Zn-Mg合金镀液中Al含量对批量热浸镀镀层结构的影响  

Effect of Al on Microstructure of Generally Batch Hot-Dip Galvanized Zn-Mg Alloy Coatings

作　　者：李远鹏 杨伟芳 江社明 熊俊波 卞景忠 郝茂德 LI Yuan-peng;YANG Wei-fang;JIANG She-ruing;XIONG Jun-bo;BIAN Jing-zhong;HAO Mao-de(Zhejiang Kingland Pipeline and Technologies Co.,Ltd.,Huzhou 313000,China;National Engineering Lab of Advanced Coating Technology for Metallic Materials,China Iron and Steel Research Institute Group,Beijing 100081,China)

机构地区：[1]浙江金洲管道科技股份有限公司,浙江湖州313000 [2]中国钢研科技集团有限公司先进金属材料涂镀国家工程实验室,北京100081

出　　处：《材料保护》2018年第8期6-9,共4页Materials Protection

基　　金：南太湖精英计划领军型创新团队项目

摘　　要：在Zn-Mg批量热浸镀时,添加Al能抑制Mg在镀液表面的氧化,但其会对镀层结构和组织产生影响。在Q235钢表面采用不同Al含量的Zn-Mg合金镀液制备了镀层。利用SEM,EDS,GDOES等技术分析了Al含量对Zn-Mg合金镀层组织、结构的影响。结果表明:随着Zn-Mg合金镀液中Al含量的增加,镀层中的Fe-Zn合金相层逐渐减薄,Al含量为0.150%时,Fe-Zn合金相层消失,镀层主要由自由锌层组成; Al主要存在于镀层/基体界面,且以Fe-Al金属间化合物形式存在; Fe-Zn合金相层的减薄主要原因是Fe-Al金属间化合物层的抑制作用。When Zn-Mg alloy coatings were batch hot-dip galvanized on Q235 steel sheets, adding Al could inhibit the oxidation of Mg in bath, but also affect the structure and composition of coating. The coatings containing various Al contents were obtained on Q235 steel sheets, respectively. The effects of Al contents on coating microstructure and composition were analyzed by using SEM, EDS and GDOES. Results showed that with the increase of Al contents, the thickness of Fe-Zn phase layer decreased. When Al content reached up to 0. 150%, the Fe-Zn phase layer disappeared. In addition, the coating was mainly composed of free zinc layer. Aluminum was mainly distributed on the interface of coating and substrate, and which existed as a Fe-AI intermediate layer. Besides, the main reason that caused the thickness decrease of Fe-Zn alloy phase layer was that the Fe-Al intermediate alloy layer inhibited the growth of the Fe-Zn alloy phase in the coating.

关 键 词：批量热浸镀 Zn—Mg合金镀层 铝含量 镀层结构 

分 类 号：TG174.443[金属学及工艺—金属表面处理]