期刊
PROGRESS IN ORGANIC COATINGS
卷 129, 期 -, 页码 159-170出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2018.12.028
关键词
Polyaspartic acid; Cysteamine; Corrosion inhibition electrochemical; XPS; Adsorption mechanism
资金
- Key laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province [KLPAOSM201704]
In the present work, an attempt has been made for the development of green and high efficiency acid pickling inhibitor based on the eco-friendly polyaspartic acid (PASP). In this view, cysteamine modified PASP (PASP-S) containing S atom was prepared by ring-opening reaction of polysuccinimide with cysteamine. The corrosion inhibition performance of PASP and PASP-S for mild steel in 0.5 M H2SO4 medium were evaluated using weight loss, electrochemical impedance and potentiodynamic polarization methods. The inhibition performance of PASP-S is greatly improved with a high efficiency of 93.9% (weight loss method) at a very low concentration of 100 mg L-1 at 298 K in comparison with unmodified PASP. The obtained results also indicate that PASP-S is a mixed inhibitor and the adsorption of PASP-S on the mild steel surface follows Langmuir adsorption isotherm. Theoretical chemical parameters are calculated using the Density Functional Theory method (DFT). The excellent inhibition performance of PASP-S is due to the presence of pendent functional sulfhydryl group, which can be confirmed by X-ray photoelectron spectroscopy (XPS) analysis of the mild steel samples. The present work provides a simple and effective pathway for synthesizing high efficiency acid pickling inhibitor by introducing a functional group into the PASP chains. Such chemical modification method may also be an effective strategy to improve the efficiency of other polymer acid pickling inhibitors.
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