铝和铝合金的化学抛光原理

作者: admin 日期: 2016-04-19 11:45:47 人气: - 评论: 7253

来源: 中铝网

        铝和铝合金的化学抛光是以70(质量百分数)的磷酸为基础的溶液。常用的是磷酸、硝酸、硫酸混合液,当合金成分变化时,硫酸含量(质量百分数)9%。l5%之间变化,硝酸含量(质量百分比)3%~9%之间变化。由于工作温度在105℃左右,大量产生氮氧化物污染环境。因此,在磷酸和硫酸混合液基础上用S类酸铜光亮剂作添加剂,产生了无黄烟化学抛光工艺。但这种无黄烟化学抛光只适用于纯铝或铝镁合金,对其他铝合金效果较差。后来又有只加2%硝酸的配方出现,也用类似的添加剂,没得到扩大适用范围。但是,至今磷酸、硝酸、硫酸混合液因为适应性强,还是主流配方。

 

        含铜、锌较高的铝合金,化学抛光时加25g/L铬酐有帮助。手册上有记述,含硅高的铝合金,化学抛光时用6065mLL硝酸、1520mLL氢氟酸、甘油12mLL的混合液,在室温下浸2s。不过这种方法更像是浸蚀。

 

        还有一种含醋酸的配方,适用于纯铝和2A12(LYl2)

 

磷酸

850mLL

冰乙酸

l00mLL

硝酸

50mLL

温度

80100℃

时间

25min

醋酸对于防止点状腐蚀有更好的效果。

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