Investigations on Corrosion Behaviour of Surface Texturing on Ni45Ti55 Alloy Manufactured Using µ-Plasma Additive Manufacturing Process

Abstract

This study reports the influence of surface texturing patterns (circular dimples, hexagonal dimples, and hexagonal spots) on corrosion behaviour, manufactured by µ-plasma additive manufacturing (MPAM) process on Ni45–Ti55 alloy for offshore, food processing, and biomedical applications. Corrosion studies were done by electrochemical potentiodynamic polarization in Hank’s solution (pH value 7.4) and seawater (pH value 8.1). Tafel extrapolation, electrochemical impedance spectroscopy (EIS), and open circuit potential showed a significant difference in corrosion behaviour among the surface textured hexagonal dimples, hexagonal spots, and circular dimple samples. The EIS and Tafel extrapolation in Hank’s solution showed that circular dimples surface textured sample depicted better corrosion resistance potential (Rp) as 55 Ω, corrosion potential (Ecorr) as − 0.56 V, and corrosion current density (icorr) as 0.15 A/cm2, followed by hexagonal dimples and hexagonal spots. The present study indicated advantage of surface texturing on corrosion resistance improvement of Ni45–Ti55 alloy. © The Indian Institute of Metals - IIM 2024.