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<p>Chromate-free corrosion inhibitors are important to establish non-toxic coating formulations for high strength aluminum alloys. A commercially sourced protected benzotriazole (BTA) based corrosion inhibitor was loaded into a 2K epoxy-amine matrix. The coating formulation was then systematically varied—inhibitor loading (IL), epoxy-to-amine ratio (EP:NH<sub>2</sub>), filler type (FT), and filler amount (FA). In the formulation, BaSO<sub>4</sub> and TiO<sub>2</sub> were used as filler/pigments. The leaching behavior of BTA from free coating films was evaluated in de-ionized water. It was shown that the commercially sourced protected inhibitor could successfully be incorporated into the 2K epoxy-amine matrix and up to 77% of the inhibitor was released from the free films during the immersion in de-ionized water. The paint formulation impacted the leaching up to a factor of 9 with regards to the leached inhibitor fraction and up to a factor of 3 in terms of half time of leaching. FA had the most significant effect on overall inhibitor leaching.</p>

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Investigation of influence factors on the leaching behavior of protected benzotriazole from active corrosion protection coatings

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Pelin Duru,
  • Malte Burchardt,
  • Markus Jordan,
  • Bernd Mayer

摘要

Chromate-free corrosion inhibitors are important to establish non-toxic coating formulations for high strength aluminum alloys. A commercially sourced protected benzotriazole (BTA) based corrosion inhibitor was loaded into a 2K epoxy-amine matrix. The coating formulation was then systematically varied—inhibitor loading (IL), epoxy-to-amine ratio (EP:NH2), filler type (FT), and filler amount (FA). In the formulation, BaSO4 and TiO2 were used as filler/pigments. The leaching behavior of BTA from free coating films was evaluated in de-ionized water. It was shown that the commercially sourced protected inhibitor could successfully be incorporated into the 2K epoxy-amine matrix and up to 77% of the inhibitor was released from the free films during the immersion in de-ionized water. The paint formulation impacted the leaching up to a factor of 9 with regards to the leached inhibitor fraction and up to a factor of 3 in terms of half time of leaching. FA had the most significant effect on overall inhibitor leaching.