采用电化学技术(动电位极化曲线,自腐蚀电位,EIS,Mott-Schottcky(MS)曲线及循环伏安曲线)和表面分析方法(SEM和原位Raman光谱)研究了空冷20SiMn钢在pH值均为10.64的3种浓度的碳酸盐缓冲液和浓度恒定为0.437×10-3mol/L的NaOH溶液中的腐蚀行为.结果表明,20SiMn钢在NaOH溶液中发生了均匀腐蚀,经Fe(OH)2转变为最终产物a-Fe2O3和γ-FeOOH;在低浓度碳酸盐缓冲液中发生了局部腐蚀,经绿锈GRs得到最终腐蚀产物α-Fe2O3和β-FeOOH;在高浓度碳酸盐缓冲液中发生了钝化,并且受可溶性离子Fe(CO3)22-的影响,钝化膜的耐蚀性随碳酸盐总浓度的升高存在极值.
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