Abstract
The effect of SiC content in plating bath on the surface morphology and corrosion resis- tance of electroless plated Ni-P-SiC composite coatings on AZ91D magnesium alloy was investigat- ed by means of SEM, XRD and electrochemical corrosion measurements. The results indicate that the deposition rate and SiC content in the Ni-P-SiC composite coatings increase firstly and then de- crease afterwards with the increase of SiC content in the plating bath. The P content and grain size of the composite coatings decrease with the increase of SiC content in the plating bath. The effect of the codeposited SiC on the corrosion process of Ni-P-SiC composite coatings in 3.5%NaCl solu- tion is found negligible, however the corrosion resistance of the Ni-P-SiC composite coatings de- creases with the increase of SiC content in the coatings.
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