Method and composition of matter for conditioning and passivatin

Details Method and composition of matter for conditioning and passivatin Method and composition of matter for conditioning and passivatin

1985-04-16

1986-09-09

Powell, William A.

Compositions

Etching or brightening compositions

Inorganic acid containing

134 3, 156664, 156903, 252142, 427399, C09K 1304, C23G 102, C23F 100, B44C 122

Patent

active

046107983

ABSTRACT:
A method for preparing and using a certain conditioning and passivation composition on metals and the composition of matter used for such conditioning and passivation, which method involves immersing the metal in a bath consisting of specified quantities of nitric acid, sulfuric acid and chromium trioxide in water. The treatment produces a clean and bright surface on the metal that is resistant to corrosion, without attacking the substrate metal. The passivation composition of the present invention can be used as a final passivation and corrosion removal treatment for stainless steel and as a corrosion removal and passivation treatment for other non ferrous metals.

REFERENCES:
patent: 3523825 (1970-08-01), Callahan et al.
patent: 3787239 (1974-01-01), Schroeder et al.

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