不同镀层板的电阻点焊腐蚀行为
Corrosion behaviors of different metal-coated steel sheets after resistance spot welding
王浩宇 1佟连杰 1孟凡月 1许晓 1戚振南 2张静 1夏明生1
作者信息
- 1. 唐山钢铁集团有限责任公司,河北 唐山 063000
- 2. 河钢材料技术研究院,河北 石家庄 050023
- 折叠
摘要
[目的]研究点焊对不同镀层板腐蚀行为的影响.[方法]对镀锌板和镀锌铝镁板进行电阻点焊,采用扫描电镜和能谱仪分析了点焊部位的微观形貌和元素分布.通过中性盐雾试验和电化学阻抗谱测试研究了两种板材点焊前后在相同环境下的腐蚀行为.[结果]点焊镀锌板的焊点边缘存在大量凸起和凹坑,而点焊镀锌铝镁板的焊点边缘无明显的凸起和凹坑.二者的焊点位置Zn元素挥发明显,均有部分基体裸露.无论点焊与否,镀锌板在中性盐雾试验中的耐腐蚀能力都不如镀锌铝镁板.[结论]电阻点焊容易导致镀层局部破损,影响镀层的耐蚀性.
Abstract
[Introduction]The effect of spot welding on corrosion behavior of steel sheets with different coatings is worthy of study.[Method]Resistance spot welding was conducted on the surfaces of Zn-coated steel and Zn-Al-Mg alloy-coated steel sheets.The morphology and element distribution at and around the welded spots were analyzed by scanning electron microscopy and energy-dispersive spectroscopy.The corrosion behaviors of Zn-coated steel and Zn-Al-Mg alloy-coated steel before and after resistance spot welding in the same environment were studied by neutral salt spray test and electrochemical impedance spectroscopy.[Result]There were many bumps and pits at the edge of welded spots for Zn-coated steel,but not for Zn-Al-Mg alloy-coated steel.The substrates at the welded spots of the both steel sheets were partially exposed due to the volatilization of zinc element during welding.Regardless of spot welding or not,the corrosion resistance of Zn-coated steel in neutral salt spray test was not as good as that of Zn-Al-Mg alloy-coated steel.[Conclusion]Resistance spot welding can easily lead to partial damage of the coatings on steel sheets and affect their corrosion resistance.
关键词
镀锌板/镀锌铝镁板/电阻点焊/耐蚀性Key words
zinc-coated steel/zinc-aluminum-magnesium alloy-coated steel/resistance spot welding/corrosion resistance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据