CORROSION BEHAVIOR OF Ni–W/SiC NANOCOMPOSITE COATING IN NaCl SOLUTION

Ni–W/SiC nanocomposite coatings were prepared by electrodeposition in Ni–W plating bath containing SiC nanoparticulates. The effect of incorporation of SiC particulates into the Ni–W matrix on the morphology of the coating surface and corrosion properties was investigated. Scanning electron microscopy (SEM) showed that the SiC nanoparticulates are uniformly distributed in the Ni–W matrix. Corrosion tests were performed in 0.5 M NaCl solution using electrochemical measurements for Ni–W alloy coating and Ni–W/SiC nanocomposite coating. The results showed that the co-deposition of SiC nanoparticulates in the composite coatings increased the corrosion resistance. At last, the anti-corrosion mechanism of the nanocomposite coatings is also discussed.