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<p>Corrosion is the most severe predicament for aluminum alloys, especially; exfoliation corrosion. Surface texture is one the most prevailing factors that leverage the exfoliation susceptibility in Al7075 components in the aviation industry. In the present investigation, the amplitude and spacing roughness parameters; <i>R</i><sub>t</sub> and <i>R</i><sub>Sm</sub>, of Al7075 specimens were measured, followed by their measurement uncertainty evaluation: To ascertain the reliability of associated outcomes, and correlated with the corrosion attributes. The effect of <i>R</i><sub>t</sub>, and <i>R</i><sub>Sm</sub>, produced by turning operation on Al7075 samples, on exfoliation corrosion by laboratory immersion EXCO testing, has been explored. The aluminum 7075 alloy sample 3 (<i>R</i><sub>Sm</sub>: 0.166&#xa0;mm ± 8.91% and <i>R</i><sub>t</sub>: 6.599&#xa0;µm ± 9.87%) demonstrated a corrosion rate of 3.803&#xa0;mm/year which was 2.9 and 0.47 times higher than the corrosion rate of sample 1 (<i>R</i><sub>Sm</sub>: 0.129&#xa0;mm ± 6.87% and <i>R</i><sub>t</sub>: 5.875&#xa0;µm ± 11.43%) and sample 2 (<i>R</i><sub>Sm</sub>: 0.151&#xa0;mm ± 20.02% and <i>R</i><sub>t</sub>: 6.013&#xa0;µm ± 13.36%) respectively. The outgrows of this experimental investigation establish a relevant interrelationship between surface roughness and exfoliation corrosion.</p>

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Experimental Investigation for Exfoliation Corrosion Susceptibility of Al7075 and Its Correlation with Surface Roughness

  • 期刊论文

  • 发表日期：

    2025年3月29日

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  • Boya Murali,
  • Girija Moona,
  • Sandeep Kumar,
  • K. Kalyani Radha,
  • Harish Kumar,
  • Jitendra Kumar

摘要

Corrosion is the most severe predicament for aluminum alloys, especially; exfoliation corrosion. Surface texture is one the most prevailing factors that leverage the exfoliation susceptibility in Al7075 components in the aviation industry. In the present investigation, the amplitude and spacing roughness parameters; Rt and RSm, of Al7075 specimens were measured, followed by their measurement uncertainty evaluation: To ascertain the reliability of associated outcomes, and correlated with the corrosion attributes. The effect of Rt, and RSm, produced by turning operation on Al7075 samples, on exfoliation corrosion by laboratory immersion EXCO testing, has been explored. The aluminum 7075 alloy sample 3 (RSm: 0.166 mm ± 8.91% and Rt: 6.599 µm ± 9.87%) demonstrated a corrosion rate of 3.803 mm/year which was 2.9 and 0.47 times higher than the corrosion rate of sample 1 (RSm: 0.129 mm ± 6.87% and Rt: 5.875 µm ± 11.43%) and sample 2 (RSm: 0.151 mm ± 20.02% and Rt: 6.013 µm ± 13.36%) respectively. The outgrows of this experimental investigation establish a relevant interrelationship between surface roughness and exfoliation corrosion.