On the corrosion mechanism of AISI 204Cu stainless steel in chlorinated alkaline media
On the corrosion mechanism of AISI 204Cu stainless steel in chlorinated alkaline media
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DOI：
10.1016/j.corsci.2008.08.029
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发表时间：
2008-11
影响因子：
8.3
通讯作者：
L. Freire;X. Nóvoa;G. Pena;V. Vivier
中科院分区：
文献类型：
--
作者：
L. Freire;X. Nóvoa;G. Pena;V. Vivier
电化学技术（CV、SECM、CPT）和表面分析技术（EDX、SEM）已用于评估 AISI 204Cu 不锈钢的腐蚀行为。该钢的性能与 AISI 304 和 AISI 434 不锈钢在氯化碱性介质中的性能进行了比较。所有样品在室温下在氯离子与羟基比率为 10 的动电位极化下均表现良好。在此比率下，AISI 204Cu 和 AISI 434 钢的点蚀电位分别为 +0.47V vs. SCE 和 +0.31V vs. SCE。此外，AISI 204Cu 钢的临界点蚀温度高于 AISI 434 钢，分别为 58°C 和 28°C。就耐腐蚀性能而言，AISI 204Cu不锈钢可分为优于AISI 434钢和较差于AISI 304钢。局部电化学和化学检查可以证明一些凹坑长期的局部活性，并得出结论，低镍合金 AISI 204Cu 不锈钢的改进的腐蚀性能应归因于活性腐蚀部位的铜渗碳。
Electrochemical techniques (CV, SECM, CPT) and surface analysis techniques (EDX, SEM) have been employed to assess the corrosion behaviour of the AISI 204Cu stainless steel. The behaviour of this steel has been compared with that of AISI 304 and AISI 434 stainless steels in chlorinated alkaline media. All samples performed well at room temperature under potentiodynamic polarisation up to a chloride to hydroxyl ratio of 10. At this ratio the AISI 204Cu and the AISI 434 steels presented pitting potential at +0.47V vs. SCE and +0.31V vs. SCE, respectively. Moreover, the critical pitting temperature was higher for the AISI 204Cu steel than for the AISI 434 steel, respectively 58°C and 28°C. In terms of corrosion performance of the AISI 204Cu stainless steel can be classified better than the AISI 434 steel and worse than the AISI 304 steel. Local electrochemical and chemical examinations allowed evidencing the local activity of some pits over long period, and to conclude that the improved corrosion performance of the low nickel alloy AISI 204Cu stainless steel should be ascribed to copper cementation at active corrosion sites.