Corrosion suppression of stainless steel in caustic media

Details Corrosion suppression of stainless steel in caustic media Corrosion suppression of stainless steel in caustic media

1991-09-16

1992-10-13

Stoll, Robert L.

Compositions

Preservative agents

Anti-corrosion

422 13, C23F 1118

Patent

active

051548607

ABSTRACT:
Disclosed is a method of inhibiting the electrochemical corrosion of stainless steel immersed in an aqueous solution of about 20 to about 40 wt % alkali metal hydroxide at a temperature of less than 100.degree. C. About 2 to about 500 ppm of sodium borohydride, hydrazine, or a mixture thereof is added to the aqueous solution.

REFERENCES:
patent: 4585579 (1986-04-01), Bommaraju
Chemical Abstract CA(2):12811c, 1979, Perekhrest, N. A., et al., "Use of Hydrazine in Alkaline Etching of the Carbon Steel Surface".
Derwent Abstract 89-036793 "Manufacture of Chromated Galvanized Steel Material Excellent in Surface Characteristics", Kimura et al., 1987 of 87JP-192391.
Derwent Abstract 89-082676/11, "Manufacture of Chromated Zinc- or Zinc-Alloy-plated Steel Prods. by Electrolysing in Bath . . . ", Kawasaki Steel, 1987 of JP 01-36793.

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