20CrMnTi钢在海洋环境中的腐蚀行为
Corrosion Behavior of 20CrMnTi Steel in Marine Environment
摘 要
依据海洋设备的实际服役条件，采用电化学测试、人造海水全浸腐蚀试验、盐雾/干/湿交替循环腐蚀试验、电偶腐蚀试验和实海腐蚀试验等方法，研究了20CrMnTi钢在海洋环境中的腐蚀行为。结果表明：20CrMnTi钢在3.5% NaCl溶液中的自腐蚀电位为-0.516 V （vs.SCE），自腐蚀电流密度为1.563×10-6 A/cm2，点蚀电位为-0.473 V （vs.SCE），极化曲线无钝化区间；在人造海水全浸腐蚀试验中20CrMnTi钢的腐蚀速率为78.66 μm/a，在盐雾/干/湿交替循环腐蚀试验中腐蚀速率为2 830.27 μm/a，与05Cr17Ni4Cu4Nb不锈钢偶连时，20CrMnTi钢在人造海水中的腐蚀速率为286.42 μm/a，在三亚实海中的腐蚀速率为310.06 μm/a，腐蚀形式主要为均匀腐蚀；盐雾/干/湿交替循环腐蚀可对20CrMnTi钢的腐蚀起到明显加速作用；在实验室电偶腐蚀试验中20CrMnTi钢的腐蚀速率与实海腐蚀时相近，因此实验室电偶腐蚀试验可较好模拟设备在实际海洋环境中的腐蚀规律。
海洋环境
腐蚀
20CrMnTi steel
marine environment
corrosion
Abstract
According to the actual service conditions of marine equipment, the corrosion behavior of 20CrMnTi steel in marine environment was studied by means of electrochemical testing, artificial seawater full immersion test, salt spray/dry/wet alternating cyclic corrosion test, galvanic corrosion test and real sea corrosion test. The results showed that the free corrosion potential, free corrosion current density and pitting corrosion potential of the 20CrMnTi steel in 3.5% NaCl aqueous solution were -0.516 V (vs. SCE), 1.563 × 10-6 A/cm2 and -0.473 V (vs. SCE), respectively. There was no passivation interval in the polarization curve. The corrosion rates of the 20CrMnTi steel in artificial seawater full immersion test and salt spray/dry/wet alternating cyclic corrosion test were 78.66 and 2 830.27 μm/a, respectively. When the 20CrMnTi steel was coupled with 05Cr17Ni4Cu4Nb stainless steel, the corrosion rates of the 20CrMnTi steel in the artificial seawater and Sanya real sea were 286.42 and 310.06 μm/a, respectively, and the corrosion was uniform. The salt spray/dry/wet alternating cyclic corrosion could significantly accelerate the corrosion of the 20CrMnTi steel. The corrosion rate of the 20CrMnTi steel in galvanic corrosion test in laboratory was similar to that in real sea, so the galvanic corrosion test in laboratory could effectively simulate the corrosion law of devices in real marine environment.
中图分类号 TG172.5 DOI 10.11973/fsyfh-202305006
所属栏目 试验研究
基金项目
收稿日期 2022/11/26
修改稿日期
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引用该论文: WU Zhengjiang,LIU Yiou,LAI Qiwei,ZHANG Yu,LI Dongdong. Corrosion Behavior of 20CrMnTi Steel in Marine Environment[J]. Corrosion & Protection, 2023, 44(5): 28
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参考文献
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【2】ZEN K. Corrosion and life cycle management of port structures[J]. Corrosion Science, 2005, 47(10):2353-2360.
【3】丰卫东. 海洋环境对金属材料的腐蚀及其评价方法[J]. 装备环境工程, 2005, 2(6):86-89.
【4】冯立超, 贺毅强, 乔斌, 等. 金属及合金在海洋环境中的腐蚀与防护[J]. 热加工工艺, 2013, 42(24):13-17.
【5】金立兵, 梁新亚, 王珍, 等. 碳钢在海水全浸区腐蚀的研究进展[J]. 腐蚀与防护, 2020, 41(10):33-38.
【6】曹楚南. 腐蚀电化学原理[M]. 3版.北京:化学工业出版社, 2008.
【7】江旭, 柳伟, 路民旭. 钢铁海洋大气腐蚀试验方法的研究进展[J]. 腐蚀科学与防护技术, 2007, 19(4):282-286.
【8】焦淑菲, 尹艳镇, 梁金禄, 等. 海洋环境中的钢铁腐蚀模拟研究[J]. 化工技术与开发, 2013, 42(8):48-50.
【9】夏政海, 吴清明. 微合金元素Ti对20CrMnTi齿轮钢质量的影响[J]. 特殊钢, 2008, 29(4):45-46.
【10】王明林, 赵沛, 罗海文, 等. 20CrMnTi齿轮钢热塑性的研究[J]. 钢铁, 2001, 36(4):50-53, 19.
【11】YAN M F, LIU Z R. Study on microstructure and microhardness in surface layer of 20CrMnTi steel carburised at 880℃ with and without RE[J]. Materials Chemistry and Physics, 2001, 72(1):97-100.
【12】李冬冬, 邓尼丝, 许佳宁, 等. 65Mn、35Cr2Ni3MoV和AF1410在模拟海洋环境中的耐蚀性[J]. 腐蚀与防护, 2015, 36(4):355-361.
【13】GUEDES SOARES C, GARBATOV Y, ZAYED A. Effect of environmental factors on steel plate corrosion under marine immersion conditions[J]. Corrosion Engineering, Science and Technology, 2011, 46(4):524-541.
【14】HU J Y, CAO S A, YIN L, et al. Electrochemical study on the corrosion of rusted carbon steel in dilute NaCl solutions[J]. Anti-Corrosion Methods and Materials, 2014, 61:139-145.
【15】程浩力, 刘德俊. A3、20#和X70钢室内模拟流动海水腐蚀试验[J]. 腐蚀与防护, 2012, 33(3):212-215.
【16】吴善宏, 肖丽, 尹力, 等. 带锈层碳钢在3% NaCl溶液中的腐蚀电化学行为[J]. 腐蚀与防护, 2013, 34(9):811-814.
【17】刘露露, 邹帅, 万冬阳, 等. 冲刷速度和温度对低碳钢在海水中冲蚀行为的影响[J]. 山东化工, 2015, 44(21):15-16.
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