TRIP钢在3.5%NaCl溶液中的腐蚀电化学行为

ELECTROCHEMICAL CORROSION BEHAVIOR OF TRIP STEEL IN 3.5%NaCl SOLUTION

用盐雾加速和极化曲线试验方法研究了TRIP钢在3.5%NaCl溶液中的腐蚀电化学行为。结果表明:两种试样盐雾加速试验后表面均有大面积腐蚀产物出现,且极化曲线均活化。未添加合金元素(A钢)的腐蚀率远高于添加合金元素的(B钢);B钢较A钢的自腐蚀电位明显升高,其腐蚀电流密度下降;B钢表面锈层较为致密,而A钢锈层则相对较为疏松。B钢获得了相对较好的耐蚀效果,主要原因是由于Al、Cu、Cr、Mo、Ni等合金元素在锈层以及锈层与基体的界面中富集,改变了TRIP钢电化学性质所致。

Electrochemical corrosion behavior of TRIP steel in 3.5%NaCl solution was investigated by salt spray test and potentiodynamic polarization curves.The results indicated that large corrosion products were obtained on the specimen surface.Their potentiodynamic polarizations were all activated.The corrosion rate of steel A was significantly higher than that of steel B containing alloying elements.The corrosion potential and current density of steel B were increased and decreased,respectively.The rust layer of steel B was compact and densified compared to steel A.A satisfactory corrosion resistant effect was obtained for steel B.This is attributed to the additions of alloying elements,such as Al,Cu,Cr,Mo,Ni,etc.The enrichment of these alloying elements within the rust layer contributes to the improvement of electrochemical characteristic of TRIP steel.