Open AccessEvaluation of coating performance on carbon steel A-36 in copper concentrate environment using electrochemical impedance spectroscopy
Author(s) -
Ahmad Fauzi,
Ahmad Zakiyuddin
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/882/1/012063
Subject(s) - epoxy , coating , materials science , dielectric spectroscopy , carbon steel , corrosion , polyurethane , zinc phosphate , copper , composite material , layer (electronics) , zinc , electrochemistry , metallurgy , chemistry , electrode
The presence of chalcopyrite increases the corrosion rate of carbon steel through a galvanic couple. In this study, five organic coating systems were evaluated for their strength against consequent corrosion in the presence of copper concentrate by electrochemistry impedance spectroscopy (EIS) measurement. The coating system studied are a single application epoxy coating (C1); a three-layer epoxy system with zinc-rich epoxy primer base coat, surface tolerant epoxy middle layer, and a top layer polyurethane (C2); a three-layer epoxy system that has the advantages of fast dry time consist of epoxy zinc phosphate base coat primer, the middle layer of the epoxy primer containing the pigment zinc phosphate and top layer polyurethane (C3); metallic pigmented polyurethane coating (C4), and an epoxy coating which can be applied to wet surfaces or in water (C5). All those systems have been tested by the EIS. The test results showed that C2, C3, C4, and C5 coating systems maintained good barrier properties during the immersion process, the low frequency |Z| is more than 10 8 Ω.cm 2 after 30 days of immersion exposure. Epoxy modified coating (C1) had the lowest impedance with resistance under 10 6 Ω.cm 2 provide poor corrosion protection.