Hot dip coated steel sheet and process for producing the same

Details Hot dip coated steel sheet and process for producing the same Hot dip coated steel sheet and process for producing the same

1987-09-24

1989-04-04

Silverberg, Sam

Coating processes

Heat decomposition of applied coating or base material

4273768, 427433, 427406, C23C 226

Patent

active

048185680

ABSTRACT:
Disclosed is a hot dip coated steel sheet obtained by hot dipping a steel sheet in a hot-dip metal bath comprising zinc-based or zinc/aluminum based alloy, and a process for producing the same.
The hot dip coated steel sheet has a film of oxides which are compounds of cobalt or iron, or both of these, with oxygen, and the film can prevent the hot dip coated steel sheet from undergoing color change into grayish black in the case where spangles are minimized, where a coating contains corrosion resistance-improving elements such as magnesium and aluminum, or where a chromate treatment is applied after the mechanical processings were carried out.
Formation of oxide film on the surface of the hot dip coated steel sheet is carried out by a method in which an aqueous solution obtained by dissolving a salt of cobalt or a salt of iron or both of these is sprayed on the surface of a coating of the steel sheet when the temperature of the coating is 170.degree. C. or higher. The salt is preferably a nitrate or a chloride for both the salt of cobalt and the salt of iron.

REFERENCES:
patent: 1370967 (1921-03-01), Hommel
patent: 2328101 (1943-08-01), Rosenblatt
patent: 4663245 (1987-05-01), Yoshida
Patent Publication No. 51-30539, 3/15/76, Japan, Kokai.
Patent Publication No. 52-152834, 12/19/77.

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