THE EFFECT OF ELECTROLYTE TEMPERATURE AND SEALING SOLUTION IN ANODIZING OPERATION ON HARDNESS AND WEAR BEHAVIOR OF 7075 -T6 ALUMINUM ALLOY

Saeed Niyazbakhsh, Kamran Amini and Farhad Gharavi
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Saeed Niyazbakhsh: Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran
Kamran Amini: Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran†Department of Mechanical Engineering, Tiran Branch, Islamic Azad University, Isfahan, Iran
Farhad Gharavi: #x2021;Department of Materials Engineering, Sirjan Branch, Islamic Azad University, Sirjan, Iran

Surface Review and Letters (SRL), 2019, vol. 26, issue 02, 1-7

Abstract: Anodic oxide coatings are applied on aluminum alloys in order to improve corrosion resistance and to increase hardness and wear resistance. In the current study, a hard anodic coating was applied on AA7075-T6 aluminum alloy. To survey the anodizing temperature (electrolyte temperature) effect, three temperatures, namely, −5∘C, 0∘C and 5∘C were chosen and the samples were sealed in boiling water and sodium dichromate to study the role of sealing. For measuring the oxide coatings porosity and hardness and also for comparing the samples’ wear resistance field-emission scanning electron microscopy (FESEM), microhardness test and pin-on-disk method were utilized, respectively. The results showed that by increasing the anodizing temperature, hardness and consequently wear resistance decreased so that hardness and weight loss in the samples with no sealing decreased from 460HV and 0.61mg at −5∘C to 405 and 358HV and 1.05 and 1.12mg at 0∘C and 5∘C, respectively, which is due to the porosity increment by increasing the anodizing temperature. Also, sealing in boiling water and dichromate contributed to soft phases and coating hydration, which resulted in a decrease in hardness and wear resistance. Hardness and weight loss in the coated samples at −5∘C decreased from 460HV and 0.61mg in the samples with no sealing to 435 and 417HV and 0.72 and 0.83mg in the samples sealed in boiling water and dichromate, respectively.

Keywords: 7075 aluminum alloy; anodizing; wear behavior; hardness (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1142/S0218625X18501433

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