(Key Laboratory of Marine Materials and Related Technologies, Chinese Academy of Sciences,Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province, Ningbo Institute of Industrial Technology of the Chinese Academy of Sciences, Ningbo 315201, China)
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DOI:
10.7502/j.issn.1674-3962.2016.08.10
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Abstract:
During the acid pickling process of metal pipeline and boiler, the corrosion of metal is inevitable. Inhibitor is the most effective and economical way to decrease the corrosion rate of metal．Aniline oligomer possesses reversible redox performance，which enables them to be the new anticorrosion agents，and their anticorrosion performance has attracted intense attentions. Aniline oligomer is an important metal corrosion inhibitor. A water soluble inhibitor, H3PO4 doped PANi nanoparticle, was synthesized by dispersion polymerization technology. The corrosion performance and corrosion mechanism of PANi nanoparticle on carbon steel in 1 mol/L HCl were investigated by polarization curves and electrochemical impendence spectroscopy (EIS). The corrosion product morphology and corrosion product components of carbon steel were also analyzed by electron scanning microscope(SEM) and energy dispersive spectroscopy (EDS). Results indicated that H3PO4 doped PANi nanoparticle is an anodic corrosion inhibitor which formes a compact film on carbon steel surface and then inhibits the erosion of Cl-. When the concentration of inhibitor is 05 g/L, its inhibition efficiency reaches 949% after 120 min.