20CrMnTi钢在海洋环境中的腐蚀行为  

Corrosion Behavior of 20CrMnTi Steel in Marine Environment

作　　者：吴正江[1] 刘贻欧[1] 赖奇暐 张宇[1] 李冬冬 WU Zhengjiang;LIU Yiou;LAI Qiwei;ZHANG Yu;LI Dongdong(Wuhan Second Ship Design&.Research Institute,Wuhan 430064,China;Wuhan Material Protection Research Institute Co.,Ltd.of China National Machinery Engineering Corporation,Wuhan 430030,China)

机构地区：[1]武汉第二船舶设计研究所,武汉430064 [2]中国机械总院集团武汉材料保护研究所有限公司,武汉430030

出　　处：《腐蚀与防护》2023年第5期28-33,40,共7页Corrosion & Protection

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/cm^(2),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78.66μm/a,在盐雾/干/湿交替循环腐蚀试验中腐蚀速率为2830.27μm/a,与05Cr17Ni4Cu4Nb不锈钢偶连时,20CrMnTi钢在人造海水中的腐蚀速率为286.42μm/a,在三亚实海中的腐蚀速率为310.06μm/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。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/cm^(2)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 2830.27μm/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 310.06μm/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.

关 键 词：20CRMNTI钢 海洋环境 腐蚀 

分 类 号：TG172.5[金属学及工艺—金属表面处理]