MANUFACTURE OF DOUBLE-PLATED STEEL SHEET

Title:

MANUFACTURE OF DOUBLE-PLATED STEEL SHEET

Document Type and Number:

Japanese Patent JPS6267194

Kind Code:

A

Abstract:

PURPOSE:To form layers having superior adhesion and fine appearance on a plated steel by plating by previously electrolyzing the steel sheet at a proper anode current density in a soln. contg. phosphoric acid, chlorine ions and hydrogen ions at specified concns. CONSTITUTION:When a plated steel sheet is plated again, it is previously electrolyzed at >=2A/dm<2> anode current density in a soln. of 4-7pH having 0.05-3mol/l total concn. of phosphoric acid and 0.01-1mol/l concn. of chlorine ions to remove contaminants such as metallic oxide or hydroxide and chromate from the plated surface. Two or more layers of the same kind or different kinds are then formed on the cleaned plated surface by plating.

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Inventors:

HOTTA WATARU
OKADA KOJI

Application Number:

JP20510085A

Publication Date:

March 26, 1987

Filing Date:

September 17, 1985

Export Citation:

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Assignee:

NIPPON STEEL CORP

International Classes:

C25D5/26; C25D5/10; (IPC1-7): C25D5/10; C25D5/26

Attorney, Agent or Firm:

Teruo Taniyama

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