ADS结构材料在液态Pb-Bi合金中的腐蚀

Corrosion Behavior of Materials in Liquid Pb-Bi Eutectic

概要综述了加速器驱动洁净核能系统(ADS)结构材料在液态Pb Bi合金中的腐蚀机理、影响因素及其防护技术。腐蚀机理主要是:1)材料组分元素在Pb Bi合金中的溶解和质量迁移;2)组分元素与Pb Bi合金中的杂质氧的化学反应;3)Pb Bi合金沿材料晶界渗透导致的晶界脆化。主要影响因素为:1)系统的温度和温差;2)Pb Bi合金中的氧含量;3)材料的化学成分;4)Pb Bi合金的流速。氧含量的控制与测量是防止材料腐蚀的重要技术环节,此外,材料表面处理及改性等防护技术有良好应用前景。

The mechanism, influence factors and protection techniques of the materials corrosion in liquid Pb-Bi eutectic were summarized. The main corrosion mechanism is: 1) the dissolution and mass transfer of the composition elements of the materials in liquid Pb-Bi eutectic; 2) the chemical reaction between the composition elements and oxygen in Pb-Bi eutectic; 3) the intergranular boundary brittle resulting from the Pb-Bi penetration along the intergranular boundary of the materials. The influence factors are as following: 1) the temperature and the temperature differential in the system; 2) the oxygen content or oxygen part pressure in the system; 3) the chemical composition of the materials; 4) the velocity of the Pb-Bi eutectic. The controlling and measurement of the oxygen content in Pb-Bi eutectic is a key technique for the prevention of the materials corrosion. Moreover, the treatment and modification of the materials surface will also have a good prospect for the prevention of the materials corrosion in Pb-Bi eutectic.