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Protective property of epoxy coatings containing polyaniline and laminar basalt in neutral, alkaline, and acidic media

It is very important to develop high performance composite coatings for efficient protection of metals from corrosion. In this work, high performance protection coatings on mild steel using epoxy as matrix containing polyaniline (PANI) and a newly developed laminar basalt (LB) were prepared and characterized. The contact angle, water absorption, adhesion strength, and passive property of the coating were also evaluated. The protection ability of these coatings on mild steel, exposed to 12 wt% sodium chloride (NaCl), 10 wt% sodium hydroxide (NaOH), and 10 wt% hydrochloric acid (HCl) solutions were monitored using electrochemical impedance spectroscopy (EIS), respectively. In neutral solution, the coating containing both PANI and LB (C‐PANI‐LB) offered very high corrosion protection performance and its impedance at 0.01 Hz was higher than 4.1 × 1010 Ω · cm2 after immersed for 60 days. However, in alkaline or acidic solution, C‐PANI‐LB behaved poorer than pure epoxy coating or PANI contained coatings, which were ascribed to the hydrolysis of LB and deterioration of the epoxy binder in these media.

Protective coatings incorporated with platelike inorganic fillers usually exhibit substantial enhancement in physical and chemical properties, including thermal stability, flame retardance, barrier resistance and stress corrosion prevention. The pathway of oxygen and other corrosion media through the coating matrix are prolonged intensively when the LBs are nearly parallel arranged in coating surface.

Authors:   P. He, J.‐X. Wang, Q. Ma, F.‐Y. Lu, Z. Wang, S.‐C. Wang
Journal:   Materials and Corrosion
Year:   2017
Pages:   n/a
DOI:   10.1002/maco.201609414
Publication date:   04-Sep-2017
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