自動車排ガス凝結水環境下における Al めっき鋼板の耐食性と腐食挙動

概要

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The followings are main results of investigation of corrosion behavior of aluminized steel sheet under exhaust gas condensate in automotive muffler. (1) In neutral or weakly alkaline solution of NH_4 including Cl^-, NO_3^-, SO^<2->_4, CO^<2->_3, CH_3COO^- and HCOO^- which are found in exhaust gas condensate, corrosion of aluminized low carbon steel sheet is enhanced by galvanic corrosion between coating layer and base steel at the site of coating defect. (2) Galvanic corrosion above is influenced substantially by the corrosion characteristic of coating layer and base steel. In the solution including Cl^-, SO^<2->_4, CH_3COO^- or HCOO^- ion individually, corrosion of aluminized steel is accelerated by corrosion of base steel. Especially under Cl^- rich condition this phenomenon is remarkable. In the solution including CH_3COO^- or HCOO^- ion, corrosion is accelerated under lower pH corrosion condition which corresponds to ion dissociation at high temperature, but it is restrained by formation of passivation film on base steel in higher pH corrosion condition at room temperature.
社団法人日本鉄鋼協会の論文
1992-10-01