Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第22卷    第6期    总第159期    2012年6月

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文章编号:1004-0609(2012)06-1616-08
Cu2+及等离子电解氧化处理对Zr-4合金腐蚀性能的影响
程英亮,伍  帆

(湖南大学 材料科学与工程学院,长沙 410082)

摘 要: 采用电化学方法研究锆合金Zr-4在添加不同Cu2+浓度的0.5 mol/L NaCl溶液或0.5 mol/L Na2SO4中的腐蚀行为,探讨不同浓度Cu2+对Zr-4合金腐蚀性能的影响,同时,在10 g/L Na2SiO3·9H2O+10 g/L Na4P2O7·10H2O混合溶液中对Zr-4合金进行等离子电解氧化处理,并用极化曲线技术研究膜层的防护能力。结果表明:Cu2+能使Zr-4合金自腐蚀电位正移,降低极化曲线上钝化区的宽度,使得合金的抗孔蚀能力降低,腐蚀电流密度增加;在硫酸钠溶液中,Cu2+的添加没有使合金产生明显的孔蚀,这表明Zr-4合金的抗孔蚀能力下降是Cu2+和Cl共同作用的结果;等离子电解氧化处理能够大幅度提高Zr-4合金的抗孔蚀能力。

 

关键字: Zr-4合金;Cu2+;孔蚀;等离子电解氧化

Effects of Cu2+ and plasma electrolytic oxidation on corrosion properties of zircaloy-4 alloy
CHENG  Ying-liang, WU Fan

College of Materials Science and Engineering, Hunan University, Changsha 410082, China

Abstract:The corrosion behavior of zicaloy-4 alloy in 0.5 mol/L NaCl+CuCl2 solution and 0.5 mol/L Na2SO4+CuSO4 solution was studied by electrochemical methods, and the effect of the concentration of Cu2+ on the corrosion behavior of zicaloy-4 alloy was discussed, meanwhile, plasma electrolytic oxidation(PEO) was carried out on the zircaloy-4 alloy in the electrolyte of 10 g/L Na2SiO3·9H2O+10 g/L Na4P2O7·10H2O, and the protection ability of the PEO coatings was evaluated by potentiodynamic polarization curves. The results show that that Cu2+ can shift the corrosion potential of the zircaloy-4 alloy toward the positive direction and narrows the scope of the passive region on the polarization curves, as a result, the resistance of the alloy to pitting corrosion decreases and the corrosion current density increases. In the solution of Na2SO4, the addition of Cu2+ does not result in obvious pitting corrosion of the alloy, manifesting that the decrease of the pitting resistance of the zircaloy-4 is the synergetic effect of Cu2+ and Cl. PEO treatment can greatly enhance the pitting resistance of the zircaloy-4 alloy.

 

Key words: zircaloy-4 alloy; Cu2+; pitting; plasma electrolytic oxidation

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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