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

1991-09-03

1993-06-22

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148273, C23C 2206

Patent

active

052213714

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 alcoholic 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: 2512493 (1950-06-01), Gide
patent: 4610732 (1986-09-01), Sasalic

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