Method of treating a one-side electrogalvanized steel sheet

Details Method of treating a one-side electrogalvanized steel sheet Method of treating a one-side electrogalvanized steel sheet

1989-07-28

1991-08-27

McFarlane, Anthony

Cleaning and liquid contact with solids

Processes

For metallic, siliceous, or calcareous basework, including...

134 15, 134 42, 134122R, 252100, 252142, 427132, 427406, C23G 102

Patent

active

050430220

ABSTRACT:
In a method of treating one-side electrogalvanized steel sheets, the uncoated side is contacted with an aqueous pickling solution containing a water-soluble hydroxycarboxylic acid and a water-soluble peroxo compound. In this way, extremely resistant mixed oxides are separated from one-side electrogalvanized sheets, which, otherwise, would lead to stripy yellowish and brownish stains on the uncoated steel surface. In addition, the new metal surface formed is passivated.

REFERENCES:
patent: 3537926 (1970-11-01), Fischer
patent: 4545918 (1985-10-01), Pralies
patent: 4659605 (1987-04-01), Malik et al.
patent: 4857225 (1989-08-01), Terada et al.

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