Abstract: A trivalent chromium protective coating composition for zinc or a zinc plated article having an acid pH of about 3.0 to 4.0 and a process for coating the zinc or zinc plated article in which the article is contacted with the composition and trivalent chromium is deposited on the article by electrolysis and an article of zinc or zinc plate is coated with a protective trivalent chromium composition.

Abstract: A low temperature aluminum alloy or aluminum corrosion resistant coating has, as essential ingredients, water, 0% hexavalent chromium, an alkali metal permanganate providing at least 760 ppm permanganate, alkali metal or aluminum halide providing at least 100 ppm of halide, and a pH of from about 1.0 to about 4.0.

Abstract: A non-chromium aluminum conversion coating composition for coating aluminum or an aluminum alloy which has as the essential ingredients an alkaline metal permanganate and aluminum nitrate and a pH of about 2.5 to about 4.0. The composition is effective in protecting aluminum and aluminum alloys for more than 168 hours in salt fog at 95.degree. F. according to standard ASTM method B-117. The process, of coating the aluminum or aluminum alloy is generally carried out by cleaning the aluminum or aluminum alloy with sodium hydroxide, and nitric acid-hydrofluoric acid mixture, and then coating with the permanganate-nitrate composition. There is also provided an anodized aluminum or aluminum alloy coated with a non-chromium permanganate composition.

Abstract: A non-chromium aluminum conversion coating composition for coating aluminum or an aluminum alloy which has as the essential ingredients an alkaline metal permanganate and aluminum nitrate and a pH of about 2.5 to about 4.0. The composition is effective in protecting aluminum and aluminum alloys for more than 168 hours in salt fog at 95.degree. F. according to standard ASTM method B-117. The process, of coating the aluminum or aluminum alloy is generally carried out by cleaning the aluminum or aluminum alloy with sodium hydroxide, and nitric acid-hydrofluoric acid mixture, and then coating with the permanganate-nitrate composition. There is also provided an anodized aluminum or aluminum alloy coated with a non-chromium permanganate composition.

Abstract: A method of protecting a non-chromium anodized aluminum or aluminum alloy by rinsing the anodized aluminum or aluminum alloy with warm water to warm the anodized aluminum or aluminum alloy, coating the warm anodized aluminum or aluminum alloy with, a non-chromium alkali metal permanganate solution having a pH in the range of about 4.0 to about 8.0, and a temperature of from about 170.degree. F. to about 212.degree. F., and forming a non-chromium mixed metal oxide coating of aluminum and manganese oxides on the anodized aluminum or aluminum alloy.

Abstract: This invention provides an aluminum alloy conversion coating composition and a process for protecting aluminum alloys, especially the alloys having greater than 1.0% Cu with a conversion coating. The coating is placed on the aluminum alloy in a multi-step process. In a first step the alloy is treated with a composition having as essential ingredients aluminum nitrate and an alkali metal nitrate, in a second step the nitrate treated alloy is treated with an alkali metal permanganate composition and in the final step the alloy is treated with an alkali metal silicate composition.The aluminum conversion coatings of this invention are provided without the need for using toxic chromium compounds.

Abstract: The invention relates to aluminum conversion coating compositions and the resulting aluminum alloy protected with the conversion coating. The aluminum or aluminum alloy is coated with a composition having as its essential ingredients phosphate ions, aluminum ions and nitrate ions with the preferred coating having the phosphate ions supplied by phosphoric acid and the nitrate ions supplied by aluminum nitrate with the aluminum ions present in at least 900 ppm, the phosphate ions present in at least 3170 ppm and the nitrate ions present in at least 6200 ppm.

Abstract: An aluminum conversion coating composition for aluminum or an aluminum alloy. The composition has as essential ingredients alkali metal permanganate, and alkali metal chloride, a pH of 7 or over, and a phosphorous compound selected from phosphorous acid and alkali metal phosphate. The composition may also contain a buffer, such as alkali metal tetraborate, alkali metal metaborate, benzoic acid, alkali metal benzoate, alkali metal carbonate and a mixture of the alkali metal tetra-and metaborates. I also provide a permanganate coating process for protecting the 2000 series by cleaning the aluminum alloy and before coating, deoxidizing the aluminum alloy with an acid.

Abstract: An aluminum conversion coating composition for aluminum or an aluminum alloy. The composition has as essential ingredients alkali metal permanganate, and alkali metal chloride, and a pH of 7 to less than 12.5. The composition may also contain a buffer, such as alkali metal tetraborate, alkali metal metaborate, benzoic acid, alkali metal benzoate, alkali metal carbonate and a mixture of the alkali metal tetra-and metaborates. I also provide a coating composition which contains alkali meal permanganate, an alkali metal silicate and a buffer. This silicate composition has a pH as high as 14. My compositions are effective for protecting the aluminum and aluminum alloys for sufficient hours in salt fog at 95.degree. F. according to standard ASTM method B-117.

Abstract: An aluminum conversion coating by coating composition for coating aluminum or an aluminum alloy. The composition has as an essential ingredient an alkaline metal permanganate and a pH of 7 to less than 12.5. The composition containing a buffer, such as alkaline metal tetraborate, is effective for protecting the aluminum and aluminum alloys for more than 168 hours in salt fog at 95.degree. F. according to standard ASTM method B-117. The process, of coating the aluminum or aluminum alloy is generally carried out by cleaning the aluminum or aluminum alloy with sodium hydroxide, hydrofluoric acid or borax and then coating with the permanganate composition.

Abstract: A method and composition for corrosion protection of metal components of a fluid circulation system utilizing a buffered solution containing perchlorate ion and specific operative additives.