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| Corrosion Behavior of Ultra-fine Grain Copper by Equal Channel Angular Pressing in 0.5mol/L NaCl Solution |
| WANG Qing-juan, ZHANG Ping-ping, LUO Lei, DU Zhong-ze |
| School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China |
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Abstract The corrosion behavior of ultra-fine grain (UFG) copper bulk prepared by equal channel angular pressing (ECAP) was investigated in comparison with that in recrystallized coarse grain (CG) copper in 0.5mol/L NaCl solution by Tafel extrapolation method, E-t curve and immersion corrosion tests. Corrosion current was estimated by Tafel extrapolation method to examine the kinetics of corrosion in 0.5mol/L NaCl solution. The result shows that UFG copper exhibits a lower corrosion current and high self-corrosion potential in comparison with CG copper. UFG copper has higher corrosion resistance compared with CG copper. Corrosion damage on the surface of UFG copper is macroscopically rather smooth and uniform whereas localized corrosion of CG copper is very severe for obvious attacking at grain boundaries and selective corrosion of some grain by using electrochemical analysis and microscopic corrosion morphology.
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Received: 10 January 2012
Published: 20 May 2013
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2013, Vol. 0 
