Molybdate Pro-teatment for Rear Earth Conversion film on LF21 Aluminum Alloy to Improve Corrosion Resistance
摘 要
用化学沉积法在LF21铝合金表面制备了均匀连续的稀土铈化学转化膜,通过电镜、能谱、极化曲线测试和盐雾试验等方法研究了膜的开裂行为以及钼酸盐后处理对膜耐蚀性能的改善作用.结果表明,沉积时间对膜的开裂倾向有显著影响,随沉积时间延长,开裂倾向增大,裂纹更深更宽.在10 g/L的钼酸钠溶液、50 ℃、浸泡30 min的条件下对稀土转化膜进行后处理以后,裂纹程度有所减弱,耐蚀性能明显改善,维钝电流下降约一个数量级,耐盐雾性能也明显提高.钼酸盐后处理提高稀土转化膜耐蚀性的机理可能包括钼酸盐膜在裂纹部位的沉积、钼酸盐的缓蚀作用和稀土转化膜的“自封闭”作用.
Abstract
Cerium conversion film was prepared on LF21 aluminum alloy by chemical deposition,and the cracking behavior and improvement of corrosion resistance of the film by molybdate pro-treatment were studied with methods of SEM,EDX,polarization testing and salt fog testing.The results show that deposition time had significant influence on cracking of the film.With the deposition time prolonged,cracking tendency of the film increased and the cracks were wider and deeper.After the film was treated in 10 g/L molybdate solution at 50 ℃ for 30 minutes,the cracking degree was alleviated and corrosion resistance of the film was increased.The passive current density decreased by almost an order of magnitude and the property to resist salt fog testing was also improved.The mechanisms for molybdate treatment to improve corrosion resistance may include the deposition of molybdate film at cracking sites,the inhibitive effect of molybdate and the “self sealing” effect of cerium conversion film.
中图分类号 TG178
所属栏目 试验研究
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收稿日期 2008/4/3
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引用该论文: LI Wen-gang,ZHANG Xiao-feng,LU Qin-Xiu,ZUO Yu. Molybdate Pro-teatment for Rear Earth Conversion film on LF21 Aluminum Alloy to Improve Corrosion Resistance[J]. Corrosion & Protection, 2009, 30(4): 248~250
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参考文献
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【3】Mansfeld F.Surface modification of aluminum alloys in molten salts containing CeCl3[J].Thin Solid Films,1995,270(1/2):417-421.
【4】Kasten L S,Gant J T, Grebasch N.An XPS study of cerium dopants in solgel coatings for aluminum 2024-T3[J].Surface and Coatings Technology,2001,140:11-15.
【5】李久青,田虹,卢翠英,等.铝合金稀土转化膜碱性成膜工艺T3/T7的研究[J].腐蚀科学与防护技术,1998,10(2):98-102.
【6】李久青.铝合金表面四价铈盐转化膜及其耐蚀性[J].腐蚀科学与防护技术,1996,8(4):271-275.
【7】于兴文.LY12铝合金及A16061/SiCp复合材料表面稀土转化膜的研究[D].哈尔滨工业大学,1999.
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【12】Decroly A,Petitjean J P.Study of the deposition of cerium oxide by conversion on to aluminum alloys[J].Surface and Coatings Technology,2005,194(1):1-9.
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