| 摘要 |
PROBLEM TO BE SOLVED: To provide a low-cost highly corrosion-resistant electroplated steel sheet withstanding the severe environment even with a thin coating weight, not causing the deterioration of formability and spot weldability and excellent in bare corrosion resistance, flaw corrosion resistance after being coated, end- face corrosion resistance, etc., and its manufacturing method. SOLUTION: This composite electroplated steel sheet has a composite electroplating layer wherein the oxide grains each with a corrosion inhibitor consisting of at least one kind of organic compound selected from alkynes, alkynols, phenols, amines or their salts, thio compounds, heterocyclic compounds and aromatic carboxylic compounds or their salts adsorbed thereon are dispersed and containing 0.001-20 mass % C on one or both sides of the bare steel sheet or plated steel sheet. Otherwise, the composite electroplated steel sheet has a composite electroplating layer wherein the microcapsules encapsulating the corrosion inhibitor are dispersed and containing 0.001-20 mass % C.
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