Abstract
The corrosion resistance and corrosion morphology of electroless nickel coatings were investigated by potentiostatic anodic polarization measurement and scanning electron microscopy. The tests of electrochemical corrosion were performed in aqueous acidic, alkaline and neutral solutions. Results indicated that anodic behaviours of the coatings vary with the changes in structure and phosphorous contents of the coatings. In addition, the segregation of phosphorous during deposition with the appearance of a “cell structure” contributed to localized corrosion of the coatings. However, regardless of the structure and phosphorous content, the amorphous Ni-P coatings could be passivated in acidic and Cl --containing solutions only, not in alkaline solution.
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