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首页> 外文期刊>Journal of Materials Engineering and Performance >Role of Environmental Variables on the Stress Corrosion Cracking of Sensitized AISI Type 304 Stainless Steel (SS304) in Thiosulfate Solutions
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Role of Environmental Variables on the Stress Corrosion Cracking of Sensitized AISI Type 304 Stainless Steel (SS304) in Thiosulfate Solutions

机译：环境变量对硫代硫酸盐溶液中敏化的AISI 304不锈钢（SS304）的应力腐蚀开裂的作用

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摘要

The stress corrosion cracking (SCC) behavior of sensitized AISI type 304 stainless steel (SS304) has been studied in dilute thiosulfate solutions as a function of thiosulfate concentrations and applied potentials. The susceptibility to SCC was observed to increase with thiosulfate concentrations and applied potentials. The addition of boric acid produced the reverse effect. A critical potential was found to exist, below which no SCC took place. Potential fluctuations, as recorded in the tests under open circuit conditions, appeared to be correlated with crack initiation and propagation during SCC. Current fluctuations observed in the controlled potential tests also gave indications of crack nucleation; however, at higher applied potentials such fluctuations were absent. The formation and presence of martensite in the specimens seemed to have a minor role in the overall SCC process. The aggressiveness of the thiosulfate concentration was also an important factor in determining the degree of susceptibility to SCC. The results obtained in the slow strain rate tests under open circuit as well as under potential-controlled conditions suggested a film rupture-anodic dissolution type of mechanism operative during SCC of sensitized SS304 in thiosulfate solutions.
机译：研究了在稀硫代硫酸盐溶液中硫代硫酸盐浓度和施加电势的函数，研究了敏化AISI 304不锈钢（SS304）的应力腐蚀开裂（SCC）行为。观察到对SCC的敏感性随硫代硫酸盐浓度和施加电势的增加而增加。硼酸的添加产生相反的作用。发现存在临界潜能，在此之下未发生SCC。在开路条件下测试中记录的潜在波动似乎与SCC期间的裂纹萌生和扩展相关。在受控电位测试中观察到的电流波动也显示出裂纹成核的迹象。但是，在较高的施加电势下，不会出现这种波动。标本中马氏体的形成和存在似乎在整个SCC过程中起着很小的作用。硫代硫酸盐浓度的侵蚀性也是确定对SCC敏感性的重要因素。在开路以及在电势受控条件下的慢应变速率测试中获得的结果表明，在硫代硫酸盐溶液中敏化SS304的SCC过程中，膜断裂-阳极溶解类型的机理起作用。

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