【摘要】 7A09铝合金管材经切削加工和阳极氧化后少数工件表面有“黑条”,影响用户使用。对“黑条”处进行宏观组织和显微组织观察及分析研究认为:“黑条”是由于管材的毛坯管锭表面的偏析瘤未车削净,而挤入管材内形成化合物富集区,化合物富集区在阳极氧化时优先反应而形成的。更多还原

【Abstract】 The causes about black-strip mark at surface of 7A09 aluminium alloy tube after oxidizing are researched through metallurgical structure analysis.The results show the segregation tumors at tube black surface extruding into tube form compound rich areas,the compound rich areas preferred reaction during oxidizing form the black-strip marks.更多还原