Microcontainers with 3-amino-1,2,4-triazole-5-thiol for Enhancing Anticorrosion Waterborne Coatings for AA2024-T3

• Published in: Progress in organic coatings 2019-12, Vol.137, p.105336, Article 105336
• Main Authors: Soleymanibrojeni, Mohammad, Shi, Hongwei, Udoh, Inime Ime, Liu, Fuchun, Han, En-Hou
• Format: Article
• Language: English
• Subjects: Active corrosion protection; Aluminum base alloys; Corrosion; Corrosion inhibitors; Corrosion prevention; Corrosion resistance; Corrosion resistant alloys; EIS; Maintenance management; Organic coatings; Organic inhibitor; Penetration resistance; Performance enhancement; Polyelectrolyte deposition; Protective coatings; Substrates; SVET; Triazoles
• ISSN: 0300-9440; 1873-331X
• DOI: 10.1016/j.porgcoat.2019.105336

•ATAT in smart microcontainers was used to develop anticorrosion coatings for AA20204-T3.•The release of ATAT from microcontainers protected the oxide layer of the substrate.•Direct addition of ATAT in the epoxy coating formula causes the loss of inhibition of ATAT. Using organic coatings with high barrier property in combination with active corrosion protection can improve corrosion protection of aluminum alloys. In this work, 3-Amino-1,2,4-triazole-5-thiol (ATAT) was used as organic inhibitor in developing anticorrosion coatings for AA2024-T3. The delivery of ATAT was achieved by using smart microcontainers with ATAT that respond to pH change caused by corrosion reaction at the coating-substrate interface. The developed coatings with low concentration of smart microcontainers showed a slight reduction of barrier properties, but gained active corrosion protection capability. The resistance of the coatings reduced the rate of penetration of corrosive species and the active corrosion protection stopped the damaging reactions at the coating-substrate interface. The active corrosion protection is also evident in the case of coatings with mechanical damages, when the barrier property of coatings is compromised. Waterborne coatings with smart microcontainers for delivery of ATAT exhibited enhanced performance for corrosion protection of AA2024-T3.