Effect of friction stir processing on corrosion behavior of AZ31 magnesium alloy
In order to investigate the effect of friction stir processing on the corrosion performance of AZ31 magnesium alloy,the corrosion behavior of AZ31 base material and FSP-AZ31 under different process parameters in 3.5 wt.%sodium chloride solution was studied using stereoscopy,optical micros-copy,contact angle measurement,electrochemical workstation and other equipments.The results show that the corrosion mechanism of FSP-AZ31 and the base metal is pitting corrosion in the range of rotat-ing speed 800-1200 r/min and processing speed 80-120 mm/min.Compared with the base metal,FSP-AZ31 has a lighter degree of pitting corrosion,the self-corrosion current density is reduced,the impedance is increased,and FSP can improve the corrosion resistance of AZ31 magnesium alloy.When the processing speed is 100 mm/min,as the rotation speed increases,the self-corrosion current density of FSP-AZ31 is continuously decreased,and the performance of corrosion resistance is continuously improved.When the rotation speed is 1200 r/min,the self-corrosion current density of the sample reaches the minimum value of 9.2×10-5 A·cm-2.When the rotation speed is 1000 r/min,as the pro-cessing speed decreases,the self-corrosion current density of FSP-AZ31 is continuously decreased,and the performance of corrosion resistance is continuously improved.When the processing speed is 80 mm/min,the corrosion current density of the sample reaches the minimum,with a value of 7.6×10-5 A·cm-2.Compared to AZ31 magnesium alloy,the contact angle of FSP-AZ31 is increased from 29.703 ° to 58.448 ° under 1000 r/min and 80 mm/min.
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