Non-toxic corrosion resistant conversion coating for aluminum an

Details Non-toxic corrosion resistant conversion coating for aluminum an Non-toxic corrosion resistant conversion coating for aluminum an

1993-11-16

1995-05-30

Silverberg, Sam

Stock material or miscellaneous articles

Composite

Of metal

4284722, 428472, C23C 2206

Patent

active

054197902

ABSTRACT:
A non-toxic corrosion resistant conversion coating for aluminum is formed by a process which includes subjecting the aluminum to an acidic aqueous solution containing potassium permanganate and cerous chloride, alone or in combination with strontium chloride. The corrosion resistance is improved by a subsequent treatment in an alkaline solution containing molybdate, nitrite and metasilicate ions. The corrosion resistant is further improved by treating the coated surface with an acholic solution containing glycidoxy(epoxy)polyfunctionalmethoxysilane, alone or in combination with phenyltrimethoxysilane. The coating thus produced is a mixture of oxides and hydroxides of cerium strontium and aluminum. These oxides and hydroxides may also be intermixed with molybdate silicate and nitrite ions. In the most corrosion resistant form the mixture further includes a silane overcoat.

REFERENCES:
patent: 5192374 (1993-03-01), Kindler

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