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材料导报  2021, Vol. 35 Issue (Z1): 434-437    
  金属与金属基复合材料 |
钢件双镀ZAM合金镀层的组织及耐蚀性
吴长军1,2, 姚利丽1,3, 周志嵩1,3, 薛烽4, 朱晨露1,3
1 江苏兴达钢帘线股份有限公司,泰州 225721
2 常州大学材料科学与工程学院,常州 213164
3 江苏省结构与功能金属复合材料重点实验室,泰州 225721
4 东南大学材料科学与工程学院,南京 211189
Microstructure and Corrosion Resistance of Two-step Hot-dipped ZAM Alloy Coating on Structural Steel
WU Changjun1,2, YAO Lili1,3, ZHOU Zhisong1,3, XUE Feng4, ZHU Chenlu1,3
1 Jiangsu Xingda Steel Tyre Cord Co., Ltd., Taizhou 225721, China
2 School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China
3 Jiangsu Key Laboratory for Structural and Functional Metal Composite Materials, Taizhou 225721, China
4 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
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摘要 为在钢件上获得高耐蚀性的Zn-6Al-3Mg(ZAM)合金镀层,利用双镀方法,将Q235钢经过常规批量镀锌方法预处理后,先在450 ℃纯锌浴中预镀3~30 s,然后于并排放置的450 ℃的Zn-6Al-3Mg合金浴中浸镀5~120 s,利用扫描电镜-能谱仪和电化学分析研究了预镀时间和浸镀时间对双镀ZAM合金镀层组织及耐蚀性的影响。结果表明,双镀ZAM合金可获得表面质量优良的合金镀层,其组织由Fe2Al5-Znx层、FeAl3-Znx+Z(液相凝固组织)层及合金凝固层组成。在ZAM合金浴中浸镀10 s后,预镀锌形成的Fe-Zn化合物层就已被完全侵蚀,转变成FeAl3-Znx+Z层,它能在镀层中稳定存在,其厚度随预镀锌时间的延长而增加。同时,在钢基体与镀层界面上会形成很薄的Fe2Al5-Znx层。Fe2Al5-Znx和FeAl3-Znx+Z层的厚度均不随浸镀时间的延长而增加。此外,电化学分析证实,双镀ZAM合金镀层耐蚀性明显优于纯锌镀层。通过双镀法获得的这种具有FeAl3-Znx+Z层的高耐蚀的ZAM合金镀层将为钢件新镀层开发奠定基础。
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吴长军
姚利丽
周志嵩
薛烽
朱晨露
关键词:  热浸镀  Zn-6Al-3Mg  双镀  镀层  微观组织    
Abstract: To obtain Zn-6Al-3Mg (ZAM) alloy coating, which has high corrosion resistance, the Zn-6Al-3Mg alloy coatings were prepared on Q235 steel by two-step hot-dip method. The Q235 steel, which was pretreated by conventional galvanizing method, was pre-dipped in pure zinc bath at 450 ℃ for 3—30 s and then immersed in ZAM alloy bath for 5—120 s. The influences of pre-dipping time and immersion time on the microstructure and corrosion resistance of the coating were investigated. Experimental results showed that the ZAM alloy coating with excellent surface quality can be obtained by two-step hot-dip method. The coating was composed of Fe2Al5-Znx, FeAl3-Znx+Z (solidification structure of the liquid phase) layer and the solidified ZAM alloy layer, while no Fe-Zn compound existed. After immersing in the ZAM bath for 10 s, the Fe-Zn compounds formed during pre-dipping had been totally corroded and turned to FeAl3-Znx+Z two phases. This layer could stably exist in the coating and its thickness increased with the pre-dipping time. At the same time, very thin Fe2Al5-Znx layer existed at the interface between steel substrate and coating. It was found that the thickness of both Fe2Al5-Znx and FeAl3-Znx+Z two phase layer changed a little with the immersing time in ZAM bath. In addition, it was confirmed that the corrosion resistance of the two-step hot-dipped ZAM coating was better than that of pure zinc coating. This kind of Zn-6Al-3Mg (ZAM) alloy coating with FeAl3-Znx+Z two-phase layer and high corrosion resistant will help to develop new kind of coa-ting on steel parts.
Key words:  hot-dip galvanizing    Zn-6Al-3Mg    two-step hot-dip    coating    microstructure
                    发布日期:  2021-07-16
ZTFLH:  TG174. 44  
基金资助: 江苏省博士后科研资助计划项目(2018K019B)
通讯作者:  yll_dd19760618@sina.com   
作者简介:  吴长军,常州大学材料科学与工程学院副教授,硕士研究生导师。2011年6月毕业于湘潭大学,获工学博士学位;2015—2016年在韩国浦项科技大学进行博士后研究工作,2017—2020年在江苏兴达钢帘线有限公司从事博士后研究。主要从事高性能金属材料、合金相图及材料设计、材料表面处理等方面的研究。近年来,先后发表SCI/EI收录论文40余篇。曾获教育部科技进步二等奖。姚利丽,高级工程师,江苏兴达钢帘线股份有限公司博士后科研工作站站长,江苏省结构与功能金属复合材料重点实验室学术带头人。2003年,毕业于北京科技大学,获工学硕士学位;2003—2005年,于上海交通大学从事材料加工专业的博士研究。现主要从事博士后科研工作站专项课题研究的管理工作,并着重于功能型金属复合材料基础研究和前沿技术等方面的探索工作。先后发表论文近30篇,获国家专利授权27项,主持参与多项江苏省科研项目,曾获得江苏省科学技术二等奖。
引用本文:    
吴长军, 姚利丽, 周志嵩, 薛烽, 朱晨露. 钢件双镀ZAM合金镀层的组织及耐蚀性[J]. 材料导报, 2021, 35(Z1): 434-437.
WU Changjun, YAO Lili, ZHOU Zhisong, XUE Feng, ZHU Chenlu. Microstructure and Corrosion Resistance of Two-step Hot-dipped ZAM Alloy Coating on Structural Steel. Materials Reports, 2021, 35(Z1): 434-437.
链接本文:  
http://www.mater-rep.com/CN/  或          http://www.mater-rep.com/CN/Y2021/V35/IZ1/434
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