Abstract
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 NiP layer. The electroplating employed Ce(NO3)3 containing pretreatment offered highest corrosion resistance with corrosion current density ~ 0.9 μA cm−2 and sustained 10 h salt spray exposure without failure. The coating produced with Ce(NO3)3 pretreatment showed highest critical load ~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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