立柱热镀锌层剥落原因分析和改进  

Cause analysis on peeling of hot-dip zinc coating from guardrail post and countermeasures

作　　者：管忠春 赵庆虚 马丽波 王胜民[2] GUAN Zhongchun;ZHAO Qingxu;MA Libo;WANG Shengmin(Yunnan Tonghai Fangyuan Industry&Trading Co.,Ltd.,Yuxi 652700,China;Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]云南通海方圆工贸有限公司,云南玉溪652700 [2]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《电镀与涂饰》2022年第5期332-334,共3页Electroplating & Finishing

摘　　要：某热浸镀锌立柱在冲孔后镀层出现起皱和脱落现象。采用扫描电镜和能谱仪分析立柱不同部位热浸镀锌层的组织结构,发现锌层中脆性ζ相过厚是主要原因,通过适当缩短浸镀时间和在浸镀液中添加0.1%(质量分数)的Al可解决上述问题。The wrinkling and peeling phenomena appeared on hot-dip zinc coating of guardrail posts after being punched.The phase structure of hot-dip zinc coating at different positions of guardrail post was analyzed by scanning electron microscopy and energy-dispersive spectroscopy.It was found that the excessive thickness of brittle ζ-phase layer in zinc coating was the primary cause to the said defects.The problem could be solved by appropriately shortening the dipping time and adding 0.1%(mass fraction)of aluminum to the zinc bath.

关 键 词：立柱 热浸镀锌层 结合强度 剥落 抗冲击性 

分 类 号：TG174.443[金属学及工艺—金属表面处理]