Lignin-Based Anticorrosion Coatings for the Protection of Aluminum Surfaces

硅烷化 材料科学 热稳定性 化学工程 涂层 木质素 正硅酸乙酯 腐蚀 表面改性 塔菲尔方程 有机化学 复合材料 电化学 化学 纳米技术 物理化学 工程类 电极
作者
Juan Carlos de Haro,Luca Magagnin,Stefano Turri,Gianmarco Griffini
出处
期刊:ACS Sustainable Chemistry & Engineering [American Chemical Society]
卷期号:7 (6): 6213-6222 被引量:63
标识
DOI:10.1021/acssuschemeng.8b06568
摘要

New renewable lignin-based coatings with anticorrosion properties are presented in this work. These materials are based on the silanization of a tetrahydrofuran (THF) soluble fraction of a technical softwood kraft lignin through urethane linkages and its subsequent thermal cross-linking on metallic substrates using different cross-linking promoters. Spectroscopy analyses confirmed silanization of lignin meanwhile the thermal analyses indicated an increase of the glass transition temperature and the thermal stability after the functionalization process. The silanized (LF-S) and nonsilanized (LF) lignins were used as main materials for the preparation of thermally cross-linked coatings in the presence of different promoters, namely tetraethyl orthosilicate (TEOS) as a cocrosslinker and/or acetic acid (AcH) as a catalyst. The coatings prepared from LF-S presented improved thermal stability and hydrophobic character compared with those obtained from unmodified LF. Moreover, the adhesion strength of the coatings on aluminum increased when the cross-linker promoters were incorporated to the coating formulation. Finally, the corrosion inhibition effect of these coatings was assessed through the evaluation of the corrosion current density on aluminum, finding important improvements on the electrochemical stability of the metal. The results of this study clearly demonstrate a straightforward approach for the production of high-lignin-content coatings that may find direct industrial application in the field of corrosion prevention for metals.
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