Improving the corrosion resistance of epoxy coatings

In a study, the synergistic effect of polyaniline grafted basalt plates on the corrosion resistance of epoxy coatings was investigated.

Improving the corrosion resistance of epoxy coatings. Source: Pixabay -

Polyaniline-graft-basalt plates (PANI-g-BP) were prepared based on γ-aminopropyltriethoxysiliane-modified basalt plates via in-situ chemical-oxidation polymerisation method. Three PANI-g-BP samples were prepared by varying the ratio of aniline to BP (1:2, 1:4, 1:6). The results of FTIR, SEM and TGA confirmed that PANI was successfully grafted on the surface of basalt plates.

Dramatic improvement with 10% PANI-g-BP

Different coatings were prepared by adding the synthesised PANI-g-BPs or PANI, and were coated on the mild steel subsequently. The water-uptake property, the adhesion strength and the passive properties of the coatings were investigated. In addition, the protective performance of the coatings was tested by EIS in 12% NaCl solution at 95°C. The results indicated that the coatings with 10% PANI-g-BP (1:4) exhibited the best protective performance and its impedance at 0.01 Hz is higher than 1010 after 80 days immersing.

The study is published in: Progress in Organic Coatings, Volume 110, September 2017, Pages 1–9

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