Conversion coating of aluminum and its alloys and compositions a

Details Conversion coating of aluminum and its alloys and compositions a Conversion coating of aluminum and its alloys and compositions a

1993-11-01

1995-02-21

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148259, 148275, C23C 2236

Patent

active

053912390

ABSTRACT:
Conversion coatings containing elpasolite and/or cryolite can be formed on aluminum substrates by contacting the substrates with an aqueous liquid composition containing adequate free fluoride ion activity and concentrations of dissolved sodium and potassium, if a potassium content in the coating is desired as is usual. The aqueous liquids preferably also contain phosphate and polyhydroxy organic compounds and may contain surfactants if a cleaning effect is desired.

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