摘要
通过宏微观形貌观察及成分测试分析了合金化镀锌DP980GA带钢表面漏镀缺陷问题的形成原因。结果表明,漏镀缺陷坑内表面存在大量氧化锰和氧化铁颗粒,还存在少量的氧化铝和氧化铬等,这是由于连续退火炉内发生带钢表面锰的富集和选择性氧化,而在锌锅中铝热置换反应不完全,从而降低了带钢表面的浸润性,造成了漏镀缺陷。建议通过适度降低连续退火炉内加热段露点温度以减少表面选择性氧化生成的氧化锰膜及其厚度,并适度增加锌锅中Al含量,促进铝热置换反应进而使带钢表面的氧化锰充分地置换为氧化铝并沉入锌锅中,从而提高带钢表面的浸润性,解决表面漏镀问题。
Causes of surface bare defects of alloyed galvanized DP980GA strip were analyzed by means of macro and micro morphology observation and composition analysis.The results show that a large number of manganese oxide and iron oxide particles are found inside the plating pit,and a small amount of alumina and chromium oxide are also found,which is due to the enrichment and selective oxidation of manganese on the surface of the steel strip in the continuous annealing furnace,and the aluminothermic replacement reaction in the zinc pot is incomplete,thus reducing the wettability of the strip surface and causing the bare defects.It is suggested that through moderately reducing the dew point temperature of the heating section in the continuous annealing furnace to reduce the manganese oxide film formed by selective oxidation on the surface and its thickness,and moderately increasing the Al content in the zinc pot to promote the aluminothermic replacement reaction,the manganese oxide on the surface of the strip can be fully replaced by alumina and sunk into the zinc pot,thereby the wettability of the strip surface can be improved and the problem of surface bare defects can be solved.
作者
刘学良
曾松盛
龙旭凯
肖兵
曾为民
程瑜强
Liu Xueliang;Zeng Songsheng;Long Xukai;Xiao Bing;Zeng Weimin;Cheng Yuqiang(Valin Arcelor Mittal Automotive Steel Co.,Ltd.,Loudi Hunan 417009,China)
出处
《金属热处理》
北大核心
2025年第1期287-291,共5页
Heat Treatment of Metals
基金
娄底市小荷人才支持计划。
