表面技术2018，Vol.47Issue(1)：142-148,7.DOI:10.16490/j.cnki.issn.1001-3660.2018.01.022
TiB2-ZrB2/Ni涂层电极点焊镀锌钢板失效过程分析
Failure Process Analysis of Electrodes with TiB2-ZrB2/Ni Coatings for Spot Welding Galvanized Steel Sheet
摘要
Abstract
The work aims to reveal failure mechanism of electrodes with TiB2-ZrB2/Ni coatings for spot welding galva-nized steel sheet. Changes in surface structure, phase and properties of the coatings for spot welding galvanized steel sheet were characterized with scanning electron microscopy, X-ray diffractometer and microhardness test, respectively. Applying TiB2-ZrB2/Ni coatings to electrodes could significantly improve service life of spot-welding electrodes by nearly 5 times. Sur-face hardness of electrodes was obviously increased by the ZrB2-TiB2/Ni coatings, which slowed down plastic deformation on tips of coated electrodes. In addition, the ZrB2-TiB2/Ni coatings could mitigate alloying reaction between steel sheet coatings and spot-welding electrodes to some extent. The coatings will not drop off completely during the process of spot welding as ZrB2-TiB2/Ni-coated electrodes are of certain plasticity. The coatings acts until the electrodes fail, and primary form of elec-trode failure is plastic deformation.关键词
TiB2-ZrB2/Ni涂层/电阻点焊/电极失效/合金化/塑性变形/失效分析Key words
TiB2-ZrB2/Ni coatings/resistance spot welding/electrode failure/alloying/plastic deformation/failure analysis分类
矿业与冶金引用本文复制引用
肖瑶,李智,覃富城,王冲,董仕节,罗平..TiB2-ZrB2/Ni涂层电极点焊镀锌钢板失效过程分析[J].表面技术,2018,47(1):142-148,7.基金项目
国家自然科学基金(51375150) （51375150）
博士科研启动基金(BSQD2015015) （BSQD2015015）
绿色轻质材料与加工湖北工业大学协同创新中心开放基金(201611A07)Supported by the Natural Science Foundation of China (51375150) （201611A07）
Doctor Startup funds (BSQD2015015) （BSQD2015015）
Collaborative Innovation Center Open Fund of Hubei Provincial Key Laboratory of Green Materials for Light Industry, Hubei University of Technology (201611A07) （201611A07）
