Abstract
Different manufacturing and surface modification treatments distinctively affect the surface characteristics and microstructure of the workpiece, having a different impact on their effective life-span. The corrosion-fatigue behavior of as-machined (wire-EDM), blasted and anodized aluminum alloy 7075-T651 was investigated using 3.5wt% NaCl aqueous solution and distilled water as corrosive media. An in-situ corrosion-fatigue device capable of producing cyclic loads in a corrosive solution was employed, coupled with FEM analysis. Blasting process offered a prolongation of the corrosion-fatigue life-span in both corrosive media, when compared to the as-machined samples under identical conditions. Anodizing had a deleterious effect in all the examined cases.
Highlights
The aluminum alloy 7075-T651 is among the most widely used alloys in aerospace applications up to date, due to its light weight and high strength
The development of appropriate surface modification treatments that can improve the corrosion resistance and fatigue strength is pivotal for engineering applications [1,2]
The anodic aluminum oxide layer adheres well on the substrate layer, due to its compact inner layer which is beneficial to corrosion resistance, the porous outer layer can lead to the propagation of cracks into the substrate, that are formed due to its brittle nature
Summary
The aluminum alloy 7075-T651 is among the most widely used alloys in aerospace applications up to date, due to its light weight and high strength. The AA7075-T651 contains a high number of intermetallic particles that are detrimental to the corrosion properties of the alloy. The development of appropriate surface modification treatments that can improve the corrosion resistance and fatigue strength is pivotal for engineering applications [1,2]. Anodizing is a common protection method against corrosion. The anodic aluminum oxide layer adheres well on the substrate layer, due to its compact inner layer which is beneficial to corrosion resistance, the porous outer layer can lead to the propagation of cracks into the substrate, that are formed due to its brittle nature. This, results in a dramatic reduction of the fatigue durability of the metal [4]
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