Corrosion behavior of bone pin SS 316 and zinc alloys fabricated by continuous friction welded joint

This study's innovation is in the utilization of continuous friction welding to join SS 316 and zinc alloy materials as bone pins, an issue area that has not been extensively explored in biomedical applications. In addition, the approach to evaluate corrosion behavior through a combination of potentiodynamic polarization testing and immersion testing in 0.09 % NaCl solution provides a comprehensive simulation of the physiological conditions of the human body. The findings indicated the occurrence of pitting, galvanic, and localized corrosion within the weld zone. This study also reveals new findings related to the effect of redistribution of oxygen (O), chromium (Cr), and nickel (Ni) elements at the joint interface due to thermal deformation during the welding process, which significantly affects the corrosion resistance of the joint. These findings underscore the pivotal influence of temperature factors and material composition on the corrosion behavior of the joint.