INFLUENCE OF CERIUM AND AGING PROCESS ON EXFOLIATION CORROSION OF ALUMINUM - LITHIUM ALLOYS
稀土元素Ce和时效处理对Al-Li合金剥蚀性能的影响

The influence of cerium element,aging process and depletion layer existing on the surface of Al-Li alloy on the exfoliation corrosion of 2090 Al-Li alloy has been investigated.The results show that the exfoliation corrosion resistance of the alloy can be improved by cerium addition in 2090 alloy,but too much addition of cerium is harmful; as the exfoliation corrosion resistance relates closely to the precipitation of T1 phase during aging process,the exfoliation corrosion susceptibility of alloy in the near peak aging condition is higher,and however that in conditions under aging and over aging is lower,the depletion layer existing on the surface of Al-Li alloy can improve the exfoliation corrosion resistance.