Zn-Ni 系合金めつき鋼板の耐水密着性におよぼす化成処理浴成分の影響

概要

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Effects of composition of phosphate solution on wet adhesion have been investigated. The lower Zn^〓 and the higher Ni^〓 concentration in phosphate solution increase the wet adhesion of both Zn-Ni alloy and Zn electroplated steel sheets, and also decrease the effect of cathodic electrodeposition (C-ED) baking temperature on wet adhesion. X-ray diffraction images of phosphate film formed on samples show Hopeite invariably, even if compositions of phosphate solution change, but Ni content in phosphate film is different. The higher Ni^〓 concentration in phosphate solution becomes, the richer Ni content in phosphate film and at the same time, the more eminent wet adhesion becomes. In the case of Zn-Ni alloy electroplated steel sheet, partial Ni contained in phosphate film is supplied by plated film, and Ni content in phosphate film changes according to Ni concentration on surface of Zn-Ni alloy electroplated steel sheet. For these reasons, wet adhesion of Zn-Ni alloy electroplated steel sheet coated by C-ED is governed by properties of phosphate film formed on surface. Metal ion balance of phosphate solution changes properties of phosphate film. Ni in electroplated film increases the Ni content in phosphate film and improves the wet adhesion.
社団法人日本鉄鋼協会の論文
1985-08-01