Research on Corrosion Analysis and Improvement Measures of Typical Electric Lap Joints in Helicopters
To ensure the long-term reliable use of typical electric lap joints of helicopters in the marine environment,this paper selected the copper strips and aluminum alloy electrical lap joints in a semi-enclosed structural area.According to the specific environmental spectrum of the accelerated test in the marine environment,an accelerated test consisting of 10 cycles was conducted.After the 4th cycle of the test,the corrosion depth of the aluminum alloy exceeded 10%of its total thickness.After the 10th cycle of the accelerated test,the corrosion depth exceeded 90%of the total thickness,indicating a relatively severe degree of corrosion.Through the analysis of the causes of corrosion,it was found that the poor sealing effect at the lap joint was the key factor leading to the corrosion.By improving the size and process of the fillet seal,the copper strips and aluminum alloy electrical lap joints successfully passed the 10-cycle accelerated test evaluations,and the improvement measures effectively enhanced the corrosion resistance of the copper strips and aluminum alloy electrical lap joints in the marine environment.
typical electric lap jointsdissimilar metalsfillet sealingcorrosion resistanceaccelerated test environmental
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