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Crankcase is an important part of civil turbofan engine. In this case, some turbofan engine crankcase nuts were found failure during the manufacture process. Compared to new nuts, with Cd coating to avoid the electrochemical corrosion between different matels, the coating in failure nuts was mottled and dis-continuent, with scanning electron microphotography, the matrix was opposed and indentified. So some results was collected that, the aluminum alloy crankcase was process by alodine treatments for anti-corrosion, but the steel nuts were never move out during the treatments process. So the coating in nuts was erosion and drop from matrix. During the assembling process, the nuts were extrusion and failure. Keywords—Alodine treatment; Aluminium alloy; steel; Hydrogen embrittlement; aircraft engine

Failure Analysis of Engine Crankcast Bolts Treated by Alodine Anodic Technology