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Polyaspartic acid as a green corrosion inhibitor for carbon steel

✍ Scribed by R. Cui; N. Gu; C. Li

Publisher
John Wiley and Sons
Year
2010
Tongue
German
Weight
328 KB
Volume
62
Category
Article
ISSN
0947-5117

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✦ Synopsis

The inhibitor effect of the environmentally friendly corrosion inhibitor polyaspartic acid (PASP) on the corrosion of carbon steel in 0.5 M H 2 SO 4 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 8C. 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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