La3+对Zn-Fe合金镀层在硫酸溶液中腐蚀行为的影响

doi:10.3969/j.issn.0253-2778.2010.07.009

中国科学技术大学学报 ›› 2010, Vol. 40 ›› Issue (7): 712-717.DOI: 10.3969/j.issn.0253-2778.2010.07.009

La3+对Zn-Fe合金镀层在硫酸溶液中腐蚀行为的影响

鲁道荣

合肥工业大学化工学院，可控化学与材料化工安徽省重点实验室，安徽合肥 230009

收稿日期:2010-01-21 修回日期:2010-06-05 出版日期:2010-07-31 发布日期:2010-07-31
通讯作者: 鲁道荣
作者简介:鲁道荣(通讯作者)，女，1953年生，硕士/教授. 研究方向：电化学工程. E-mail:ldr.897@163.com
基金资助:
合肥市科研计划项目（2008026D14）资助.

Effect of La3+ on corrosion behavior of Zn-Fe alloy coating in sulfuric acid solution

LU Daorong

Anhui Key Laboratory of Controllable Chemical Reaction & Material Chemical Engineering, College of Chemical Engineering, HeFei University of Technology, Hefei 230009, China

Received:2010-01-21 Revised:2010-06-05 Online:2010-07-31 Published:2010-07-31

摘要/Abstract

摘要： 电镀液中加入镧盐，在A3钢表面电镀Zn-Fe合金薄膜，选择酸性腐蚀介质，研究La3+对Zn-Fe合金镀层腐蚀行为的影响.用线性扫描伏安法和交流阻抗法，研究Zn-Fe合金镀层在30 ℃的020 mol ·L-1 H2SO4 溶液中的腐蚀行为.用XRD和SEM研究Zn-Fe合金镀层在腐蚀前后的微观结构和形貌的变化.结果表明：加入镧盐，不改变Zn-Fe合金镀层的晶面择优取向，但影响各晶面衍射峰强度，使镀层结晶粒度变小；当加入La2(SO4)3为090 g·L-1时，Zn-Fe合金镀层变得致密均匀，电结晶生长形态呈现层状；镀层的致钝电流密度（Jpp）和维钝电流密度（Jp）显著降低，极化电阻Rp增大，镀层具有良好的耐蚀性能.

关键词: 镧盐, 电镀, Zn-Fe合金镀层, 耐蚀性, 硫酸溶液

Abstract: The effects of Lanthanum ions on the corrosion behavior of Zn-Fe alloy coating in acid corrosion solution，which was electroplated on the surface of A3 steel substrate with various electrolytes of Lanthanum salt，were investigated. The corrosion behavior of the Zn-Fe alloy coating was studied by the Linear sweep voltammetry and AC impedance in the 020 mol·L-1 sulfuric acid solution at 30 ℃. The microstructure and shape of Zn-Fe alloy coating before and after corrosion was studied by XRD and SEM. The results indicate that the addition of lanthanum salt decreases the grain size of Zn-Fe alloy coating and retains the preferred orientation of Zn-Fe alloy coatings, but affects the intensity of diffraction for crystal planes. When 090 g·L-1 La2(SO4)3 is added in the electrolytes, the coatings of Zn-Fe alloy are more uniform and compact, and the electrocrystallization appears layered. The Jpp and Jp of Zn-Fe alloy coating are reduced evidently, Rp is increased, and the Zn-Fe alloy coating has better corrosion resistance.

Key words: lanthanum salt, electroplating, Zn-Fe alloy coating, corrosion resistance, sulfuric acid solution

鲁道荣，王靓靓. La3+对Zn-Fe合金镀层在硫酸溶液中腐蚀行为的影响[J]. 中国科学技术大学学报, 2010, 40(7): 712-717.

LU Daorong, WANG Liangliang. Effect of La3+ on corrosion behavior of Zn-Fe alloy coating in sulfuric acid solution[J]. Journal of University of Science and Technology of China, 2010, 40(7): 712-717.

La3+对Zn-Fe合金镀层在硫酸溶液中腐蚀行为的影响

Effect of La3+ on corrosion behavior of Zn-Fe alloy coating in sulfuric acid solution

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