Abstract
Technical alkaline lignin (TAL)-based composite films have been developed for anti-corrosion applications, during which one-component solvents, including acetone and ethanol, were employed. The poor solubility of TAL in the abovementioned solvents undoubtedly resulted in inhomogeneous surface micromorphology and the consequent unstable performance. The present study provides a series of ethylcellulose/TAL (EC/TAL) composite films with uniform surface microstructure by using the 1,4-dioxane/water binary solvent. EC/TAL film presents an excellent tensile stress of 26.4MPa with an elongation at break of 26.8%, which is better than those of EC film (18.4MPa and 13.3%). The addition of TAL significantly improves the thermostability of the composite films. The lignin component also contributes to the corrosion inhibition performances. In the 1mol/L HCl electrolyte, the corrosion inhibition efficiency achieves 98.8%, and these performances are all higher than 90% in 3.5wt% NaCl and 0.1mol/L KOH solutions. All these results manifest that the 1,4-dioxane/water binary solvent can be used to form TAL-containing films. The performances of as-prepared films indicate their excellent potential as an anti-corrosion coating.
Published Version
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