CAJ | 학술논문

采用平面分流模具热挤压成型制备了内部镶嵌钢芯的 AZ31镁合金牺牲阳极,研究了挤压温度对其成形性能、显微组织、电化学性能以及在模拟土壤环境(饱和 CaSO 4-Mg(OH)2溶液)中腐蚀形貌的影响.结果表明：当挤压比为12,挤压温度为320~410℃时,AZ31镁合金阳极表面成形良好；晶粒尺寸随着挤压温度的升高先减小后增大,最小晶粒尺寸达到12．2μm；随着挤压温度的升高,镁合金电流效率和开路电位均先增大后减小,而表面腐蚀程度先减轻后加深,当温度为380℃时,电流效率和开路电位达到最大,分别为63．93％,－1．586 V,此时表面点蚀孔数量最少,腐蚀程度最轻.
채용평면분류모구열제압성형제비료내부양감강심적 AZ31미합금희생양겁,연구료제압온도대기성형성능、현미조직、전화학성능이급재모의토양배경(포화 CaSO 4-Mg(OH)2용액)중부식형모적영향.결과표명：당제압비위12,제압온도위320~410℃시,AZ31미합금양겁표면성형량호；정립척촌수착제압온도적승고선감소후증대,최소정립척촌체도12．2μm；수착제압온도적승고,미합금전류효솔화개로전위균선증대후감소,이표면부식정도선감경후가심,당온도위380℃시,전류효솔화개로전위체도최대,분별위63．93％,－1．586 V,차시표면점식공수량최소,부식정도최경.
AZ31 magnesium sacrificial anode containing a steel core was fabricated by hot extrusion using plane porthole dies,and the effects of extrusion temperature on the surface quality,microstructure,electrochemical property and corroded surface morphology of the magnesium anode in saturated calcium sulfate-magnesium hydroxide solution were investigated.The results show that the magnesium anodes with high appearance quality was obtained when the extrusion ratio reached 12 and temperature varied between 320 to 380 ℃;the grain size of the magnesium alloy first decreased then increased with the increase of extrusion temperature,and the minimum grain size reached 12.2 μm;with the extrusion temperature increase,the current efficiency and open circuit potential of the magnesium alloy first increased then decreased,while the corrosion degree first reduced then accelerated.At 380 ℃,the current efficiency and open circuit potential reached the largest value of 63.93% and - 1.586 V, meanwhile the surface pits quantity was the least as the corrosion degree was the lightest.