Surface Features and Electrochemical Properties of Corrosion Resistant Ni-Ti Coatings

摘要

Nowadays, application of Ni-Ti alloys is receiving a great interest because of their premium hardness, wear, and corrosion resistance properties. Anti-corrosive Ni-Ti alloy coatings were fabricated by electrodeposition technique. The bath constituents and electrodeposition conditions have been optimized by the Hull cell technique. The surface features of the Ni-Ti alloy coating were analyzed with Scanning electron microscopy (SEM) along with Energy dispersive x-ray spectroscopy (EDX) depicting the presence of Ti, C, Ni, and O elements in the deposit. The phase structure of the alloy coating at different current densities was studied with X-ray diffraction spectroscopy (XRD). The micro-hardness of the coating film was measured by Vicker's micro-hardness tester and the maximum value was found to be 136 HV0.5 at optimal current density (4 A/dm(2)). The potentiostatic polarization and electrochemical impedance spectroscopy measurements were used to determine the corrosion properties of the Ni-Ti coating films. New low-cost sulphate bath has been proposed for uniform Ni-Ti alloy coating and the results indicate greater corrosion resistance properties, and these coatings can be used for biomedical, electronics and aerospace industries.