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首页> 外文期刊>Journal of Materials Engineering and Performance >Study of the Intergranular Corrosion of Sensitized UNS S31803 Stainless Steel in Transpassive Region
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Study of the Intergranular Corrosion of Sensitized UNS S31803 Stainless Steel in Transpassive Region

机译：钝化区敏化UNS S31803不锈钢的晶间腐蚀研究

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摘要

In this study, intergranular corrosion behavior of UNS S31803 duplex stainless steel was investigated using conventional potentiodynamic polarization, double loop electrochemical potentiokinetic reactivation (DLEPR), and electrochemical impedance spectroscopy (EIS) technique carried out at different potentials in the transpassive region. Different types of heat treatments were used to obtain samples with different degrees of sensitization. The results of the DLEPR tests showed that the solution-annealed sample and that was sensitized for half an hour would be considered as nonsensitized ones. Moreover, the sample that was sensitized for 24 h exhibits the highest value of the degree of sensitization. Polarization test results showed a typical active-passive behavior from which the transpassive potential range was determined and used as the range of the applied DC bias in the EIS experiments. Three different AC responses (including capacitive and inductive responses) were observed depending on the value of applied DC bias in the EIS experiments. In addition, it was observed that the presence of the second inductive loop at high applied DC bias is due to the adsorption of nonsoluble corrosion products on the surface of the samples. Moreover, the fitted values to the charge transfer and polarization resistances (R (ct) and R (P)) decreased as the sensitization time increased from 30 min to 24 h. Such observations were in good accordance with the metallographic examination of the corroded surfaces, carried out by optical and scanning electron microscopy techniques, revealing discontinuous grain boundary attack in nonsensitized samples and a continuous network of grain boundary attack in the case of sensitized ones. Moreover, as the applied DC bias increases the ferrite phase attack also occurs in the sensitized samples. In addition, approximately no pitting corrosion was observed on the surface of the corroded samples which is in accordance with their respective cyclic polarization responses.
机译：在这项研究中，UNS S31803双相不锈钢的晶间腐蚀行为是使用常规的电位极化，双环电化学电位动能再活化（DLEPR）和电化学阻抗谱（EIS）技术研究的，该技术是在透射区中的不同电位下进行的。使用不同类型的热处理来获得具有不同敏化度的样品。 DLEPR测试的结果表明，将溶液退火的样品并敏化了半个小时的样品将被视为未敏化的样品。此外，敏化24小时的样品表现出最高的敏化度值。极化测试结果显示了典型的主动-被动行为，可从该行为确定跨被动电位范围，并将其用作EIS实验中施加的直流偏置的范围。根据EIS实验中施加的直流偏置值，观察到三种不同的交流响应（包括电容性和电感性响应）。另外，观察到在高施加的DC偏压下第二感应回路的存在是由于样品表面上不溶性腐蚀产物的吸附。此外，随着敏化时间从30分钟增加到24小时，电荷转移和极化电阻（R（ct）和R（P））的拟合值降低。这些观察结果与通过光学和扫描电子显微镜技术进行的腐蚀表面的金相检查非常吻合，揭示了在非敏化样品中不连续的晶界侵蚀和在敏化样品中的连续晶界侵蚀网络。此外，随着所施加的直流偏置的增加，在敏化的样品中也会发生铁素体相侵蚀。另外，在腐蚀样品的表面上未观察到点蚀，这与它们各自的循环极化响应一致。

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