铈盐对铝合金的缓蚀机理研究

中国腐蚀与防护学报

2006, Vol. 26

Issue (1): 53-58

研究报告

本期目录 | 过刊浏览

铈盐对铝合金的缓蚀机理研究

顾宝珊;刘建华;纪晓春

北京钢铁研究总院

Corrosion Inhibiton Mechanism of Cerium(III) for Aluminum Alloy

Baoshan Gu;Jianhua Liu;Xiaochun Ji

北京钢铁研究总院

全文: PDF(242 KB)

摘要: 应用分离电解池（the split cell）技术将阴阳极分离，通过测定因溶液中氧含量改变和添加CeCl3导致两电极之间的净电流的变化，研究了CeCl3对B95超强铝合金在01 mol/L NaCl溶液中腐蚀行为的影响，并用扫描电子显微镜(SEM)和X射线能量散射谱(EDS)表征电极表面的形貌特征，结合其它电化学技术如电位－时间曲线、极化曲线等手段，对Ce盐缓蚀机理作了深入探讨.结果表明，经Ce盐处理的B95超强铝合金表面可形成一层不均匀分布的转化膜，成膜动力学包括铝合金的溶解及随后的成膜两个过程；铝合金Ce化学转化膜主要由Ce、O、Al组成；35%NaCl溶液全浸试验表明添加CeCl3后腐蚀率可降低数百倍，铝合金的耐蚀性能大大提高，CeCl3表现为一种优良的铝合金缓蚀成膜剂.

关键词 ： Al合金, Ce转化膜, 缓蚀机理, 分离电池

Abstract：By using a split cell to separate anode and cathode as well as measuring the change of net-electric current between the two electrodes caused by the change of the amount of oxygen in the solution and the addition of CeCl3.The influence of CeCl3 on corrosion behavior of B95 super-strength aluminum alloy in the 0.1 mol/L NaCl solution was studied.Meanwhile,a further discussion about Ce salt inhibition mechanism was carried out by revealing the features of electrode surface with the help of SEM and X-ray energy-dispersive spectrometry (EDS) and resorting to other electric chemical techniques,such as potential-time curve,polarization curve and so on .The results showed that alayer of uneven conversion coatings could appear on the surface of B95 alloy after being dealt with by Ce salt;the dynamics of coating-formation involved two stages:the solution of aluminum alloys and coating-formation fterwards;the cerium conversion coatings were mainly composed of Ce,O and Al elements;the experiment with completely submerging into the solution of 3.5% NaCl showed that the corrosion rate of B95 could be reduced by several hundre d times and the anti-corrosion performance of aluminum alloys improved greatly when CeCl3 were added to the solution.As a result CeCl3 proves to be an excellent coating-formation material and aluminum alloy corrosion inhibitor.

Key words： Aluminium alloys Cerium conversion coatings Inhibiton mechanism Split cell

收稿日期: 2004-11-12

ZTFLH:

O646.6

通讯作者: 顾宝珊 E-mail: gubs@263.net

Corresponding author: Baoshan Gu E-mail: gubs@263.net

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引用本文:

顾宝珊; 刘建华; 纪晓春 . 铈盐对铝合金的缓蚀机理研究[J]. 中国腐蚀与防护学报, 2006, 26(1): 53-58 .
Baoshan Gu, Jianhua Liu, Xiaochun Ji. Corrosion Inhibiton Mechanism of Cerium(III) for Aluminum Alloy. J Chin Soc Corr Pro, 2006, 26(1): 53-58 .

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2006/V26/I1/53

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