Abstract
Since it has been found in our previous studies that Ti-added cold rolled steel sheets, when they have been ground, may exhibit inferior phosphatability, the effects of pre-phosphating-treatment, and Ni or F concentration in the phosphating reagents were investigated. It was found that the oxidative effect of F and ClO3 on phosphatability differed greatly, but that other effects were minor. In order to ascertain the etching capacity of two phosphating reagents, the solubility of Fe in the phosphating reagents without Zn ion was examined. The result confirmed the evident difference in Fe solubility between the two types of phosphating.
