A study on corrosion protection of different polyaniline coatings for mild steel

•The different forms of polyaniline were selected and added in epoxy coating.•The different polyaniline coatings could all offer the corrosion resistance for steel.•The camphorsulfonic acid doped polyaniline coating had the best performance of corrosion protection for steel.•The protective mechanism...

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Bibliographic Details
Published in:Progress in organic coatings 2017-10, Vol.111, p.240-247
Main Authors: Zhang, Yingjun, Shao, Yawei, Liu, Xiaoling, Shi, Chao, Wang, Yanqiu, Meng, Guozhe, Zeng, Xianguang, Yang, Yan
Format: Article
Language:English
Subjects:
Corrosion mechanisms
Corrosion prevention
Corrosion products
Corrosion protection
Corrosion resistance
Corrosion resistant steels
Corrosion tests
EIS
Epoxy coatings
Hydrofluoric acid
Low carbon steels
Mild steel
PANI coating
Polyanilines
Protective coatings
Scanning electron microscopy
Steel
Studies
X ray photoelectron spectroscopy
XPS
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Summary:•The different forms of polyaniline were selected and added in epoxy coating.•The different polyaniline coatings could all offer the corrosion resistance for steel.•The camphorsulfonic acid doped polyaniline coating had the best performance of corrosion protection for steel.•The protective mechanism conferred by the different polyaniline coatings was discussed. The emeraldine base and salt (hydrofluoric acid and camphorsulfonic acid doped) forms of polyaniline (PANI) were synthesized and added to be epoxy coating. The corrosion protection of different PANI coatings was studied by EIS. Results indicated that different PANI coatings could offer the corrosion resistance of mild steel. However, the camphorsulfonic acid-doped PANI coating had the best performance in corrosion protection among the four systems under investigation. The corrosion product layer was analyzed by SEM and XPS, indicating that PANI changed the morphology and component of the corrosion product layer. Moreover, the protective mechanism imparted by PANI was discussed.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2017.06.015