Journal
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
Volume 69, Issue 10, Pages 1455-1461Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/maco.201810165
Keywords
corrosion behavior; equal channel angular pressing; grain boundary character distribution; ultrafine-grained copper
Funding
- National Natural Science Foundation of China [51401105]
- China Postdoctoral Science Foundation [2017M623392]
- Natural Science Foundation of the Jiangsu Higher Education Institution of China [13KJB430015]
- Program for international S&T Cooperation Project of China [2015DFA51430]
- Priority Academic Program Development of Jiangsu higher education institutions (PAPD)
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The corrosion behavior of copper fabricated by equal channel angular pressing and further annealing was systematically investigated in 3.5wt% NaCl solution using potentiodynamic polarization, electrochemical impedance spectroscopy, and weight loss method. Microstructure and corroded surface morphologies were observed by electron backscattered diffraction and scanning electron microscopy, respectively. Results indicated that ultrafine-grained copper had much lower corrosion current density and corrosion rate than annealed coarse-grained counterparts. Transition from uniform to intergranular mode of corrosion happened, which can be attributed to the dominance of two times larger volume fraction of high angle grain boundaries formed during annealing process.
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