采用扫描电镜(SEM)、背散射电子成像(BSE)的方法,研究了Fe2SiO4相析出行为对焊线钢丝表面镀铜的影响.结果表明:在工业加热炉气氛(残氧≤2.5％)条件下,形成的液态Fe2SiO4相酸洗难以去除,且在高线多道次轧制及用户多道次拉拔后具有遗传性,是镀铜层呈现暗灰色或黑色的原因.在试验钢Si含量为0.9 mass％的条件下,在温度≤1150℃时,Si元素对氧化有阻碍作用;在温度＞ 1150℃时,Fe2SiO4相熔化成为氧、铁离子的快速扩散通道,与FeO呈相互包裹状态成为酸洗难以去除的FeO-Fe2SiO4相.
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