【摘要】 利用电化学腐蚀技术对贫铀(DU)-2A12铝合金电偶腐蚀行为进行了研究。结果表明,在3.5%NaCl溶液中,DU和2A12铝合金的腐蚀过程是逐渐变化的,2A12铝合金的抗腐蚀性能较DU更好。在DU-2A12铝合金电偶对中,DU具有相对较低的电位而作为电偶腐蚀的阳极,在偶合的前24 h,二者的腐蚀电位差较大,电偶腐蚀驱动力大,电偶电流密度平均约6μA·cm-2,DU被加速腐蚀;24 h后,DU与2A12铝合金的腐蚀电位相近,电偶腐蚀驱动力减小,电偶电流密度平均约5.5μA·cm-2,与DU单独腐蚀时对应时间的腐蚀电流接近,电偶腐蚀作用不明显。DU和2A12铝合金组成的电偶对在3.5%NaCl溶液中的电偶腐蚀电位为–780~–805 mV,二者可长期偶合。更多还原

【Abstract】 Galvanic corrosion behaviors of depleted uranium(DU)-2A12 aluminium alloy couples were studied with electrochemical corrosion techniques. The results indicate that in 3.5%NaCl solution, corrosion process of DU-2A12 aluminium alloy change gradually with time. Corrosion resistance of 2A12 aluminium alloy is better than that of DU. In the couple of DU-2A12 aluminium alloy, DU has relatively lower corrosion potential and acts as an anode. In the former 24 h, corrosion potential difference is large, galvanic corrosion driving force is large, average galvanic corrosion current density is about 6 μA·cm-2, and corrosion of DU is accelerated. After 24 h corrosion, DU and 2A12 aluminium alloy have close potentials, the galvanic corrosion driving force decreases, average galvanic corrosion current density is about 5.5 μA·cm-2 and it is close to the corrosion current density of DU, while the effect of galvanic corrosion is not distinct. The galvanic potential of DU-2A12 aluminium alloy couple is –780~–805 mV, and they can couple with each other for a long period.更多还原