The influence of process parameters during friction stir processing on corrosion properties of titanium alloys: An overview

Titanium alloy’s light-to-weight ratio and excellent resistance to corrosion and wear have led to its increasing appeal in the biomedical and aerospace industries. On the other hand, corrosion resistance is lowered in highly acidic environments. For long-term application of titanium in biomedical applications where toxicity and implant failure rates need to be minimized, they must have increased corrosion resistance. Friction stir processing (FSP) is a solid-state process that involves severe plastic deformation resulting in enhanced surface properties such as hardness, wear resistance, and reduced defects. Previous studies have mostly concentrated on the influence of FSP on increased hardness and wear, and there isn’t much clear knowledge of how FSP affects corrosion characteristics. The review’s objective is to understand the effects of the FSP process parameters on the corrosion behavior of titanium alloys. A comprehensive literature review will provide an in-depth analysis of prior studies on the connection between corrosion resistance and FSP. Potentiodynamic polarization and electrochemical spectroscopy results were utilized to evaluate the titanium alloys’ corrosion behavior. Following FSP, an equiaxed grain size forms, and increasing the number of passes reduces the grain size and raises high-angle grain boundaries, improving corrosion resistance.