用恒电位法和动电位法研究了254SMO不锈钢和2205双相不锈钢在50 g/L, 100g/L和200 g/L NaCl溶液中的临界点蚀温度(CPT)和再钝化温度(CPrT),并绘制了两种材料在不同浓度溶液中的点蚀电位Epit和再钝化电位Eprot随温度的变化图, 发现浓度越大,突变区域变缓变宽, 材料CPT下降, 耐蚀性下降. 当温度在CPT以上时,Δ E=Epit-Eprot的值展示出对温度和Cl-浓度的非依赖性.并且对254SMO在CPT前后的点蚀形貌进行了观察.
The critical pitting temperature (CPT) and the critical protection temperature (CPrT) for 254SMO stainless steel and 2205 duplex stainless steel were investigated in solutions with 50 g/L, 100 g/L and 200 g/L NaCl using potentiostatic and potentiodynamic measurements. Plots of pitting potential Epit and passive potential Eprot vs temperature were shown for the steels in solutions with different concentrations of NaCl. With the increasing Cl- concentration, both of the corrosion resistance and CPT decreased and the regions of abrupt change became broader and slower. Above the CPT, the value of $\Delta E (Epit-Eprot) was independent from temperature and chloride concentration. In addition, the morphologies of the formed pits below and above CPT were observed.
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