前处理对6063铝合金材料表面微观特性及耐丝状腐蚀性能的影响
Effect of Pretreatment on Surface Micro-Characteristics and Filiform Corrosion Resistance of 6063 Aluminum Alloy
摘 要
通过不同的前处理方法对6063铝合金进行表面调控前处理, 采用SEM、EDS、AFM分别对铝合金表面的微观形貌、成分与电势分布进行研究; 采用电化学动电位扫描与电化学阻抗技术对铝合金材料的丝状腐蚀速率进行了研究。微观分析发现碱蚀后再经含氟离子溶液酸蚀处理可以减少铝合金表面第二相数量, 提高合金材料耐蚀性; 电化学试验结果表明, 该处理可降低铝合金材料的丝状腐蚀电流, 并且在电化学阻抗谱中具有较小的双电层电容(Cdl)与较大的电荷迁移电阻(Rct), 而单一的混合溶液酸蚀前处理不能降低铝合金材料的丝状腐蚀速率。
前处理
微观特性
丝状腐蚀
aluminum alloy
pretreatment
micro-characteristic
filiform corrosion
Abstract
Different pretreatment methods were applied to modify the 6063 aluminum alloy surface, and scanning electrion microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and atomic force microscopy (AFM) were respectively used to study the micro-morphology, composition and potential distribution of the aluminum alloy surface, in addition, potentiodynamic polarization curve and electrochemical impendence spectroscopy (EIS) were also used to compare the filiform corrosion rate of the different surface-pretreated 6063 aluminum alloy. It was found that the pretreatment in the F- containing acid solution after etching in the alkaline solution could decrease the second phase amount in the alloy surface and make a devotion to improve the corrosion resistance. As a result of surface modification in the optimized solutions, the fillform corrosion current was lowered, and the painted aluminium alloy had the minimum double-layer capacitance (Cdl) and maximum electronic transfer resistance (Rct) in the EIS, while pretreatment in the mixed acid solution was unable to decrease the fillform corrosion rate.
中图分类号 TG174.4 TB37 DOI 10.11973/fsyfh-201510010
所属栏目 试验研究
基金项目 教育部重点科技创新项目(211129); 广东省自然科学基金(s2012010010244 ); 佛山市科技创新专项(2014AG10009)
收稿日期 2014/10/18
修改稿日期
网络出版日期
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备注陈东初(1972-), 教授, 博士, 从事金属腐蚀与防护研究,
引用该论文: YANG Huan,CHEN Dong-chu,YIN Shi-hen,PAN Xue-zhu,YE Shu-lin,WAN Bin. Effect of Pretreatment on Surface Micro-Characteristics and Filiform Corrosion Resistance of 6063 Aluminum Alloy[J]. Corrosion & Protection, 2015, 36(10): 947
被引情况:
【1】左玉婷,杜凤贞,夏 雯,刘淑凤,刘安生,张智慧, "铝合金散热器腐蚀失效分析",腐蚀与防护 37, 1018-1022(2016)
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参考文献
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【2】ZAID B, SAID D, BENZAID A, et al. Effects of pH and chloride concentration on pitting corrosion of AA6061 aluminum alloy[J]. Corrosion Science, 2008, 50(7): 1841-1847.
【3】CEYLAN S, SERGIY B, MARTIN S, et al. In situ detection of differences in the electrochemical activity of Al2Cu IMPs and investigation of their effect on FFC by scanning Kelvin probe force microscopy[J]. Corrosion Science, 2012, 58: 307-314.
【4】田秀云, 杜洪曾, 吴志巨. MD-82型飞机蒙皮的丝状腐蚀与防腐改进措施[J]. 民用飞机设计与研究, 2004(2): 46-49.
【5】朱祖芳. 建筑铝型材聚合物膜下的丝状腐蚀[J]. 腐蚀与防护, 1999, 20(6): 255-256.
【6】赵月红, 林乐耘. 不同加工及表面处理状态LF6铝镁合金的深海腐蚀行为[J]. 中国有色金属学报, 2001, 11(S1): 27-30.
【7】陈明安, 张新明, 蒋志军, 等. 铝及铝合金表面处理后的表面特征和粘接特性[J]. 化学与粘合, 2001(6): 262-264.
【8】LUNDERA O, OLSENB B, NISANCIOGLUB K. Pre-treatment of AA6060 aluminium alloy for adhesive bonding[J]. International Journal of Adhesion & Adhesives, 2002, 22: 143-150.
【9】FABIAN E, THOMAS S, PETER J U, et al. In situ monitoring of corrosion processes within the bulk of AlMgSi alloys using X-ray microtomography[J]. Corrosion Science, 2008, 50: 3455-3466.
【10】MOL J M C, HINTON B R W D H, VAN D W, et al. A filiform corrosion and potentiodynamic polarisation study of some aluminium alloys[J]. Journal of Material Science, 2000, 35: 1629-1639.
【11】FEDRIZZI L, BIANCHI A, DEFLORIAN F, et al. Effect of chemical cleaning on the corrosion behaviour of painted aluminium alloys[J]. Electrochimica Acta, 2002, 47: 2159-2168.
【12】MOL J M C, LANGKRUIS J V, WIT J H W, et al. An integrated study on the effect of pre-and post-extrusion heat treatments and surface treatment on the filiform corrosion properties of an aluminium extrusion alloy[J]. Corrosion Science, 2005, 47(11): 2711-2730.
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