Rotating Bending Fatigue Endurance and Effect of Controlled Corrosion on the AISI-SAE 6063-T5 Aluminum Alloy
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Rotating Bending Fatigue Endurance and Effect of Controlled Corrosion on the AISI-SAE 6063-T5 Aluminum Alloy. G. M. Domínguez Almaraz1, J. L. Ávila Ambriz1, E. Cadenas Calderón1, J. J. Villalón López1 1 Facultad de Ingeniería Mecánica, Universidad Michoacana de San Nicolás de Hidalgo (UMSNH), Santiago Tapia No. 403, Col. Centro, Morelia, Michoacán 58000, México. ABSTRACT Rotating bending fatigue test are carried out on the aluminum alloy 6063-T5 for corroded and non corroded specimens. Special attention is devoted to fatigue endurance reduction caused by controlled surface corrosion on corroded specimens. Corrosion attack is implemented by submersion of specimens in an acid solution for: two, four and six minutes in order to induce three degrees of surface corrosion. The corrosion agent is a solution of hydrochloric acid with a PH close to 0.8 and solution concentration of 38%. Rotating bending fatigue tests at frequency of 50 Hz, room temperature and without environmental humidity control are carried out on 4 types of specimens: without corrosion and 2, 4, and 6 minutes immersed in the solution of hydrochloric acid. Results are analyzed regarding the corrosion effect on fatigue endurance and conclusion are enlisted concerning rotating bending fatigue tests and corrosion attack on this aluminum alloy. INTRODUCTION Industrial applications of aluminum alloy 6063-T5 are mainly oriented to: aluminum extruded parts in car industry, architectural extrusions, irrigation system pipelines, electrical conductors >1,2,3@. This alloy presents high surface polish, good welding properties, corrosion resistance and it is typically produced with very smooth surfaces fit for anodizing. Usually, this aluminium alloy undergoes mechanical and environmental loads (corrosion) in most of its applications >4@ and some coating development has been introduced recently in order to improve its mechanical and physical properties >5@; thus, the understanding behavior of this aluminum alloy undergoing mechanical loading and corrosion attack is of principal interests. In the present study rotating bending fatigue tests are carried out on the hourglass shape specimens at the frequency of 50 Hz, without control of environmental humidity and surface roughness; nevertheless, all specimens are machined similarly in order to maintain the surface roughness with no large variation. EXPERIMENTAL DETAILS The rotating bending fatigue machine is shown in Figure 1. It has been developed in our laboratory in order to obtain the fatigue endurance on this aluminium alloy >6@. The high controlled speed of this machine is 150 Hz and stops automatically when the specimen is broken. Additionally, an incorporated electronic system is designed to count the number of cycles and stops simultaneously when the specimen is broken.
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Figure 1. Patented rotating bending fatigue machine. Chemical composition in weigh and principal mechanical properties is shown in Tables 1 a) and b) respectively. Table 1. a) Chemical composition of aluminum alloy 6063-T5.
Table 1. b) Pri
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