| 摘要 |
PURPOSE:To form an unplated side having superior suitability to chemical conversion treatment when a one-side electroplated steel sheet is manufactured, by anodically electrolyzing the unplated side of the steel sheet in an electrolytic soln. contg. triethanolamine and a soluble sulfate as principal components. CONSTITUTION:One side of a steel sheet is plated with a Zn-Ni alloy or the like, and the unplated side of the steel sheet is anodically electrolyzed in an electrolytic soln. of 1.5-13pH contg. >=2g/l triethanolamine, 200g/l soluble sulfate such as Na2SO4, K2SO4 or LiSO4 and 200g/l NaHPO4 as a pH adjusting agent. A one-side plated steel sheet whose unplated side has high cleanliness and superior suitability to chemical conversion treatment can be easily manufactured.
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