4.6 Article

Electrochemical characterization of anti-corrosion coatings formed on 6061 aluminum alloy by plasma electrolytic oxidation in the corrosion inhibitor-enriched aqueous solutions

期刊

ELECTROCHIMICA ACTA
卷 424, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2022.140652

关键词

Aluminum alloy; Plasma electrolytic oxidation; Corrosion inhibitor; Electrochemical impedance spectroscopy; Potentiodynamic polarization

资金

  1. National Science Centre, Poland [UMO-2016/23/N/ST5/02022]
  2. Patryk Zaj?c

向作者/读者索取更多资源

In this study, the 6061 aluminum alloy was surface-treated using plasma electrolytic oxidation (PEO) to provide long-lasting corrosion protection. Selected corrosion inhibitors were incorporated into the oxide coating either by adding them directly to the electrolyte or through a sequential PEO process. The results showed that acrylic acid-modified coatings provided the best protection, and the sequential PEO method had more reproducible anti-corrosion effects.
The 6061 aluminum alloy was surface-treated by plasma electrolytic oxidation (PEO) in silicate-and borate based electrolyte systems. The authors attempted to incorporate selected corrosion inhibitors (8-hydroxyquinoline, 2-mercaptobenzothiazole, poly(acrylic acid) with molecular weights of 1800 and 450,000 g mol(-1), and acrylic acid) into the oxide coating to provide long-lasting protection of the substrate. These inhibitors were either added directly to the electrolyte for the treatment or loaded into the coatings through a sequential PEO procedure. Electrochemical corrosion tests showed that acrylic acid-modified coatings provided the best protection. In general, of the two methods, the sequential PEO gave more reproducible anti-corrosion effects.

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