液体推进剂贮箱材料的电化学腐蚀行为的试验研究

Experimental Technique on Electrochemical Corrosion Behavior of Liquid Propellant Tank Material

通过电偶腐蚀、加速腐蚀和缝隙腐蚀试验，研究了液体推进剂贮箱材料的电化学腐蚀行为，并用光学显微镜观察了试验后的材料表面腐蚀形貌。结果表明，铝合金LF6、LD10、2219和LF3与不锈钢1Crl8Ni9Ti和316L的电偶电流均小于0．3A／cm^2，属于A级相容；无论贮箱箱体主材料为LD10或2219，在与箱体附件材料LF3组成的电偶对中，LD10和2219均为阴极金属受到保护；2219和LD10在20％室温、68％硝酸环境下的阳极极化曲线相似，年腐蚀速率相当。

Electrochemical corrosion behavior of propellant tank were investigated by galvanic corrosion, accel- erated corrosion and crevice corrosion test. The surface morphology and chemical composition of the corrosion product of the alloy were examined by optical microscope. The results showed the excellent compatibility of 2219, LD10, LF6, LF3 aluminum alloy and 1Cr18Ni9Ti, 316L, whose galvanic current were all less than 0.3 A/cm^2; Forming couple with LF3, LD10 and 2219 were both protected as cathode metal; Based on the anodic polarization curves, annual corrosion rate of 2219 and LD10 were approximate.