Abstract
The influences of cold rolling deformation on the microstructures and corrosion behavior of laser metal deposition processed GH3536 alloy were investigated through electron backscattered diffraction and electrochemical tests. The results indicate that the deformed sample within a 15 % of reduction exhibits an excellent corrosion resistance in the simulated PEMFC solution, which can be mainly attributed to a small amount of deformation providing more nucleation sites for Cr to form compact Cr2O3 passive films. In addition, an appropriate compressive residual stress reduces point defect concentrations in passive films and limits interfacial reaction kinetics. In comparison, the corrosion resistance of GH3536 alloy obviously decreases with an increase in deformation reduction from 15 % to 50 %. Apart from a strong increase in activation energy, high-density dislocations after a severe deformation will enhance the surface activity and result in the lattice distortion in the passive film, which deteriorates the corrosion resistance of cold-rolled GH3536 alloy samples.
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