Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第25卷    第6期    总第195期    2015年6月

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文章编号:1004-0609(2015)06-1417-11
6061铝合金与30CrMnSiA结构钢在模拟工业-海洋大气环境下的电偶腐蚀防护
冯 驰1, 2, 3,黄运华1, 2,申玉芳3,肖 葵1, 2,孟凡彰1, 2,李晓刚1, 2

(1. 北京科技大学 腐蚀与防护中心,北京 100083;
2. 北京科技大学 腐蚀与防护教育部重点实验室,北京 100083;
3. 桂林理工大学 有色金属及材料加工新技术教育部重点实验室 材料科学与工程学院,桂林 541004
)

摘 要: 重点研究6061铝合金和30CrMnSiA结构钢在模拟工业-海洋环境下的电偶腐蚀防护。以表面阳极氧化及有机涂层处理的6061铝合金、表面镀镉及涂层处理的30CrMnSiA结构钢为实验材料,将试样装配成标准电偶试样,对其进行氙灯老化和周期浸润实验,并对腐蚀后的试样进行分析。结果表明:仅采用表面阳极氧化处理的6061铝合金的强度σb和塑性δ损失较大,σb和δ分别下降了约24.2%和13.4%。而采用环氧聚酰胺底漆和丙烯酸聚氨酯面漆的复合防护涂层的6061铝合金强度和塑性损失较小,σb和δ分别下降约4%和5%。且无涂层试样的平均点蚀坑深度明显大于有涂层试样的,最高相差32 μm,表明此涂层可减弱电偶腐蚀。

 

关键字: 6061铝合金;30CrMnSiA结构钢;大气腐蚀;电偶腐蚀;有机涂层;力学性能

Galvanic corrosion and protection of 6061 aluminum alloy coupled with 30CrMnSiA steel in simulative industry-marine atmospheric environment
FENG Chi1, 2, 3, HUANG Yun-hua1, 2, SHEN Yu-fang3, XIAO Kui1, 2, MENG Fan-zhang1, 2, LI Xiao-gang1, 2

1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;
2. Key Laboratory for Corrosion and Protection, Ministry of Education, University of Science and Technology Beijing,
Beijing 100083, China;
3. Key Laboratory of Processing Technology for Nonferrous Metals and Materials, Ministry of Education, School of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China

Abstract:The galvanic corrosion and protection of 6061 aluminum alloy coupled with 30CrMnSiA steel in simulative industry-marine atmospheric environment was studied. The anodized and organic coated 6061 aluminum alloy and cadmium-plated and organic coated 30CrMnSiA steel were assembled into standard galvanic samples. After xenon lamp aging and alternate immersion, the mechanical properties and microstructures of the samples were investigated. The results show that the strength (σb) and toughness (δ) of the anodized 6061 aluminum alloy decrease obviously, σb and δ decrease by about 24.2% and 13.4%, respectively. However, σb and δ of 6061 aluminum alloy coated with acrylic polyurethane and epoxy polyamide resin composite decrease slightly, only about 4% and 5%, respectively. In addition, the average pitting corrosion depth of the uncoated samples is significantly greater than that of samples with coating, and the maximum difference of the depth is about 32 μm. Therefore, the galvanic corrosion can be reduced by organic coating.

 

Key words: 6061 aluminum alloy; 30CrMnSiA steel; atmospheric corrosion; galvanic corrosion; organic coating; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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