TY - JOUR
T1 - Hydrophobic Antioxidant Polymers for Corrosion Protection of an Aluminum Alloy
AU - Hlushko, Hanna
AU - Cubides, Yenny
AU - Hlushko, Raman
AU - Kelly, Taylor M.
AU - Castaneda, Homero
AU - Sukhishvili, Svetlana A.
N1 - Funding Information:
The authors acknowledge the financial support of Texas A&M Experiment Station (TEES) and the US DoD Office of Corrosion Policy and Oversight through the University of Akron. We thank Dr. Karaman (TAMU) for providing us access to the Keyence digital VH-Z100 optical microscope and Dr. Lutkenhaus for providing us access to KLA Tencor-100 stylus profilometer. Use of the TAMU Materials Characterization facility is acknowledged. We thank Victoria Albright for useful comments on the manuscript.
Publisher Copyright:
Copyright © 2018 American Chemical Society.
PY - 2018/11/5
Y1 - 2018/11/5
N2 - We explore synthetic polymeric antioxidants as powerful inhibitors of corrosion of metals. Antioxidant copolymers were designed to have polyphenol, gallol, or catechol moieties along with hydrophobic groups brought by hexyl methacrylamide units. The polymers were deposited on aluminum alloy 2024-T3 as submicrometer thick films of individual polymers or as 10 wt % additives to epoxy-based ∼100 μm thick coatings. Thin antioxidant polymer films provided significant corrosion protection of AA2024. Unlike poly(hexyl methacrylamide), which lacked polyphenol functional units, the antioxidant polymers were compatible with standard epoxy coatings and provided exceptional protection of surfaces in extreme corrosion conditions (0.6 M NaCl solution) for over 100 days. Anticorrosion performance of antioxidant-containing coatings was characterized using scanning electron microscopy, optical microscopy, and electrochemical impedance spectroscopy (EIS) and further evaluated with the equivalent electrical circuit analysis of the EIS data. Importantly, unlike small-molecule analogues, such as tannic acid, antioxidant copolymers were not leachable from epoxy coatings into water or ethanol. Taken together, these results show that antioxidant copolymers are efficient materials for protection of metals against corrosion.
AB - We explore synthetic polymeric antioxidants as powerful inhibitors of corrosion of metals. Antioxidant copolymers were designed to have polyphenol, gallol, or catechol moieties along with hydrophobic groups brought by hexyl methacrylamide units. The polymers were deposited on aluminum alloy 2024-T3 as submicrometer thick films of individual polymers or as 10 wt % additives to epoxy-based ∼100 μm thick coatings. Thin antioxidant polymer films provided significant corrosion protection of AA2024. Unlike poly(hexyl methacrylamide), which lacked polyphenol functional units, the antioxidant polymers were compatible with standard epoxy coatings and provided exceptional protection of surfaces in extreme corrosion conditions (0.6 M NaCl solution) for over 100 days. Anticorrosion performance of antioxidant-containing coatings was characterized using scanning electron microscopy, optical microscopy, and electrochemical impedance spectroscopy (EIS) and further evaluated with the equivalent electrical circuit analysis of the EIS data. Importantly, unlike small-molecule analogues, such as tannic acid, antioxidant copolymers were not leachable from epoxy coatings into water or ethanol. Taken together, these results show that antioxidant copolymers are efficient materials for protection of metals against corrosion.
KW - Aluminum 2024-T3
KW - Antioxidant polymers
KW - Catechol
KW - Epoxy coatings
KW - Gallol
KW - Localized corrosion
UR - https://www.scopus.com/pages/publications/85055254756
U2 - 10.1021/acssuschemeng.8b02966
DO - 10.1021/acssuschemeng.8b02966
M3 - Article
AN - SCOPUS:85055254756
SN - 2168-0485
VL - 6
SP - 14302
EP - 14313
JO - ACS Sustainable Chemistry and Engineering
JF - ACS Sustainable Chemistry and Engineering
IS - 11
ER -