溶解氧对2205双相不锈钢在热浓缩海水中点蚀行为的影响
Effect of Dissolved Oxygen on Pitting Resistance of 2205 Duplex Stainless Steel in Hot Concentrated Seawater
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0.34 mg/L增至3.06 mg/L，2205双相不锈钢的腐蚀电位与点蚀电位分别升高了约0.16 V和0.209 V，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0.072 V），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。
点蚀
溶解氧
热浓缩海水
duplex stainless steel
pitting corrosion
dissolved oxygen
hot concentrated seawater
Abstract
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 V and 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 V with 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.
中图分类号 TG172 DOI 10.11973/fsyfh-201908001
所属栏目 试验研究
基金项目 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）
收稿日期 2018/2/24
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引用该论文: ZHANG Cheng,ZENG Hongtao,BI Hongyun,LI Moucheng. Effect of Dissolved Oxygen on Pitting Resistance of 2205 Duplex Stainless Steel in Hot Concentrated Seawater[J]. Corrosion & Protection, 2019, 40(8): 549
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参考文献
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【2】FRANCIS R, BYRNE G, WARBURTON G. The corrosion of superduplex stainless steel in different types of seawater//NACE-International Corrosion Conference Series 2011. Houston:NACE International:11351.
【3】孙长庆.双相不锈钢-海水淡化中及水处理装置材料的理想选择//第十届海洋科技与经济发展国际论坛暨2009亚太脱盐大会论文集.[出版地不详]:[出版者不详],2009:288-291.
【4】郑家青,龚利华,郭为民,等.不同温度下溶解氧对304不锈钢在海水中腐蚀性能的影响.腐蚀与防护,2011,32(9):708-711.
【5】张亮,李晓刚,杜翠薇,等.X70管线钢在库尔勒土壤模拟溶解氧液中的腐蚀行为.金属热处理,2007,32(12):93-95.
【6】胡荣宗,赵雄超,翁玉华,等.醋酸介质中溶解氧对不锈钢和磷脱氧铜腐蚀行为影响.电化学,2002,8(4):409-414.
【7】ARJMAND F, ZHANG L F, WANG J M. Effect of temperature, chloride and dissolved oxygen concentration on the open circuit and transpassive potential values of 316L stainless steel at high-temperature pressurized water. Nuclear Engineering and Design, 2017, 322:215-226.
【8】BAEK W C, KANG T, SOHN H J, et al. In situ surface enhanced Raman spectroscopic study on the effect of dissolved oxygen on the corrosion film on low carbon steel in 0.01 M NaCl solution. Electrochimica Acta, 2001, 46(15):2321-2325.
【9】FENG Z C, CHENG X Q, DONG C F, et al. Effects of dissolved oxygen on electrochemical and semiconductor properties of 316L stainless steel. Journal of Nuclear Materials, 2010, 407(3):171-177.
【10】OYAIDZU M, ISOBE K, HAYASHI T, et al. Effect of tritium and dissolved oxygen on anodic polarization of SUS304 stainless steel in sulfuric acid solution. Journal of Nuclear Science and Technology, 2011, 48(6):880-884.
【11】傅晓蕾,马力,闫永贵,等.溶解氧浓度对船体钢在海水中腐蚀行为的影响.腐蚀与防护,2010,31(12):942-945.
【12】OTSUKA Y, NAGAOKA S, MUTOH Y. Effects of dissolved oxygen on fatigue characteristics of austenitic stainless steel in 0.9wt% sodium chloride solutions. Procedia Engineering, 2011, 10:1333-1338.
【13】JUNG H, KWON K J, LEE E, et al. Effect of dissolved oxygen on corrosion properties of reinforcing steel. Corrosion Engineering, Science and Technology, 2011, 46(2):195-198.
【14】龚敏,黄文恒,邹振,等.2种温度下O2对2205DSS在盐卤介质中点蚀行为的影响.材料保护,2009,42(10):23-25.
【15】王晶,尚新春,路民旭,等.316L不锈钢在不同环境中点蚀形核研究.材料工程,2015,43(9):12-18.
【16】QIAO Y X, ZHENG Y G, OKAFOR P C, et al. Electrochemical behaviour of high nitrogen bearing stainless steel in acidic chloride solution:Effects of oxygen, acid concentration and surface roughness. Electrochimica Acta, 2009, 54(8):2298-2304.
【17】Standard Practice for the Preparation of Substitute Ocean Water:ASTM D1141-98(2013).:ASTM International,2013.
【18】WEISS R F. The solubility of nitrogen, oxygen and argon in water and seawater. Deep Sea Research and Oceanographic Abstracts, 1970, 17(4):721-735.
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