超细晶铜具有较高的使用价值,过去对其腐蚀性能研究不多.将工业纯铜退火后,通过等通道转角挤压(ECAP)法挤压成超细晶材料,采用浸泡和电化学方法,结合扫描电镜表面分析技术研究了退火态纯铜和ECAP制备的块体超细晶铜在HCl水溶液中的腐蚀性能.结果表明:用ECAP法制备的超细晶铜结构致密,具有比退火态铜更高的自腐蚀电位和更低的腐蚀电流密度,耐腐蚀性能更强;在不同浓度HCl溶液体系中,超细晶纯铜的失重速率比退火态纯铜小;随着溶液浓度的降低和浸泡时间的延长,超细晶铜和退火态铜的失重速率均减小并趋于稳定;浸泡腐蚀2周后,与退火态铜易发生局部晶间腐蚀相比.超细晶纯铜的均匀腐蚀占主要优势.
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