| TiB_2-ZrB_2/Ni涂层电极点焊镀锌钢板失效过程分析 |
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| 引用本文： | 肖瑶,李智,覃富城,王冲,董仕节,罗平.TiB_2-ZrB_2/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. |
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| 作者姓名： | 肖瑶 李智 覃富城 王冲 董仕节 罗平 |
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| 作者单位： | 绿色轻工材料湖北省重点实验室,武汉 430068;湖北工业大学 材料与化学工程学院,武汉 430068;绿色轻工材料湖北省重点实验室,武汉 430068;湖北工业大学 材料与化学工程学院,武汉 430068;绿色轻工材料湖北省重点实验室,武汉 430068;湖北工业大学 材料与化学工程学院,武汉 430068;绿色轻工材料湖北省重点实验室,武汉 430068;湖北工业大学 材料与化学工程学院,武汉 430068;绿色轻工材料湖北省重点实验室,武汉 430068;湖北工业大学 材料与化学工程学院,武汉 430068;绿色轻工材料湖北省重点实验室,武汉 430068;湖北工业大学 材料与化学工程学院,武汉 430068 |
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| 基金项目： | 国家自然科学基金（51375150）；博士科研启动基金（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） |
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| 摘 要： | 目的了解TiB_2-ZrB_2/Ni涂层电极点焊镀锌钢板时的失效机理。方法通过扫描电镜(SEM)、X射线衍射仪(XRD)、显微硬度测试等表征方法,研究TiB_2-ZrB_2/Ni涂层点焊电极点焊镀锌钢板时表面结构、物相及性能的变化。结果 TiB_2-ZrB_2/Ni涂层电极对提高点焊电极寿命有很大帮助,点焊电极寿命可提高5倍左右。涂层使点焊电极表面的硬度得以明显提高,减缓了点焊电极端部塑性变形的进程。ZrB_2-TiB_2/Ni涂层在一定程度上减缓了钢板镀层与点焊电极产生合金化反应的进程。结论 ZrB_2-TiB_2/Ni涂层电极由于具有一定的塑性,点焊过程中涂层不会出现完全脱落现象。涂层作用一直持续至电极失效,电极失效的形式主要表现为塑性变形。
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| 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 |
| 收稿时间： | 2017/7/10 0:00:00 |
| 修稿时间： | 2018/1/20 0:00:00 |
Failure Process Analysis of Electrodes with TiB2-ZrB2/Ni Coatings for Spot Welding Galvanized Steel Sheet |
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| XIAO Yao,LI Zhi,QIN Fu-cheng,WANG Chong,DONG Shi-jie and LUO Ping.Failure Process Analysis of Electrodes with TiB2-ZrB2/Ni Coatings for Spot Welding Galvanized Steel Sheet[J].Surface Technology,2018,47(1):142-148. |
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| Authors: | XIAO Yao LI Zhi QIN Fu-cheng WANG Chong DONG Shi-jie and LUO Ping |
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| Affiliation: | 1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan 430068, China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China,1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan 430068, China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China,1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan 430068, China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China,1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan 430068, China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China,1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan 430068, China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China and 1.Hubei Provincial Key Laboratory of Green Materials for Light Industry, Wuhan 430068, China; 2.School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China |
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| Abstract: | The work aims to reveal failure mechanism of electrodes with TiB2-ZrB2/Ni coatings for spot welding galvanized 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. Surface hardness of electrodes was obviously increased by the ZrB2-TiB2/Ni coatings, which slowed down plastic deformation on tips of coated elec¬trodes. 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 electrode failure is plastic deformation. |
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| Keywords: | TiB2-ZrB2/Ni coatings resistance spot welding electrode failure alloying plastic deformation failure analysis |
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