Abstract
The surface modification of nickel-aluminum bronze (NAB) alloy was developed by thermal diffusion of Ni coating and the alloy matrix. A multilayer coating was designed with the gradient outer layer of the Ni-Cu solid solution and the inner layer of the Ni-Al-Cu intermetallic layer. The evolution of the multilayer was a diffusion controlled model. The enhanced corrosion resistance of the Ni-Cu layer could be found in the salt spray test, which exhibited uniform corrosion behavior compared with severe selective phase corrosion of the NAB alloy. Besides the gradient distribution of the components, it was also attributed to the formation of protective film, which mainly consisted of Ni(OH)2 and Cu2O. It has been confirmed by electrochemical impedance spectroscopy (EIS) test and X-ray photoelectron spectroscopy (XPS) results.
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