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The Effect Of Electrolyte Temperature And Sealing Solution In Anodizing Operation On Hardness And Wear Behavior Of 7075 -T6 Aluminum Alloy

Author

Listed:
  • 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)

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.

Suggested Citation

  • Saeed Niyazbakhsh & Kamran Amini & Farhad Gharavi, 2019. "The Effect Of Electrolyte Temperature And Sealing Solution In Anodizing Operation On Hardness And Wear Behavior Of 7075 -T6 Aluminum Alloy," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 26(02), pages 1-7, February.
    • Handle: RePEc:wsi:srlxxx:v:26:y:2019:i:02:n:s0218625x18501433
    DOI: 10.1142/S0218625X18501433
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