Ternary corrosion resistant coatings

Details Ternary corrosion resistant coatings Ternary corrosion resistant coatings

1980-03-26

1981-07-07

Kendall, Ralph S.

Metal treatment

Compositions

Heat treating

148 614R, C23F 700

Patent

active

042772923

ABSTRACT:
A highly acidic aqueous conversion coating for aluminum which is corrosion resistant, provides excellent adhesion with overlaying coatings and does not blacken when the coating substrate is immersed in boiling water. The coating composition is a ternary variety which contains zirconium, fluoride, and tannin. The pH of the coating bath is uniquely more acidic than conventional baths which operate at a pH of 3 and above, and is between 2.3 and 2.95.

REFERENCES:
patent: 3964936 (1976-06-01), Das
patent: 4017334 (1977-04-01), Matsushima et al.
patent: 4054466 (1977-10-01), King

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