Influences of substrate temperature on microstructure and corrosion behavior of APS Ni ₅₀ Ti ₂₅ Al ₂₅ inter-metallic coating

Abstract

In the present investigation, Ni 50 Ti 25 Al 25 (at.%) mechanically alloyed powder is deposited on carbon steel substrate. Before the coating process, the substrate is heated to temperature ranging from room temperature to 400 • C. The microstructure, porosity, microhardness, adhesion strength, and corrosion behavior of the coating are investigated at different substrate temperatures. Results show that coating porosity is lower on high temperature surface. Microhardness and adhesion strength of the deposition layer on the substrate without preheating have lower values than with preheating. The polarization test result shows that corrosion performance of the coating is dependent on micro cracks and porosities and the increasing of substrate temperature can improve the quality of coating and corrosion performance.

Influence of N+implantation on structure, morphology, and corrosion behavior of Al in NaCl solution

“…Corrosion is defined as the interaction between a material (e.g., metal) and the corroding medium (environment) which leads to deterioration of the material and the environment. [14][15][16] Hence, the protection of the material from corrosion is of high importance. Use of different surface modification methods may provide ways to achieve this goal.…”