某新型航空发动机压气机叶片服役环境适应性研究初探

目的 开展某新型航空发动机压气机叶片服役环境适应性研究,探究压气机叶片服役环境下的耐蚀性及腐蚀萌生周期.方法 采用电化学工作站,开展压气机材料典型环境下标准三电极电化学试验,获取腐蚀电流.结合机场环境谱与当量折算法,利用计算得到的当量折算系数,对机场环境谱进行当量折算,编制模拟该型发动机后续服役环境的仿真加速腐蚀试验环境谱.依据该环境谱,开展压气机叶片试件仿真加速腐蚀试验.结果 在模拟服役环境下的第8个当量腐蚀年限时,新型航空发动机压气机叶片开始出现局部点蚀.随着腐蚀年限的延长,腐蚀损伤程度逐渐加重.结论 在服役环境下,新型航空发动机压气机叶片具有良好的环境适应性,能够满足6～8 a首翻期内的环境适应性要求.

Study on Environmental Adaptability of the Blade of a New Aero-engine Gas Compressor

A simulation accelerated corrosion experiment of a new type aero-engine compressor blade simulating service environment was carried out, and the corrosion resistance and corrosion damage evolution law of the compressor blade under service environment were examined. Electrochemical experiment were carried out with electrochemical workstation in typical environment of compressor material and corrosion current in typical environment was acquire. Combined with the existing airport environment spectrum and equivalent conversion algorithm, the airport environment spectrum was equivalently conversed using conversion coefficient obtained from corrosion current, the accelerated corrosion test spectrum for simulated follow-up service environment was compiled, and the accelerated corrosion test of compressor blade was carried out based on the obtained accelerated corrosion test spectrum. Local pitting corrosion of new type aeroengine compressor blade appeared at the 8 equivalent corrosion year, and with the prolongation of corrosion time, the corrosion damage degree is gradually aggravated. The new aeroengin compressor blades have good environmental adaptability in service environment and can meet the requirements of the fist turn.