ACIDIC AQUEOUS SOLUTION AND METHOD FOR PASSIVATING SURFACE OF ZINC OR ZINC/ALUMINUM ALLOY

Title:

ACIDIC AQUEOUS SOLUTION AND METHOD FOR PASSIVATING SURFACE OF ZINC OR ZINC/ALUMINUM ALLOY

Document Type and Number:

Japanese Patent JPS6256579

Kind Code:

A

Abstract:

An aqueous acidic treating solution for forming a chromium-containing passivate coating on the surface of zinc or zinc-aluminium alloys contains chromium ions of which the predominant proportion are in the hexavalent state, preferably in an amount 2-20 g/l., nitrate ions, preferably in an amount 0.5-6 g/l., and phosphate ions, preferably in an amount 1-15 g/l. The solution may also contain fluoride ions, molybdate ions and tungstate ions. The phosphide may be an alkali metal or ammonium phosphate, a polyphosphate or phosphoric acid.

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Inventors:

GEERII EI RETSUHI

Application Number:

JP20356386A

Publication Date:

March 12, 1987

Filing Date:

August 29, 1986

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Assignee:

PARKER CHEMICAL CO

International Classes:

C23C22/24; C23C22/33; C23C22/37; C23C22/38; C23C22/40; C23C22/44; (IPC1-7): C23C22/24

Domestic Patent References:

JPS59222587A	1984-12-14
JPS5431043A	1979-03-07
JPS5268036A	1977-06-06
JP45002090A
JPS6026672A	1985-02-09
JPS5078535A	1975-06-26

Attorney, Agent or Firm:

Akimoto Teruo

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