Corrosion of ultra-fine grained copper fabricated by equal-channel angular pressing
Corrosion of ultra-fine grained copper fabricated by equal-channel angular pressing
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DOI：
10.1016/j.corsci.2008.01.024
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发表时间：
2008-05
影响因子：
8.3
通讯作者：
H. Miyamoto;K. Harada;T. Mimaki;A. Vinogradov;S. Hashimoto
中科院分区：
文献类型：
--
作者：
H. Miyamoto;K. Harada;T. Mimaki;A. Vinogradov;S. Hashimoto
研究了等径角挤压（ECAP）制备的超细晶（UFG）铜与再结晶粗晶（CG）铜的腐蚀行为。腐蚀电流估计的塔菲尔外推法检查在一个修改的利文斯通蚀刻剂，这是敏感的位错和晶界的腐蚀动力学。UFG铜表现出较低的腐蚀电流相比，在其再结晶粗晶（CG）的对应物，尽管事实上，位错密度和晶界的总分数是更大的UFG铜比CG铜。UFG铜表面的腐蚀损伤在宏观上是相当均匀的，而CG铜在晶界处观察到明显的侵蚀和部分晶粒内部的选择性腐蚀。
Corrosion of ultra-fine grain (UFG) copper fabricated by equal-channel angular pressing (ECAP) has been investigated in comparison with that in recrystallized coarse grain (CG) copper. Corrosion current was estimated by a Tafel extrapolation method to examine the kinetics of corrosion in a modified Livingstone etchant, which is sensitive to dislocations and grain boundaries. UFG copper exhibited a lower corrosion current in comparison with that in its recrystallized coarse grain (CG) counterpart despite the fact that the dislocation density and total fraction of grain boundaries are much greater in UFG copper than in CG copper. Corrosion damage on the surface of UFG copper is macroscopically rather uniform whereas obvious attack at grain boundaries and selective corrosion of some grain interiors were observed in CG copper.