2011
DOI: 10.1016/j.matdes.2011.02.027
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Surface characterization and influence of anodizing process on fatigue life of Al 7050 alloy

Abstract: The present study investigates the influence of anodizing process on fatigue life of aluminium alloy 7050-T7451 by performing axial fatigue tests at stress ratio 'R' of 0.1. Effects of pre-treatments like degreasing and pickling employed prior to anodizing on fatigue life were studied. The post-exposure surface observations were made by scanning electron microscope (SEM) to characterize the effect of each treatment before fatigue testing. The surface observations have revealed that degreasing did not change th… Show more

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Cited by 65 publications
(30 citation statements)
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“…However, localized dissolution tends to occur around intermetallic particles and precipitates during anodization. The oxidation rate is faster with large intermetallic particles such as the Mg 2 Si, Al 2 Cu, Al 7 Cr, ¢-AlMg and AlZnMg than in the aluminum matrix, meaning that the particles could dissolve into the electrolyte during the anodizing treatment. 5,6) On the other hand, immobile elements such as silicon will form silicon containing particles that will be trapped in the AAO film.…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…However, localized dissolution tends to occur around intermetallic particles and precipitates during anodization. The oxidation rate is faster with large intermetallic particles such as the Mg 2 Si, Al 2 Cu, Al 7 Cr, ¢-AlMg and AlZnMg than in the aluminum matrix, meaning that the particles could dissolve into the electrolyte during the anodizing treatment. 5,6) On the other hand, immobile elements such as silicon will form silicon containing particles that will be trapped in the AAO film.…”
Section: Introductionmentioning
confidence: 99%
“…Pitting that preferentially occurs at the interface between the silicon/iron particles and reduces the corrosion resistance of the films. Effect of anodization on the fatigue life of 7050-T7451 alloys has been studied and discussed by Sharzad et al 7) They found that the inclusion particles trapped in the AAO film had a significant effect on the formation of corrosion pits, which accelerated fatigue crack initiation. As a result, the fatigue life of the aluminum alloy was reduced.…”
Section: Introductionmentioning
confidence: 99%
“…Chromic acid anodizing (CAA) and sulfuric acid anodizing (SAA) treatments are the most important technologies needed to produce an anodized coating. Although the anodizing process, in which oxide layer is artificially grown from the substrate, creates better adhesion compared with deposited coating, the anodic film has a detrimental effect on high cycle fatigue performance [1]. Lonyuk [2] demonstrated that the fatigue strength of 7475 alloy decreased up to 75% for a 60-lm thick coating caused by the stress concentration at the microcracks in the coating.…”
Section: Introductionmentioning
confidence: 99%
“…During anodizing, the anions in the electrolyte migrate to the anode where they are discharged. There are reports indicating that anodized layers can act as stress raisers, contributing as nucleation sites for FCP in aluminum and titanium alloys (Shahzad, Chaussumier, Chieragatti, Mabru, & Rezai-Aria, 2011;Wang et al, 2009). Anodic films grown by microarc oxidation (MAO) processes have been developed as a method of controlling the degradation rate of biomedical magnesium alloys.…”
Section: Anodizingmentioning
confidence: 99%