Abstract
Current work intends to improve the corrosion performance of plasma sprayed titanium coating by reinforcing a carbon-based zero-dimensional nanomaterial: Nanodiamond (ND). Various composition (0.1, 0.5 and 1 wt%) of ND was reinforced in the Ti feedstock. XRD of the powders and coatings showed the presence of majorly Ti phase, only difference being the presence of oxide phase in the coatings. The electrochemical tests in 3.5 wt% NaCl solution showed a dual faceted effect of ND reinforcement on the corrosion behavior. The 0.1 wt% ND reinforcement in Ti matrix drastically decreased the corrosion rate to 3.162 mpy of the coating as compared to that of monolithic Ti coating having corrosion rate of 5.89 mpy due to filling up of pores and micro-cracks in the coating. On contrary, the corrosion rate of Ti-1 wt% ND coating dramatically increased to 5.148 mpy, attesting that higher ND (≥1 wt%) content might not be a right choice when corrosion resistance of matrix is concerned. Higher ND content initiates microgalvanic corrosion in the composites. Post corrosion studies were also carried out to show the effect of electrolyte as well as of ND content on the microstructure of the coating after corrosion. From this study, it can be deduced that ND addition might be an economical option if improving the corrosion resistance of the various engineering components are concerned, since a 0.1 wt% ND content is able to drastically improve the resistance of the coating.
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