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

Abstract : 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.
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Submitted on : Thursday, November 7, 2019 - 1:42:46 PM
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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⟩

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