Abstract
We present the results of static and fatigue testing of D16 and V95 aluminum alloys in the as-received state, after model degradation, and after in-service degradation in air and in a corrosive medium (3% NaCl solution). The mechanical and electrochemical characteristics most sensitive to the degradation of these alloys in the process of long-term operation are determined. It is shown that the fatigue life of the specimens of degraded alloys may decrease as compared with the intact state. Thus, for D16chT (D16) alloy, it becomes 1.2-1.4 times shorter in air and 1.5-2 times shorter in the corrosion medium. At the same time, for V95pchT1 (V95T1) alloy, the fatigue life becomes 1.8-2.2 and 2.2-2.6 times shorter, respectively. It is possible to conclude that the fracture resistance of passivating films on the newly formed surfaces under the combined influence of local deformation and hydrogen affects the corrosion-fatigue fracture resistance of D16 and V95 aluminum alloys to a greater extent than the kinetics of formation of these films.
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