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首页> 外文期刊>ISIJ international >Effects of S content and surface finish on pitting corrosion of austenitic stainless steels containing Mo in chloride and bromide solutions
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Effects of S content and surface finish on pitting corrosion of austenitic stainless steels containing Mo in chloride and bromide solutions

机译:S含量和表面光洁度对氯和溴化物溶液中含Mo的奥氏体不锈钢点蚀的影响

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摘要

Pitting corrosion behavior of austenitic stainless steels with Mo was investigated in chloride and bromide solutions. The steels with higher S content as 0.009 mass percent showed higher pitting potential in 1 kmol/m~3 bromide solution than 1 kmol/m~3 chloride solution. On the other hand, the steels with lower S content as 0.0003 mass percent showed opposite results. The higher pitting potential was observed in chloride solution. This tendency became profound with passivation treatment by nitric acid. From the experimental results above, it is highly believed that chloride ions are more detrimental to sulfide inclusions induced pitting than bromide ions, whereas pitting due to breakdown of passive film other than sulfide inclusion is more easily caused in solutions containing bromide ions than chloride ions.
机译:在氯化物和溴化物溶液中研究了Mo对奥氏体不锈钢的点腐蚀行为。 S含量为0.009质量%的钢在1 kmol / m〜3的溴化物溶液中的点蚀电位比1 kmol / m〜3的氯化物溶液更高。另一方面,S含量为0.0003质量%以下的钢显示相反的结果。在氯化物溶液中观察到较高的点蚀电位。随着硝酸的钝化处理,这种趋势变得更加深刻。从上述实验结果,高度相信氯离子比溴离子对硫化物夹杂物引起的点蚀更有害,而在含溴离子的溶液中比氯离子更容易引起除硫化物夹杂物以外的钝化膜击穿而引起的点蚀。

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