Fructan from Polygonatum cyrtonema Hua as an eco-friendly corrosion inhibitor for mild steel in HCl media

• Published in: Carbohydrate polymers Vol. 238; p. 116216
• Main Authors: Zhang, Weiwei, Li, Hui-Jing, Chen, Liwei, Zhang, Siyi, Ma, Yongjian, Ye, Chen, Zhou, Yuanqing, Pang, Boyi, Wu, Yan-Chao
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 15.06.2020
• Subjects: Corrosion; Corrosion inhibition; Electrochemical test; Fructan; Fructans - chemistry; Hydrochloric Acid - chemistry; Mild steel; Polygonatum - chemistry; Steel - chemistry; Surface analysis; Electrochemical test; Mild steel; Fructan; Corrosion inhibition; Surface analysis
• ISSN: 0144-8617; 1879-1344
• DOI: 10.1016/j.carbpol.2020.116216

•PF is an eco-friendly corrosion inhibitor for mild steel in HCl media.•The adsorption of PF follows the Langmuir adsorption isotherm.•PF is a mixed-type inhibitor which mainly restrained the cathodic process.•Surface morphology analysis confirmed the inhibitive character of PF. An effective and biodegradable polygonatum fructan (PF) from Polygonatum cyrtonema Hua was studied as an eco-friendly corrosion inhibitor for mild steel protection in 1 M HCl, whose inhibition performance was studied by weight loss tests, electrochemical techniques, and surface analysis techniques (SECM, FTIR). The experimental results showed that PF has outstanding inhibition performance for mild steel in hydrochloric acid, and the inhibition efficiency increased with the increase of its concentration and temperature. Polarization studies indicated that PF is a mixed-type corrosion inhibitor, and its adsorption mode conforms to Langmuir isotherm, mainly chemisorption. An adsorption-related protective inhibitor film formed on the surface of mild steel was verified and investigated based on its surface analysis and characterization. Quantum chemical analysis showed that the adsorption of PF on the surface of mild steel has obvious chemical properties.