Treating zinciferous metal surfaces to blacken them

Details Treating zinciferous metal surfaces to blacken them Treating zinciferous metal surfaces to blacken them

1989-08-03

1991-01-15

Woo, Jay H.

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148277, 148284, 106 1415, C23C 2260, C23C 2268, C23C 3000

Patent

active

049850873

ABSTRACT:
Zinc and zinc alloy surfaces can be given an effective corrosion inhibiting treatment by contact for less than a minute with an alkaline aqueous solution having a pH not more than 11 and containing at least 0.020 g/L of dissolved nickel ions and sufficient ammonia to give a molar ratio of ammonia to nickel ion of at least 6. If the concentration of nickel ions in the treating solution is at least 1.0 g/L, a durable blackening of the surface is also produced. Both the corrosion resistance and the quality of the blackening can usually be further improved by subsequent conventional phosphate conversion coating.

REFERENCES:
patent: 1638273 (1927-08-01), Pacz
patent: 3444007 (1969-05-01), Maurer
patent: 3929514 (1975-12-01), Houlihan
patent: 4278477 (1981-07-01), Reinhold
patent: 4381203 (1983-04-01), Reinhold
patent: 4479832 (1984-10-01), Hart

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