8-hydroxyquinoline-modified clay incorporated in an epoxy coating for the corrosion protection of carbon steel

Trinh Anh Truc (1) , Thai Thu Thuy (1) , Vu Ke Oanh (1) , To Thi Xuan Hang (1) , Anh Son Nguyen (1, 2) , Nicolas Caussé (2) , Nadine Pébère (2)

1 VAST - Vietnam Academy of Science and Technology
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

In the present work, a well-known corrosion inhibitor (8-hydroxyquinoline (8HQ)) was inserted within the montmorillonite platelets (8HQ-MMT) and the modified clay was incorporated (3 wt.%) into a solvent-free epoxy coating which was afterwards deposited on carbon steel substrates. First, the inhibitive action of 8HQ was investigated by electrochemical methods carried out on a bare carbon steel rotating disk electrode in a 0.1 M NaCl solution. Then, electrochemical impedance measurements were performed to assess the effect of the 8HQ-MMT in the epoxy coating for the corrosion protection. The results were compared with a reference sample constituted by the epoxy coating containing an ammonium quaternary salt-modified clay. It was shown that the two coatings presented good barrier properties. Dry and wet adherence measurements revealed an improvement of the adherence when the 8HQ-MMT was incorporated into the coating by comparison with the reference sample. It was concluded that the 8HQ mainly had an effect at the metal/coating interface but its concentration was too low to afford significant corrosion protection of the carbon steel.

Mots clés: Montmorillonite; Electrochemical impedance spectroscopy; Barrier properties; Adhesion; Corrosion inhibition

Domaines: Matériaux

Trinh Anh Truc, Thai Thu Thuy, Vu Ke Oanh, To Thi Xuan Hang, Anh Son Nguyen, et al.. 8-hydroxyquinoline-modified clay incorporated in an epoxy coating for the corrosion protection of carbon steel. Tribology - Materials, Surfaces & Interfaces, 2019, 14, pp.26-33. ⟨10.1016/j.surfin.2018.10.007⟩. ⟨hal-02353640⟩