Journal
SURFACES AND INTERFACES
Volume 24, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.surfin.2021.101078
Keywords
Tannic acid; Environmentally friendly; Conversion film; Iron; Corrosion protection
Categories
Funding
- National Natural Science Foundation of China [21673130, 21603122]
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By utilizing an eco-friendly tannic acid conversion film technology, TA and TA/Zn films were successfully fabricated in this study, demonstrating excellent corrosion protection and enhanced adhesion between the substrate and coating.
Because traditional chromating and phosphating processes are harmful to the environment and human health, an eco-friendly tannic acid (TA)-based conversion film technology is established by adopting a new self-assembly strategy of TA/metal complexes on iron surfaces in aqueous solutions. In this study, TA and TA/Zn films were conveniently fabricated by anchoring a certain amount of TA molecules on the iron surface through the coordination interaction between phenolic hydroxyls and metal ions. In contrast, the introduction of Zn ions in the film-forming process cannot only complex with more TA molecules to form a thicker conversion film but also accelerate the film-forming process and transform into ZnO, which can further inhibit iron corrosion. This combination leads to the excellent corrosion protection of TA/Zn film-modified iron (the corrosion protection efficiency is up to 92.39%). Moreover, impact tests show that the TA/Zn film can enhance the adhesion between the iron substrate and outer coating.
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