贫双相钢在3.5%氯化钠溶液中的应力腐蚀开裂

M. Shahid, A. Jadoon, Qanita Tayyaba, H. Farooq
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引用次数: 0

摘要

双相不锈钢(DSS)具有奥氏体和铁素体相结合的优异性能,广泛应用于石油化工、纸浆、造纸等行业。它们具有更好的耐蚀性,特别是氯化物应力腐蚀和氯化物点蚀,并表现出比标准奥氏体不锈钢更高的强度。由于这些原因,它们是海上油气行业的优秀候选者。采用失重法、电化学腐蚀试验和慢应变速率试验(SSRT)研究了双相不锈钢在3.5%氯化钠溶液中的应力腐蚀行为。1700小时后失重数据显示无明显腐蚀。在3.5% NaCl溶液中进行电化学极化试验,腐蚀速率为0.008 mpy,钝化范围为735 ~ 950 mV Vs SSC。双相不锈钢在3.5% NaCl溶液中的慢应变速率试验也显示出相似的应力-应变行为。相比之下,低碳钢的应力-应变行为表现出约25%的伸长率损失。优良的耐蚀性,特别是抗点蚀性被认为是DSS保持良好延展性的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stress Corrosion Cracking of Lean Duplex Steel in 3.5% Sodium Chloride Solution
Duplex stainless steels (DSS) exhibit attractive combination of austenitic and ferritic properties and have been extensively used in various industries such as petrochemical, pulp and paper etc. They demonstrate better corrosion resistance, especially chloride stress corrosion and chloride pitting corrosion, and exhibit higher strength than standard austenitic stainless steels. For these reasons, they are excellent candidate for offshore oil and gas industry. In the present study, stress corrosion behaviour of duplex stainless steel in 3.5% sodium chloride solution, has been investigated by weight loss measurements, electrochemical corrosion testing and slow strain rate test (SSRT). Weight loss data showed no significant corrosion after 1700 hours. Electrochemical polarization test in 3.5% NaCl solution exhibited a uniform corrosion rate of 0.008 mpy showing passivity in the range of 735–950 mV Vs SSC. A comparison of the slow strain rate test for duplex stainless steel in 3.5% NaCl solution also showed a similar stress-strain behaviour. In contrast, the stress-strain behaviour of mild steel showed a loss of about 25% elongation. The excellent corrosion and especially the pitting resistance was considered to be responsible for maintaining good ductility in DSS.
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