Compositions: coating or plastic – Coating or plastic compositions – Corrosion inhibiting coating composition
Patent
1986-09-18
1987-12-08
Wax, Robert A.
Compositions: coating or plastic
Coating or plastic compositions
Corrosion inhibiting coating composition
148 627, C23F 1118
Patent
active
047116676
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.
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Sanchem, Inc.
Wax Robert A.
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