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pH值对304与316不锈钢在高温高压水中腐蚀行为的影响研究
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Abstract:
本文以304不锈钢与316不锈钢为研究对象，通过动态腐蚀试验研究了pH值对两种不锈钢材料在高温高压水环境中腐蚀行为的影响规律。SEM-EDS分析证实两种不锈钢材料表面均形成了Fe、Cr、Ni为主的颗粒氧化物，然后采用XPS获得了不锈钢表面氧化膜中主要元素的化学形态与质量占比。腐蚀动力学分析结果表明两种不锈钢材料的腐蚀速率与释放速率均随浸泡时间呈现先增加后趋于平缓的趋势，此外，6.8~7.4范围内的pH值变化对两种不锈钢材料的腐蚀释放行为影响较小。
The effect of pH value on the corrosion behavior for 304 and 316 stainless steels in high-temperature and high pressurized water was investigated through corrosion experiment. The SEM-EDS results confirm the existence of metal oxide particles (Ni, Fe, Cr) on 304 and 316 stainless steel surfaces. The chemical component and speciation in oxide film were obtained by means of XPS analysis. The corrosion kinetics curves reveal that the corrosion rate and release rate firstly increase over exposing time, then tend to moderate. Furthermore, the corrosion release behaviors of 304 and 316 stainless steels are little influenced by the pH varied between 6.8 and 7.4.
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