模拟沿海工业大气环境中2A12铝合金的加速腐蚀行为
Accelerated Corrosion Behaviors of Aluminum Alloy 2A12 in Simulated Coastal Industrial Atmosphere Environment
摘 要
采用盐雾试验、失重法、SEM、EDS和电化学分析等方法，在以模拟沿海工业大气环境（0.2% NaHSO3+5% NaCl以及0.4% Na2S2O8+5% NaCl）中，研究了变电站用2A12铝合金材料的加速腐蚀行为。结果表明：2A12铝合金在两种腐蚀性盐雾中均发生明显的局部腐蚀，Na2S2O8具有显著的去极化作用，使阴极电流密度升高，腐蚀产物中的AlCl3及硫酸盐等的含量增加；合金表面钝化膜在0.4% Na2S2O8+5% NaCl中的稳定性明显降低，腐蚀速率增大，可以取得良好的加速腐蚀效果。
沿海工业大气
2A12铝合金
加速腐蚀行为
atmospheric corrosion
simulated coastal industrial atmosphere
aluminum alloy 2A12
accelerated corrosion behavior
Abstract
Salt spray experiment, weight loss method, SEM, EDS and electrochemical analysis were used to study the accelerated corrosion behavior of electrician aluminum alloy 2A12 in simulated coastal industrial atmosphere with 0.2% NaHSO3+5% NaCl and 0.4% Na2S2O8+5% NaCl as corrosion media. The results show that the electrician aluminum alloy had obvious localized corrosion in the two corrosive salt sprays. Na2S2O8 had a significant depolarization effect, so that the cathode current density increased, the content of AlCl3 and sulfate in corrosion products increased. The stability of passivation film on the surface of aluminum alloy in 0.4% Na2S2O8+5% NaCl was obviously reduced, the corrosion rate was increased, and a good accelerated corrosion effect could be obtained.
中图分类号 TG172.3 DOI 10.11973/fsyfh-202104004
所属栏目 试验研究
基金项目 长沙市重点研发计划（kq1801061）
收稿日期 2019/7/24
修改稿日期
网络出版日期
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引用该论文: ZHAO Fei,JIN Dong,LI Hongying. Accelerated Corrosion Behaviors of Aluminum Alloy 2A12 in Simulated Coastal Industrial Atmosphere Environment[J]. Corrosion & Protection, 2021, 42(4): 19
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【4】毛海荣,黄少仪,章蔷英. 全国大气腐蚀网站大气腐蚀介质浓度变化分析[J]. 环境技术,2000,18(6):6-9.
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【7】刘艳洁,王振尧,柯伟. 纯Al在3种典型沿海、工业和乡村大气中的腐蚀行为[J]. 中国腐蚀与防护学报,2016,36(1):47-51.
【8】张腾,何宇廷,高潮,等. 2A12-T4铝合金长期大气腐蚀损伤规律[J]. 航空学报,2015,36(2):661-671.
【9】蒋以奎. 输变电设备及线路大气环境腐蚀性检测及金属腐蚀研究[D]. 上海:上海电力学院,2016.
【10】郝美丽,曹学军,封先河,等. 铝合金室内加速腐蚀与大气暴露腐蚀的相关性[J]. 兵器材料科学与工程,2006,29(5):28-31.
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