Journal
SURFACE & COATINGS TECHNOLOGY
Volume 428, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2021.127881
Keywords
AZ91 alloy; ChCl based ionic liquids (ILs); Ni electroplating; Corrosion; Scratch resistance
Funding
- Council of Scientific & Industrial Research-NML [OLP-0251]
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The study found that Ni electroplating on AZ91 alloy in a novel ionic liquid demonstrated good corrosion resistance and adhesion strength, with electroplating employing Ce(NO3)(3) pretreatment showing the best performance.
The present investigations construe study of Ni electroplating on AZ91 alloy in novel ChCl- ethylene glycol eutectic based ionic liquid using non-fluoride and non-chromium surface pretreatments and sandwiched electroless Ni-P layer. The electroplating employed Ce(NO3)(3) containing pretreatment offered highest corrosion resistance with corrosion current density similar to 0.9 mu A cm(-2) and sustained 10 h salt spray exposure without failure. The coating produced with Ce(NO3)(3) pretreatment showed highest critical load similar to 15.53 N and exhibited better adhesion strength than that produced using NiCO3. The coating performance is correlated with porosity index and NiP2 phase evolved after heat treatment.
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