Electrodeposition, Structure and Corrosion Resistance of Nanocrystalline Ni―W Alloy

摘要

Ni―W alloy was electrodeposited from the electrolyte solution containing sodium tungstate, nickel sulfate and ammonium citrate. The electrodeposition, heat treatment, structure, surface morphology and corrosion resistance in w=0.03 NaCl solution, of Ni―W alloys were studied by means of DSC, XRD, SEM and electrochemical techniques. The results showed that the obtained Ni―W alloy electrodeposit with W weight content (w_W=0.471) was presented in more typical nanocrystalline. After heat treatment at 400℃ for 1 h, the phase structure of the deposits was not obviously changed whereas the agglomerate for the reunion of tiny grains on deposit surface caused the granule in a more smooth morphology, the microhardness was slightly increased and the corrosion resistance was enhanced.