【作者】 叶慧敏； 王秀通； 牛建民； 南有博； 徐慧； 孙好芬；

【Author】 YE Huimin;WANG Xiu-tong;NIU Jianmin;NAN You-bo;XU Hui;SUN Haofen;Key Laboratory of Marine Environmental Corrosion and Bio-fouling,Institute of Oceanology,Chinese Academy of Sciences;Qingdao University of Technology;Center for Ocean Mega-Science,Chinese Academy of Sciences;Shanghai Institute of Shipbuilding Technology;

【机构】 中国科学院海洋研究所,海洋环境腐蚀与生物污损重点实验室； 青岛理工大学环境与市政工程学院； 中国科学院海洋大科学研究中心； 上海船舶工艺研究所；

【摘要】 在开发和利用海洋的过程中异种金属相互接触进而引发电偶腐蚀的情况不可避免。本文针对海洋环境下的电偶腐蚀问题,采用Q235和BFe30-1-1两种金属材料来研究其在海水中腐蚀一个月、两个月、三个月的电偶腐蚀行为,主要通过电化学测试、全浸腐蚀实验对两种金属的自腐蚀和双金属电偶腐蚀进行实验测试;通过体视显微镜、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、X射线衍射仪（XRD）对腐蚀形貌和腐蚀产物元素分布和物相组成进行分析,探讨其腐蚀机理;采用以有限元法为基础的数值模拟仿真技术对Q235和BFe30-1-1两种金属材料进行电偶腐蚀数值仿真模拟。结果表明,通过电化学测试发现铜镍合金与碳钢的开路电位分别为-225mV和-700mV,所以在海水中偶合后Q235作为阳极而加速腐蚀,BFe30-1-1作为偶和阴极而受到保护;通过表面分析表明随时间的增长,在电偶效应作用下Q235加速腐蚀,BFe30-1-1腐蚀被抑制且表面生成一层致密、稳定的钝化膜;由物相组成分析可知,Q235在腐蚀过程中腐蚀产物主要是α-FeOOH、Fe₃O₄和β-FeOOH,BFe30-1-1腐蚀产物为Cu2O和Cu2Cl（OH）3;仿真模拟结果与腐蚀实验后的结果具有良好的一致性。更多还原

【Abstract】 In the process of developing and utilizing the ocean,it is inevitable that dissimilar metals will come into contact with each other,which will cause galvanic corrosion.In this paper,two metal materials,Q235 and BFe30-1-1,are used to study the galvanic corrosion behavior of one month,two months and three months in seawater,and the self-corrosion and bimetallic galvanic corrosion of the two metals are mainly tested by electrochemical test and total immersion corrosion experiment.Stereo microscopy,scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR) and X-ray diffractometer(XRD) were used to analyze the corrosion morphology,element distribution and phase composition of corrosion products,and explore the corrosion mechanism.The numerical simulation technology based on the finite element method was used to simulate the galvanic corrosion of Q235 and BFe30-1-1 metal materials.The results show that the open-circuit potentials of copper-nickel alloy and carbon steel are found to be-225mV and-700mV,respectively,through electrochemical testing,so Q235 accelerates corrosion as an anode after coupling in seawater,and BFe30-1-1 is protected as a coupling and cathode.Surface analysis shows that with the increase of time,Q235 corrosion is accelerated under the action of galvanic effect,the corrosion of BFe30-1-1 is inhibited,and a dense and stable passivation film is formed on the surface.According to the analysis of phase composition,the corrosion products of Q235 are mainly α-FeOOH,Fe3O4 and β-FeOOH,and the corrosion products of BFe30-1-1 are Cu2O and Cu2Cl(OH)3.The simulation results are in good agreement with the results after the corrosion experiment.更多还原