梁明辉,吴向清,谢发勤,李正,何鹏,贺栋栋,王少青.Cl–浓度对阳极氧化5A06铝合金/1Cr18Ni9Ti不锈钢偶接件腐蚀行为的影响[J].表面技术,2022,51(7):161-168.
LIANG Ming-hui,WU Xiang-qing,XIE Fa-qin,LI Zheng,HE Peng,HE Dong-dong,WANG Shao-qing.Effect of Cl– Concentration on Corrosion Behavior of Anodized 5A06 Aluminum Alloy/1Cr18Ni9Ti Stainless Steel Coupling[J].Surface Technology,2022,51(7):161-168 |
| Cl–浓度对阳极氧化5A06铝合金/1Cr18Ni9Ti不锈钢偶接件腐蚀行为的影响 |
| Effect of Cl– Concentration on Corrosion Behavior of Anodized 5A06 Aluminum Alloy/1Cr18Ni9Ti Stainless Steel Coupling |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.07.015 |
| 中文关键词: 阳极氧化 5A06铝合金 电偶腐蚀 Cl–浓度 点蚀 |
| 英文关键词:anodic oxidation 5A06 aluminum alloy galvanic corrosion Cl– concentration pitting |
| 基金项目:国家自然科学基金(52001256);陕西省自然科学基础研究计划重点项目(2021JM055) |
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| Author | Institution |
| LIANG Ming-hui | School of Civil Aviation, Northwestern Polytechnical University, Xi’an 710072, China |
| WU Xiang-qing | School of Civil Aviation, Northwestern Polytechnical University, Xi’an 710072, China |
| XIE Fa-qin | School of Civil Aviation, Northwestern Polytechnical University, Xi’an 710072, China |
| LI Zheng | National Key Laboratory of Special Technology on UAV, Northwestern Polytechnical University, Xi’an 710065, China |
| HE Peng | School of Civil Aviation, Northwestern Polytechnical University, Xi’an 710072, China |
| HE Dong-dong | School of Civil Aviation, Northwestern Polytechnical University, Xi’an 710072, China |
| WANG Shao-qing | School of Civil Aviation, Northwestern Polytechnical University, Xi’an 710072, China |
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| 中文摘要: |
| 目的 研究阳极氧化铝合金/1Cr18Ni9Ti不锈钢偶接的电偶腐蚀机理及Cl–浓度对其腐蚀行为的影响规律，为铝合金在不同服役环境中的腐蚀与防护提供依据。方法 通过电偶腐蚀实验，在不同Cl–浓度下偶接阳极氧化5A06铝合金和1Cr18Ni9Ti不锈钢，根据腐蚀电流的变化规律分析、表面腐蚀形貌与成分的表征、并结合电化学测试，分析了Cl–浓度对阳极氧化5A06铝合金的电偶腐蚀行为的影响。结果 随着腐蚀时间的延长，电偶电流呈现锯齿状波动，总体表现为由高到低逐渐趋于稳定。电偶电流随着Cl–质量分数的变化表现为3.5%>5%>2%>6.5%>8%>0.5%，且当Cl–质量分数为3.5%时电偶电流最大为16.56 μA/cm2。结论 电偶腐蚀过程中5A06铝合金阳极氧化膜表面的腐蚀产物对点蚀坑产生堵塞，阻碍了溶液中Cl–进一步和基体发生反应，阳极氧化膜表现为破坏—修复—破坏的循环往复过程;溶液中Cl–既可以促进铝合金阳极氧化膜的溶解，增加铝合金电偶腐蚀的敏感性，也会降低溶液中溶解氧的浓度从而抑制阳极反应发生。当Cl–质量分数<3.5%时其促进溶解作用大于抑制反应作用，而当Cl–质量分数>3.5%时其抑制反应作用大于促进溶解作用，因此电偶腐蚀速率随着Cl–浓度的增大呈现先增大后减小的规律。 |
| 英文摘要: |
| The work aims to study the galvanic corrosion mechanism of anodized 5A06 aluminum alloy/1Cr18Ni9Ti stainless steel coupling and the effect of Cl– concentration on its corrosion behavior, It provides a basis for the corrosion and protection of aluminum alloy in different service environments. The galvanic corrosion experiments of anodized 5A06 aluminum alloy and 1Cr18Ni9Ti stainless steel were set at different Cl– concentrations. The effect of Cl–concentration on the corrosion behavior of anodized 5A06 aluminum alloy was discussed, according to the analysis of the change law of the corrosion current, the characterization of the surface corrosion morphology and composition, and the electrochemical test. With the increasing of corrosion time, the galvanic current fluctuated zigzag and gradually decreases and then tended to be stable. The variation of galvanic current with Cl– concentration was 3.5%>5%>2%>6.5%>8%>0.5%，When the Cl– concentration was 3.5%, the maximum galvanic current was 16.56 μA/cm2. In the process of galvanic corrosion, the corrosion products on the surface of 5A06 aluminum alloy anodic oxide film block the pitting pits, hinder the further reaction of Cl– with substrate in solution. The anodic oxide film shows a cyclic process of destructing-repairing-destructing; Cl– can not only promote the dissolution of anodic oxide film of aluminum alloy, increase the sensitivity of galvanic corrosion of aluminum alloy, but also reduce the concentration of dissolved oxygen in solution, which help to inhibit the occurrence of anodic reaction. When the concentration of Cl– is less than 3.5%, the effect of promoting dissolution is greater than that of inhibiting reaction, and when the concentration of Cl– is more than 3.5%, the effect of inhibiting reaction is more obvious than that of promoting dissolution. Therefore, The galvanic corrosion rate increases first and then decreases with the increase of Cl– concentration。 |
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