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Effects of Ti Content and Annealing on Corrosion Resistance of Electroless Ni–P–Ti Composite Coatings

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Abstract

Electroless Ni–P coatings have good corrosion resistance but low toughness. To improve the toughness of Ni–P coatings, superelastic NiTi particles were incorporated within the Ni–P coatings. However, because of the high cost of the superelastic NiTi in comparison with Ti powder, Ti particles were co-deposited with Ni–P and subsequently annealed to produce Ni–P-NiTi coating. The formation of superelastic NiTi has been proven to improve the toughness of Ni–P coating in our previous study. In the present study, the effects of Ti content and annealing on corrosion behavior of Ni–P–Ti coatings were investigated using Potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS) tests in a 3.5 wt% sodium chloride solution at room temperature. PP and EIS results revealed that as-deposited Ni–P coating has a corrosion rate of 9.01 × 10–2 mm/year and a charge transfer resistance of 32,865 Ωcm2, while annealed 11.8 wt% Ti coating displays lower corrosion rate of 3.31 × 10–2 mm/year and higher charge transfer resistance of 42,653 Ωcm2. The corrosion resistance of as-deposited and annealed Ni–P–Ti coatings increases with an increase in Ti content up to 11.8 wt%, then drops slightly when the Ti content reaches 15.2 wt%. It was found that the as-deposited and annealed Ni–P coatings undergo pitting corrosion, whereas as-deposited and annealed Ni–P–Ti coatings exhibit uniform corrosion having higher corrosion resistance. Porosity density of the coatings was calculated to facilitate the understanding of corrosion behavior. This study also discusses the effects of microstructure and surface morphology on the corrosion mechanisms of as-deposited and annealed Ni–P–Ti coatings.

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Acknowledgements

Authors are grateful to Natural Scientific and Engineering Research Council of Canada for financial contribution (Grant No. RGPIN 327449) toward this research study.

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  1. Department of Mechanical Engineering, Dalhousie University, Halifax, NS, B3J 2X4, Canada

    Zhi Li & Zoheir Farhat

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  1. Zhi Li
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Li, Z., Farhat, Z. Effects of Ti Content and Annealing on Corrosion Resistance of Electroless Ni–P–Ti Composite Coatings. J Bio Tribo Corros 7, 97 (2021). https://doi.org/10.1007/s40735-021-00535-2

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  • DOI: https://doi.org/10.1007/s40735-021-00535-2

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