La3+对Zn-Fe合金镀层耐蚀性能的影响
Effect of La3+ on Corrosion Resistance of Zn-Fe Alloy Coating
摘 要
在A3钢表面Zn-Fe合金电镀液中加入镧盐,研究La3+对Zn-Fe合金镀层在酸性介质中腐蚀行为的影响.用线性扫描伏安法和电化学阻抗法,研究Zn-Fe合金镀层在30 ℃的0.20 mol/L 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,加入镧盐没有改变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0.90 g/L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(ipp)和维钝电流密度(ip)显著降低,极化电阻Rp增大,镀层具有良好的耐蚀性能.
电镀
Zn-Fe合金镀层
耐蚀性
硫酸溶液
lanthanum salt
electroplating
Zn-Fe alloy coating
corrosion resistance
sulfuric acid solution
Abstract
The effect of La3+ on the corrosion behavior of Zn-Fe alloy coating in acid solution were investigated.The corrosion behavior of Zn-Fe alloy coating was studied by the linear sweep voltammetry and AC impedance in 0.20 mol/L sulfuric acid solution at 30 ℃.The microstructure of Zn-Fe alloy coating before and after corrosion was studied by XRD and SEM.The results indicated that the grain size of Zn-Fe alloy coating turned smaller,the preferred orientation of Zn-Fe alloy coatings were not changed and the intension of diffraction for crystal planes were affected after adding lanthanum salt.When 0.90 g/L La2(SO4)3 was added into the electrolytes,the coatings of Zn-Fe alloy were more uniform and close together,and the shape of electrocrystallization turned to layer.The ipp and ip of Zn-Fe alloy coating were reduced evidently,Rp was increased,and the Zn-Fe alloy coating had better corrosion resistance.
中图分类号 TG174.44
所属栏目 应用技术
基金项目 合肥市科技项目(080326D14)
收稿日期 2010/2/5
修改稿日期 2010/3/3
网络出版日期
作者单位点击查看
联系人作者鲁道荣(ldr.897@163.com)
备注鲁道荣,教授.
引用该论文: WANG Liang-liang,LU Dao-rong. Effect of La3+ on Corrosion Resistance of Zn-Fe Alloy Coating[J]. Corrosion & Protection, 2010, 31(12): 966～969
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【9】王晓秋,丁伟中,王新国,等.混合稀土对ZL108铝合金组织与性能的影响[J].中国稀土学报,2004,22(2):243.
【10】章江洪,张英杰,陈阵,等.稀土铈在锌-铁合金电沉积中的作用[J].中国稀土学报,2003,21:157-161.
【11】汪兵,刘清友,王向东.稀土Ce和La对碳钢在NaCl溶液中的缓蚀机理[J].中国腐蚀与防护学报,2007,27(3):151-155.
【12】曹超,鲁道荣.钒对Zn-Fe合金镀层耐蚀性的影响[J].材料保护,2007,40(8):12-16.
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