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溶解氧对2205双相不锈钢在热浓缩海水中点蚀行为的影响 预览

Effect of Dissolved Oxygen on Pitting Resistance of 2205 Duplex Stainless Steel in Hot Concentrated Seawater
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摘要 运用循环阳极极化曲线和电化学阻抗谱等方法研究了溶解氧含量对2205双相不锈钢在72℃浓缩海水中点蚀行为的影响。结果表明:随着海水中溶解氧含量从0.34mg/L增至3.06mg/L,2205双相不锈钢的腐蚀电位与点蚀电位分别升高了约0.16V和0.209V,钝化膜电阻和电荷转移电阻增大,钝化膜稳定性增强、不易被破坏而使2205双相不锈钢发生点蚀;但是,当2205双相不锈钢发生点蚀后,随溶解氧含量增加,再钝化电位下降较小(约0.072V),循环极化测量时蚀坑生长的电位范围变宽,蚀坑生长所消耗的电量逐渐增大,形成的蚀坑深度增加。 The effect of dissolved oxygen concentration on pitting corrosion behavior of 2205 duplex stainless steel in concentrated seawater at 72 ℃ was studied by cyclic anodic polarization curve and electrochemical impedance spectroscopy(EIS).The results indicate that with the increase of dissolved oxygen concentration from 0.34 mg/L to 3.06 mg/L in seawater,the corrosion potential and pitting potential of 2205 duplex stainless steel increased by about 0.16 Vand 0.209 V respectively,the resistance values of passive film and charge transfer process were enhanced greatly.So the passive film became more stable and hard to be destroyed to make pitting corrosion happen in 2205 duplex stainless steel.However,the repassivation potential slightly decreased by about 0.072 Vwith the increase of dissolved oxygen concentration after pitting corrosion occurred in 2205 duplex stainless steel.The pits grew in a wide potential range and then consumed more electrical charges during the cyclic polarization measurements,which led to the formation of deeper pits.
作者 张程 曾洪涛 毕洪运 李谋成 ZHANG Cheng;ZENG Hongtao;BI Hongyun;LI Moucheng(Institute of Materials, Shanghai University, Shanghai 200072, China;Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900, China)
出处 《腐蚀与防护》 CAS 北大核心 2019年第8期549-554,共6页 Corrosion & Protection
基金 国家自然科学基金资助项目( 51571139,U1660205) 上海市科学技术委员会支撑项目( 15XD1520100).
关键词 双相不锈钢 点蚀 溶解氧 热浓缩海水 duplex stainless steel pitting corrosion dissolved oxygen hot concentrated seawater
作者简介 通信作者:李谋成(1970—),研究员,博士,主要研究方向为腐蚀电化学,13918307362,mouchengli@shu. edu. cn.
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