りん酸亜鉛皮膜結晶水挙動の耐水密着性能に与える影響(自動車用鋼板)(<特集>表面処理)

概要

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A behavior of the crystal water of zinc phosphate and its relationship to wet adhesion of paint on electrogalvanized steel has been investigated. The conversion coating of Zn_3(PO_4)_24H_2O under the paint film entirely became dehydrated Zn_3(PO_4)_22H_2O by baking the film at the every content of Ni and Mn in the coating. In the case of low contents of Ni and Mn in the coating, Zn_3(PO_4)_22H_2O became rehydrated Zn_3(PO_4)_24H_2O by immersion in water on wet adhesion test. However in the case of high contents Ni and Mn, Zn_3(PO_4)_22H_2O was not rehydrated. The rehydration rate decreased with increasing the contents of Ni and Mn in the coating. Therefore, it was found that the coating including high contents of Ni and Mn showed a very good wet adhesion. Moreover, the crystal of zinc phosphate coating including high contents of Ni and Mn was proved to be fine, dense and almost amorphous.
1986-06-01