Polyaspartic acid as a green corrosion inhibitor for carbon steel |
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| Authors: | R Cui N Gu C Li |
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| Affiliation: | 1. Department of Chemistry, Hebei Normal University, Shijiazhuang 050016 (P.R. China);2. Department of Chemistry and Materials Engineering, Changshu Institute of Technology, Changshu 215500 (P.R. China) |
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| Abstract: | The inhibitor effect of the environmentally friendly corrosion inhibitor polyaspartic acid (PASP) on the corrosion of carbon steel in 0.5 M H2SO4 was investigated by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). Polarization curve results clearly reveal the fact that PASP is a good anode‐type inhibitor. EIS results confirm its corrosion inhibition ability. The inhibition efficiency increases with increasing PASP concentration, and the maximum inhibition efficiency was 80.33% at 10 °C. SEM reveals that a protective film forms on the surface of the inhibited sample. The adsorption of this inhibitor is found to follow the Freundlich adsorption isotherm. A mechanism is proposed to explain the inhibitory action of the corrosion inhibitor. |
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| Keywords: | electrochemical impedance spectroscopy Freundlich‐type isotherm green corrosion inhibition polyaspartic acid |
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