Abstract
Rotating bending fatigue tests were carried out by using the 7075-T7351 Al alloy with a microarc oxidation (MAO) coating (h = 10 μm) and with no coating. Tests were conducted in air and 5.0% NaCl aqueous solution conditions. The fatigue microscopic fracture behavior of the metals was investigated by using scanning electron microscope and three-dimensional digital microscope technologies. The empirical formulas between the stress intensity factor ΔK and the fatigue life Nf in the different conditions were obtained. In addition, the reason for data scattering in the fatigue lives of uncoated 7075-T7351 samples under the same stress amplitude in air was analyzed. Furthermore, the fatigue characteristic life of 7075-T7351 alloy was predicted by the three-parameter Weibull distribution model.
Highlights
Al alloys have received much attention in the past several decades because of their excellent properties, such as high strength-to-weight ratio and recyclability [1,2,3,4,5,6,7,8,9,10,11,12]
Summarized roundly that the AC-pulse microarc oxidation (MAO) treatment of Al alloys in a suitable passivating electrolyte allows the formation of relatively thick and hard
Wang et al [3,4,5] reported that MAO coating through retreatment of a pore-sealing by epoxy resin can improve the mechanical fatigue strength, and the corrosion fatigue strength of Al alloys within the limits of Metals 2018, 8, 210; doi:10.3390/met8040210
Summary
Al alloys have received much attention in the past several decades because of their excellent properties, such as high strength-to-weight ratio and recyclability [1,2,3,4,5,6,7,8,9,10,11,12]. For the inferior properties of Al alloys (especially high-strength Al alloys), improvement methods based on various surface treatment technologies (including protective coatings) have been given attention in the past several decades [1,2,3,4,5,6,7]. Wang et al [3,4,5] reported that MAO coating through retreatment of a pore-sealing by epoxy resin can improve the mechanical fatigue strength, and the corrosion fatigue strength of Al alloys within the limits of Metals 2018, 8, 210; doi:10.3390/met8040210 www.mdpi.com/journal/metals
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