铈对纳米晶锌镀层耐蚀性能的影响
Influence of Ce on Corrosion Resistance of Nanocrystalline Zinc Coating
摘 要
在酸性硫酸盐直流电沉积纳米晶锌镀层的镀液体系中, 引入铈盐后沉积得到新的纳米镀层。运用AES(原子发射光谱)、XRD及SEM等方法表征了含铈纳米晶锌镀层的化学组成与结构, 采用电化学方法研究了铈对纳米晶锌镀层耐腐蚀性能的影响。结果表明, 镀液中加入硫酸亚铈后, 能够沉积得到含有少量铈的纳米晶锌镀层, 并且晶粒也发生了轻微的细化; 与单纯锌镀层相比, 含铈的锌镀层具有更高的耐蚀性能, 其原因在于腐蚀过程中形成了更为致密的、以Zn5(OH)8Cl2·H2O为主的产物层, 且Zn5(OH)8Cl2·H2O的择优取向与纯锌镀层不相同。
纳米晶锌镀层
稀土铈
耐蚀性
direct current electro-deposition
nanocrystalline zinc coating
rare earth cerium
corrosion resistance
Abstract
By adding cerium salt in the acidic sulfate bath used for direct current electrodeposition of nanocrystalline zinc coating, a new nanocrystalline coating was deposited. The composition, morphology and structure of the coating were characterized by Atomic Emission Spectrometry, X-ray diffraction and scanning electron microscopy. The influence of Ce on corrosion resistance of nanocrystalline zinc coating was investigated by electrochemical methods. The results show that with Ce2 (SO4)3·8H2O in the bath, a small amount of Ce can be obtained in the coating and give rise to the grain refinement of zinc deposits. Compared with the pure zinc coating, the one containing Ce has the better corrosion resistance. The improvement of corrosion performance is due to the formation of a denser product layer consisting mainly of Zn5(OH)8Cl2·H2O and its preferred orientation different from that of pure zinc coating.
中图分类号 TG174
所属栏目 试验研究
基金项目 上海大学研究生创新基金(SHUCX112242)
收稿日期 2012/2/22
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备注李谋成, 研究员, 博士生导师,
引用该论文: WU Ming-yu,LI Mou-cheng. Influence of Ce on Corrosion Resistance of Nanocrystalline Zinc Coating[J]. Corrosion & Protection, 2013, 34(2): 129
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参考文献
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【3】赵显欧, 韩青友.稀土改善锌基合金抗蚀性的实验研究[J].中国稀土学报, 1992, 10(3):243-246.
【4】伍玉琴, 李谋成, 辛森森, 等.三种添加剂对纳米晶锌镀层电沉积行为及结构的影响[J].化学学报, 2010, 68(6):531-534.
【5】李士嘉.稀土在水溶液中的电沉积[J].材料保护, 1992, 25(3):23-25.
【6】Juarez B H, Alonso C. Formation of nanocrystalline Zinc on ITO and silicon substrates by electrochemical deposition[J].J Appl Electrochem, 2006, 36(4):499-506.
【7】陈永言, 喻敬贤, 张红.某些氯化钾镀锌添加剂的作用机理[J].电镀与精饰, 2004, 26(4):13-17.
【8】Manov S, Lamazouere A M, Aries L. Electrochemical study of the corrosion behaviour of zinc treated with a new organic chelating inhibitor[J].Corros Sci, 2000, 42(7):1235-1248。.
【9】Deslouis C, Duprat M, Tulet Tournillon C.The cathodic mass transport process during zinc corrosion in neutral aerated sodium sulphate solutions[J].J Electroanal-chem, 1984, 181(1/2):119-136.
【10】Levie R D. On porous electrodes in electrolyte solutions; Capacitance effects[J].Electrochim.Acta.1963, 8(10):751-780.
【11】Park J R, Macdonald D D. Impedance studies of the growth of porous magnetite films on carbon steel in high temperature aqueous systems[J].Corrosion Science.1983, 23(4):295-315.
【12】Li M C, Zeng C L, Luo S Z, et al. Electrochemical corrosion characteristics of type 316 stainless steel in simulated anode environment for PEMFC[J].Electrochim Acta, 2003, 48(8):1735-1742.
【13】da Silva P S G, Costa A N C, Mattos O R, et al. Evaluation of the corrosion behavior of galvannealed steel in chloride aqueous solution and in tropical marine environment [J].J Appl Electrochem, 2006, 363:375-343.
【14】沈品华, 屠振密.电镀锌及锌合金[M].北京, 机械工业出版社, 2001.
【15】辛森森, 李谋成.锌镁镀层在NaCl溶液中的电化学腐蚀行为[J].材料保护, 2011, 44(4):4-6.
【16】Kawafuku J, Katoh J, ToyamaM, et al. Properties of zinc alloy coated steel sheets obtained by continuous vapor deposition pilotline[C]//Michigan, USA:Philadelphia, Proc 5th Automotive Corrsion & Prevention Conference.1991:43-50.
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