EIS investigation on Al 5052 alloy surface preparation for self-assembling monolayer
EIS investigation on Al 5052 alloy surface preparation for self-assembling monolayer
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DOI：
10.1016/j.electacta.2005.02.118
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发表时间：
2006-01
影响因子：
6.6
通讯作者：
F. M. Reis;H. G. Melo;I. Costa
中科院分区：
文献类型：
--
作者：
F. M. Reis;H. G. Melo;I. Costa
环境的限制导致了对环境友好的无铬处理的研究，以取代铬酸盐。近年来，自组装单层膜（SAM）在不同金属表面的防腐蚀研究取得了可喜的成果。本文用电化学阻抗谱研究了表面处理对SAM处理的Al 5052合金在自然通气的0.5M Na_2SO_4溶液（pH 4）中电化学行为的影响。比较了三种不同表面处理的效果：（A）碱清洗;（B）碱清洗后SAM处理;（C）碱清洗后酸蚀刻后SAM处理。结果表明，在清洗后进行的酸蚀刻步骤对Al 5052合金随后用SAM工艺处理时的腐蚀行为具有有利的影响。
Environmental restrictions are leading to the research for environmentally friendly Cr-free treatments to substitute chromatizing. Recently, promising results have being reported for the corrosion protection offered by self-assembly monolayer (SAM) on different metals. In the present work, the influence of surface preparation on the electrochemical behaviour of SAM-treated Al 5052 alloy in naturally aerated 0.5M Na2SO4solution (pH 4) has been investigated using EIS. The effects of three different surface treatments were compared: (A) alkaline cleaning; (B) alkaline cleaning followed by SAM treatment; (C) alkaline cleaning followed by acid etching and then SAM treatment. The results indicate that the acid-etching step, carried out after cleaning had a favourable effect on the corrosion behaviour of the Al 5052 alloy when it is subsequently treated with SAM process.