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<p>Understanding substrate–coating interactions is crucial for designing durable, corrosion-resistant systems. This study investigates the effects of surface treatments— polishing, acid etching, and alkaline etching—on AA6061 aluminum alloy and its thermally grown boehmite coatings. Surface treatments were found to significantly alter boehmite film properties by modifying the alloy’s surface composition. X-ray photoelectron spectroscopy revealed a 10% alumina drop after acid etching alongside chemisorbed species formation in wet treatments. Structural analysis, including grazing incidence X-ray diffraction and TEM, showed α-Al₂O₃ formation on polished surfaces, improving wear resistance but inducing cathodic <i>E</i><sub>corr</sub> shifts, pointing to higher corrosion susceptibility. In contrast, acid and alkaline etching produced anodic <i>E</i><sub>corr</sub> shifts with stable, pit-free films observed via potentiodynamic scans. Electrochemical impedance spectroscopy highlighted reduced oxide resistance with extended boehmite growth. The findings emphasize the role of surface pre-treatments and boehmite optimization in balancing durability and corrosion resistance for AA6061 substrates.</p><p></p>

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Influence of AA6061 surface preparation on the resistance to surface degradation of thermally grown boehmite films

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年9月22日

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  • Lyndi E. Strange,
  • Sridhar Niverty,
  • Vaithiyalingam Shutthanandan,
  • Mark Bowden,
  • Shalini Tripathi,
  • Mayur Pole,
  • Rick Shimskey,
  • Jonathan Wierscheke,
  • Vineet V. Joshi

摘要

Understanding substrate–coating interactions is crucial for designing durable, corrosion-resistant systems. This study investigates the effects of surface treatments— polishing, acid etching, and alkaline etching—on AA6061 aluminum alloy and its thermally grown boehmite coatings. Surface treatments were found to significantly alter boehmite film properties by modifying the alloy’s surface composition. X-ray photoelectron spectroscopy revealed a 10% alumina drop after acid etching alongside chemisorbed species formation in wet treatments. Structural analysis, including grazing incidence X-ray diffraction and TEM, showed α-Al₂O₃ formation on polished surfaces, improving wear resistance but inducing cathodic Ecorr shifts, pointing to higher corrosion susceptibility. In contrast, acid and alkaline etching produced anodic Ecorr shifts with stable, pit-free films observed via potentiodynamic scans. Electrochemical impedance spectroscopy highlighted reduced oxide resistance with extended boehmite growth. The findings emphasize the role of surface pre-treatments and boehmite optimization in balancing durability and corrosion resistance for AA6061 substrates.