片面表面処理鋼板における非処理面のリン酸塩処理性

概要

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The phosphatability of the unpainted and ungalvanized surfaces of steel sheet that is coated on one side, was investigated. It was found that when unpainted surfaces were heated for 2min at 280°C, crystal size and weight of phosphate increased and the phosphophyllite ratio declined, and as a result, paint adhesion was reduced. When heated for a longer period, however, phosphatability of the surface was virtually the same as unheated surfaces.This peculiarity seems to be due to the diffusion of Mn from the bulk to the surface. Small amounts of residual Zn on the ungalvanized surfaces resulted in smaller crystals and a lower phosphophyllite ratio. Fluoride type phosphating reagent resulted in better wet adhesion than chlorate type, and the difference seems to depend on differences in the etching capacity of those two phosphate reagents.
社団法人表面技術協会の論文