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史鹏,吕仙姿,张杰,彭中波,邓羽.镍基合金CMSX-4在3.5wt.% NaCl溶液中的腐蚀行为[J].广西科学院学报,2020,36(4):427-433. [点击复制]
- SHI Peng,LV Xianzi,ZHANG Jie,PENG Zhongbo,DENG Yu.Corrosion Behavior of Nickel-based Superalloy CMSX-4 in 3.5 wt.% NaCl Solution[J].Journal of Guangxi Academy of Sciences,2020,36(4):427-433. [点击复制]
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| 镍基合金CMSX-4在3.5wt.% NaCl溶液中的腐蚀行为 |
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史鹏1,2, 吕仙姿1,3,4, 张杰1,2,3,4, 彭中波2, 邓羽1,2
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| (1.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, 山东青岛 266071;2.重庆交通大学航运与船舶工程学院, 重庆 400074;3.海洋科学与技术试点国家实验室, 海洋腐蚀与防护开放工作室, 山东青岛 266237;4.中国科学院海洋大科学研究中心, 山东青岛 266071) |
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| 摘要: |
| 研究二代镍基合金CMSX-4在质量分数为3.5% NaCl溶液中的腐蚀行为，对该类合金在海洋性环境条件下的应用具有深远意义。通过动电位极化方法研究室温条件下镍基合金CMSX-4在3.5 wt.% NaCl溶液中的电化学行为，利用扫描电子显微镜（SEM）、能谱分析仪（EDS）和X射线光电子能谱仪（XPS）对合金表面阳极腐蚀产物进行微观形貌观察及成分分析。研究表明，CMSX-4合金具有一定的钝化能力，钝化区间比较宽广；在镍基合金CMSX-4表面上形成的腐蚀产物可大致分为两层，表层主要由Ni （OH）2、Cr （OH）3、Co （OH）2和Al （OH）3等氢氧化物组成，内层主要分布着NiO、Al2O3、CoO、Cr2O3和CrO3等氧化物及组成合金基体的各种金属；由Ni （OH）2和Cr （OH）3等氢氧化物组成的腐蚀产物膜外层能够在腐蚀介质和金属之间产生较好的屏蔽效果；构成腐蚀产物膜内层的NiO、Al2O3、Cr2O3和CrO3等氧化物有利于产物膜内层与外层之间建立一定的空间电荷区，对稳定腐蚀产物内层有很大帮助。研究表明CMSX-4合金在海洋性环境中具有一定的耐蚀性能。 |
| 关键词: 镍基合金 腐蚀 电化学 钝化 腐蚀产物 |
| DOI：10.13657/j.cnki.gxkxyxb.20210115.001 |
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| 基金项目:国家自然科学基金项目（41376003，42076043）和中国科学院战略性先导科技专项（A类）（XDA13040405）资助。 |
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| Corrosion Behavior of Nickel-based Superalloy CMSX-4 in 3.5 wt.% NaCl Solution |
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SHI Peng1,2, LV Xianzi1,3,4, ZHANG Jie1,2,3,4, PENG Zhongbo2, DENG Yu1,2
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| (1.CAS Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Science, Qingdao, Shandong, 266071, China;2.School of Shipping and Ship Engineering, Chongqing Jiaotong University, Chongqing, 400074, China;3.Open Studio for Marine Corrosion and Protection, Pilot National Laboratory for Marine Science and Technology, Qingdao, Shandong, 266237, China;4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, Shandong, 266071, China) |
| Abstract: |
| The study of the corrosion behavior of the 2nd generation nickel-based alloy CMSX-4 in 3.5 wt.% NaCl solution will have far-reaching significance for the application of this alloy under maritime environmental conditions.The electrochemical behavior of nickel-based alloy CMSX-4 in 3.5 wt.% NaCl solution at room temperature was studied by potentiodynamic polarization method.Scanning electron microscopy (SEM),energy dispersive spectrometer (EDS) and X-ray photoelectron spectroscopy (XPS) were used to observe the surface morphology and analyze the composition of the anodic corrosion products formed on the surface of the alloy.The results show that CMSX-4 alloy has certain passivation ability in electrochemical corrosion test,and the passivation region is also relatively broad.The corrosion products formed on the surface of nickel-based alloy CMSX-4 can be roughly divided into two layers,the outer layer is mainly composed of hydroxides of Ni(OH)2,Cr(OH)3,Co(OH)2,Al(OH)3,and the inner layer is mainly distributed with oxides of NiO,Al2O3,CoO,Cr2O3 and CrO3 and various metals that make up the alloy matrix.The outer layer of the corrosion product film composed of hydroxides such as Ni(OH)2 and Cr(OH)3 can produce a better shielding effect between the corrosive medium and the metal.The oxides such as NiO,Al2O3,Cr2O3 and CrO3 that form the inner layer of the corrosion product film are beneficial to the establishment of a certain space charge zone in the inner and outer layers of the product film,which greatly helps to stabilize the inner layer of the corrosion product.It shows that CMSX-4 alloy has certain corrosion resistance in marine environment. |
| Key words: nickel-based alloy corrosion electrochemistry passivation corrosion product |
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