自動車用 Zn 及び Zn 系合金めっき鋼板の塗膜下腐食挙動

概要

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The behavior of under-film corrosion of zinc and zinc alloy coated steel sheets for automobiles in cyclic wet and dry environments was investigated by EPMA and X-ray diffraction. It is recognized that a deteriorated corrosion intermediate of zinc and zinc alloy coatings due to attacking by chlorine ion was formed between a sound coating and corrosion products under paint→regandless of a variety of coatings. On the other hand, the final corrosion products of coatings observed were ZnCl_2・4Zn(OH)_2, ZnO, Zn(OH)_2. Therefore, it was considered that zinc in the coatings is transformed once into chloride and subsequently the chloride is transformed into ZnCl_2・4Zn(OH)_2, ZnO, Zn(OH)_2. As a result it was found that corrosion resistance of zinc and zinc alloy coated steel sheet was attributable to resistance to attacking by chlorine ion.
社団法人日本鉄鋼協会の論文
1990-08-01