Compositions: coating or plastic – Coating or plastic compositions – Corrosion inhibiting coating composition
Patent
1987-08-17
1988-07-05
Wax, Robert
Compositions: coating or plastic
Coating or plastic compositions
Corrosion inhibiting coating composition
148 627, C23F 1118
Patent
active
047552247
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. I also provide a process of coating the aluminum or aluminum alloy by cleaning the aluminum or aluminum alloy to a break-free surface with commercial non-ionic surfactants of polyoxyethylene or polyoxypropylene derivatives of organic acids, alcohols, alkyphenols or amines. Then coating the cleaned aluminum alloy with the permanganate composition.
REFERENCES:
patent: 3039899 (1962-06-01), Keller et al.
patent: 3516877 (1970-06-01), Papafingos et al.
Sanchem, Inc.
Wax Robert
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