Self-healing Anticorrosion Coatings for Gas Pipelines and Storage Tanks
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In the present study, chitosan based self-healing anticorrosion coatings were prepared by layer by layer(lbl) addition of chitosan (Ch) and polyvinyl butyral (PVB) on mild carbon steel substrate. Chitosan coatingsexhibited enhanced coating stability and corrosion resistance in aggressive environments by the applicationof a PVB top layer. Chitosan layer in the lbl coatings have been modified by using glutaraldehyde (Glu)and silica (SiO2). Performance of different coatings was tested using electrochemical impedance spectroscopyand immersion test. The best anticorrosion performance was observed in case of 10 % Ch_SiO2_PVB coatings,which withstand immersion test over 25 days in 0.5 M salt solution without visible corrosion. 10 % Ch_SiO2 coatings without the PVB top layer didn’t last more than 3days. Application of PVB top layer sealedthe defects in the chitosan pre-layer and improved its hydrophobic nature as well. Raman spectra and SEMof steel surfaces after corrosion study and removal of PVB_Ch/Glu_PVB coatings showed a passive layerof iron oxide, attributing to the self-healing nature of these coatings. Conducting particle like graphenereinforcement of chitosan in the lbl coatings enhanced corrosion resistance of chitosan coatings.
Abstract
In the present study, chitosan based self-healing anticorrosion coatings were prepared by layer by layer(lbl) addition of chitosan (Ch) and polyvinyl butyral (PVB) on mild carbon steel substrate. Chitosan coatingsexhibited enhanced coating stability and corrosion resistance in aggressive environments by the applicationof a PVB top layer. Chitosan layer in the lbl coatings have been modified by using glutaraldehyde (Glu)and silica (SiO2). Performance of different coatings was tested using electrochemical impedance spectroscopyand immersion test. The best anticorrosion performance was observed in case of 10 % Ch_SiO2_PVB coatings,which withstand immersion test over 25 days in 0.5 M salt solution without visible corrosion. 10 % Ch_SiO2 coatings without the PVB top layer didn’t last more than 3days. Application of PVB top layer sealedthe defects in the chitosan pre-layer and improved its hydrophobic nature as well. Raman spectra and SEMof steel surfaces after corrosion study and removal of PVB_Ch/Glu_PVB coatings showed a passive layerof iron oxide, attributing to the self-healing nature of these coatings. Conducting particle like graphenereinforcement of chitosan in the lbl coatings enhanced corrosion resistance of chitosan coatings.
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