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

您目前所在的位置:首页 - 期刊简介 - 详细页面

中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第24卷    第8期    总第185期    2014年8月

[PDF全文下载]        

    

文章编号:1004-0609(2014)08-2020-06
Al和RE对Zn-Al合金镀层组织和耐蚀性的影响
贺志荣,何 应,刘继拓,解 凯

(陕西理工学院 材料科学与工程学院,汉中723003)

摘 要: 采用烘干溶剂法在Q235钢表面获得Zn-(0.02~5)%Al和Zn-5%Al-0.05%RE(质量分数)合金镀层,用光学显微镜和扫描电镜观察合金镀层的宏观形貌和表面、断面组织形貌,用能谱仪分析合金镀层的合金元素分布,分别用中性盐雾实验和全浸腐蚀实验研究合金镀层的耐腐蚀性能。结果表明,锌浴中Al的质量分数为0.02%时,Zn-Al合金镀层的光亮度最好,随着Al含量增加光亮度下降;Zn-Al基合金镀层中,从外层的h相到接近钢基体的G相中,Zn含量逐渐减少,Fe和Al含量逐渐增加;随着镀浴中Al含量增加,热浸镀Zn-Al合金镀层的腐蚀速率减小;添加稀土元素能提高Zn-Al合金镀层的耐腐蚀性能。

 

关键字: Zn-Al合金;Zn-Al-RE合金;热镀锌;镀层组织;耐腐蚀性能

Effects of Al and RE on microstructure and corrosion resistance of Zn-Al alloy coatings
HE Zhi-rong, HE Ying, LIU Ji-tuo, XIE Kai

School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723003, China

Abstract:The hot-dip galvanizing alloys of Zn-(0.02-5)%Al and Zn-5%Al-0.05%RE (mass fraction) were obtained on the surface of Q235 steel by solvent drying method. The macroscopic morphology, the surface and section microstructures of the alloy coatings were observed by optical microscopy and SEM. The element distribution in the alloy coatings was analyzed by energy disperse spectroscopy, and the corrosion resistance of the alloy coatings was investigated by the neutral salt spray test and full immersion corrosion, respectively. The results show that the coating lightness is excellent when the Al content is 0.02% (mass fraction), and the coating lightness declines with increasing the Al content. The Zn content reduces and the Fe and Al contents increase gradually in the outer h phase and G phase close to the steel substrate. The corrosion rate of the hot-dip galvanizing Zn-Al alloy coating decreases with increasing the Al content in Zn-Al alloy bath. The corrosion resistance can be enhanced with the addition of rare earth elements in the Zn-Al alloy bath.

 

Key words: Zn-Al alloy; Zn-Al-RE alloy; hot-dip galvanizing; coating microstructure; corrosion resistance

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

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

主管:中国科学技术协会 主办:中国有色金属学会 承办:中南大学
湘ICP备09001153号 版权所有:《中国有色金属学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市岳麓山中南大学内 邮编:410083
电 话:0731-88876765,88877197,88830410   传真:0731-88877197   电子邮箱:f_ysxb@163.com