aluminum and aluminum alloy surfaces comprisingA. from 0.2-4 g/l ferric ion andB. sufficient sulfuric and/or nitric acid to produce a pH of 2 or less.The invention also relates to compositions containing from 0.001-0.5 g/l of fluoride ions.

Abstract: A detergent degreasing composition for DI-process tin-plated cans, comprising an alkali metal or ammonium salt of orthophosphoric acid, an alkali metal salt of nitrous acid, an optional surfactant, sufficient of at least one alkali metal salt of carbonic acid to adjust the pH to 9 to 11, and water.

Abstract: Nickel-free aqueous phosphating compositions containing zinc ions, cobalt ions, phosphate ions, and at least two additional cations; methods for using such composition, and products of the methods.

Abstract: A chemical treatment for the removal for manganese or manganese and fluoride from an aqueous waste effluent obtained from the acid-fluoride washing or alkali (non-fluoride) washing in a step in the manufacture of aluminum cans. The treatment consists of adding in an acid medium sufficient phosphate ion to react with the manganese and/or fluoride and thereafter adding in an alkali medium sufficient calcium ion to react with the manganese, phosphate and/or fluoride. The ratio of phosphate to calcium ion added is 3:1 to 1:2.5.

Abstract: Compositions and methods for cleaning aluminum surfaces wherein the cleaning compositions contain sulfuric acid, phosphoric acid, and at least one surfactant.

Abstract: The life of chromium phosphate coating baths is extended by at least fully restoring depleted Cr.sup.VI ; bath efficiencies are significantly improved.

Abstract: A method for stabilizing the iron salt content of a PVDC latex autodeposition bath by: filtering a metered portion of the bath to separate it into a filtrate containing the iron salts and a retentate containing the latex and pigment particles; discarding the filtrate; recycling the retentate back into the bath; and adding D.I. water in a volume equal to that of the filtrate.

Abstract: Curing of autodeposited coatings by treatment with water or steam including a solute.

Abstract: Aqueous compositions and low temperature processes for treating clean steel and galvanized steel to provide a coating suitable for the application of paint thereto. The aqueous treating compositions contain:______________________________________ Ingredient Quantity ______________________________________ zinc ion from about 0.9 to about 2.5 g/l; nickel ion from about 0.6 to about 2.0 g/l; orthophosphoric acid from about 15 to about 45 g/l; nitrate ion from about 1.0 to about 10.0 g/l. ______________________________________The pH of the composition is adjusted to 3.0-3.5 by addition of alkali metal hydroxide. The above composition is used on clean galvanized steel. For clean ungalvanized steel, from about 0.10 to about 0.65 g/l of nitrite ion is included in the composition. Optional ingredients in the above compositions include chlorate ion, ferric ion, and a fluoride compound.

Abstract: Acid cleaning of aluminum surfaces is accomplished employing a composition comprising hydrofluoric acid and sulfuric acid. More specifically, this invention relates to a composition and method for treating aluminum containers at low temperatures.