采用全浸加速腐蚀实验以及电化学实验方法,研究了40CrNi2Si2MoVA钢在0.5 mol/L NaNO3、NaCl和Na2SO4溶液中的腐蚀行为,并利用扫描电子显微镜(SEM)和X射线衍射分析(XRD)对腐蚀形貌及腐蚀产物进行了表征.结果表明:40CrNi2Si2MoVA钢在0.5 mol/L的NaNO3、NaCl和Na2SO4溶液中的腐蚀形貌及生成的腐蚀产物均不同,NaNO3溶液中生成的腐蚀产物主要为α-FeOOH,吸附在基体表面,阻碍了基体的腐蚀,3种阴离子环境对其腐蚀速率大小依次为:SO42-＞Cl-＞NO3-.电化学研究结果表明40CrNi2Si2MoVA钢在0.5 mol/L的NaNO3、NaCl和Na2SO4溶液中均未发生钝化现象,且在Na2SO4溶液中的腐蚀电流和阳极塔菲尔斜率最大.
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