The effect of electroless Ni-P coatings on the fatigue life of Al 7075-T6 fastener holes with symmetrical slits

Mohamed Rahmat, Reza Oskouei, Raafat Ibrahim, Raman Singh

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    In this paper, the fatigue behaviour of Al 7075-T6 fastener holes with symmetrical through slits was studied. The holes were coated with electroless nickel (EN) plating with a high phosphorous content of 10-13 wt% and a thickness of 40 μm. Uncoated open-hole, EN coated open-hole, uncoated bolted hole and EN coated bolted hole specimens were fatigue tested. Bolted samples were clamped with a high tightening torque of 7 Nm. The established S-N curves showed 282-1348% improvements in the fatigue life due to the combined effect of EN coating and bolt clamping, depending on the level of maximum alternating stress. Excellent adhesion was observed between the coating and the aluminium substrate along the crack path. Tensile tests results showed a considerable reduction of 54% in the ductility of the coated material while both the yield and ultimate strengths were found to slightly increase by approximately 6% in comparison with the uncoated aluminium alloy.

    Original languageEnglish
    Pages (from-to)30-38
    Number of pages9
    JournalInternational Journal of Fatigue
    Volume52
    DOIs
    Publication statusPublished - 2013

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