Abstract

In this paper, Ni–Co–TiO2 composite electrodeposits were successfully prepared on AZ91D magnesium alloy for protecting the alloy from corrosion. Scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy were employed to investigate the surface morphologies, microstructure and chemical compositions of the composite coatings respectively. The electrochemical corrosion behaviours of the coatings in neutral 3·5 wt-%NaCl, 0·6 mol L−1 Na2SO4 and 0·6 mol L−1 NaOH solutions were evaluated by electrochemical impedance spectroscopy and potentiodynamic polarisation techniques, and the results indicate good protection for AZ91D magnesium alloy. Long term immersion tests were carried out in neutral 3·5 wt-%NaCl solution using electrochemical impedance spectroscopy, showing that Ni–Co–TiO2 composite coating could provide long term protection in neutral 3·5 wt-%NaCl solution for AZ91D magnesium alloy.

Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call