Influence of Rotation Speed on the Corrosion Behavior of Friction Stir Welded Joints in Az31 Magnesium Alloy

The purpose of this paper is to study the effect of friction stir welding (FSW) process conditions on the corrosion properties of AZ31 magnesium alloy welded joints. The effects of different rotation speeds on the microstructure and corrosion behavior of welded joints were studied by potentiodynamic polarization (Tafel plot), electrochemical impedance spectroscopy (EIS), and scanning vibrating electrode technique (SVET). The results indicate that rotational speed acts as a crucial parameter in governing the microstructure and corrosion resistance of AZ31 alloy welded joints. The welded joints processed at a rotational speed of 1800 r/min demonstrate the most optimal corrosion resistance. This phenomenon results from the small grain structure and finer Al-Mn compounds formed during welding, influenced by heat and mechanical action under specific conditions.

Keywords: Keywords: Magnesium alloy, FSW, Corrosion resistance, SVET

Suggested Citation: Suggested Citation

Chen, Shujin and Zhou, Ziru and Hodgson, Michael and Gao, Wei and Wang, Yuxin, Influence of Rotation Speed on the Corrosion Behavior of Friction Stir Welded Joints in Az31 Magnesium Alloy. Available at SSRN: https://ssrn.com/abstract=4972804 or http://dx.doi.org/10.2139/ssrn.4972804