Journal
INDUSTRIAL CROPS AND PRODUCTS
Volume 178, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.indcrop.2022.114649
Keywords
Kapok leaves extracts; Green corrosion inhibitor; Electrochemical Impedance Spectra; Potentiodynamic Polarization Curves
Categories
Funding
- National Natural Science Foundation of China [51971067, 52001080]
- China Postdoctoral Science Foundation [2020M682650]
- Platform Research Capability Enhancement Project of Guangzhou University [69-620939]
- Guangzhou University's 2020 Training Program for Talent [69-62091109]
- Science and Technology Research Project of Guangzhou [202102020467]
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In this study, kapok leaves extract and iodide ions were used as environmentally-friendly corrosion inhibitors for carbon steel in sulfuric acid solution. The results showed that these inhibitors exhibited excellent inhibition performance with high efficiency even after long-term immersion.
The kapok leaves were extracted via absolute ethyl alcohol in a Soxhlet extractor. The acquired kapok leaves extract (KLE) and synergistic iodide ions are firstly used as novel environmental-friendly corrosion inhibitors for Q235 carbon steel in 0.5 mol/L H2SO4 solution. The corrosion inhibition performance was researched by electrochemical tests and surface analysis. Results indicated that the KLE and I- inhibitors exhibit a mixed anodic and cathodic inhibition behavior and outstanding inhibition efficiency of 95%. Moreover, it still achieves more than 90% inhibition efficiency after 72 h long-term immersion in sulfuric solution. The adsorption on the carbon steel surface obeys the Langmuir adsorption isotherm model involving physisorption, and the inhibition efficiency decreases with an elevated temperature. The synergistic inhibition mechanism of KLE and I- inhibitors is further revealed.
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