Method for formation of hydrophilic corrosion-resistant coating

Details Method for formation of hydrophilic corrosion-resistant coating Method for formation of hydrophilic corrosion-resistant coating

1986-06-24

1987-06-09

Page, Thurman K.

Metal treatment

Compositions

Heat treating

4273881, 4273882, C23F 710, B05D 302

Patent

active

046718257

ABSTRACT:
A hydrophilic corrosion-resistant coat is formed on the surface of a metallic material, e.g., aluminum and its alloys, by a method which comprises preparatorily cleaning the surface of the metallic material, applying on the cleaned surface of the metallic material an aqueous treating liquid produced by adding a water-soluble acrylic acid polymer and colloidal silica and effective amounts of a polyhydric alcohol and/or saccharide to an aqueous solution containing hexavalent chromium compound or trivalent and hexavalent chromium compounds, phosphoric acid, and a fluorine compound. The applied layer of the treating liquids is dried and baked, the baking being at a temperature in the range of 100.degree. to 250.degree. C.

REFERENCES:
patent: 4341558 (1982-07-01), Yashiro et al.
patent: 4349391 (1982-09-01), Schell
patent: 4427459 (1984-01-01), Goltz
patent: 4462842 (1984-07-01), Uchiyama et al.
patent: 4524092 (1985-06-01), Cesca et al.
patent: 4595424 (1986-06-01), Hacias

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