Materials Engineering Department, Federal University of Santa Catarina, Florianópolis, Santa Catarina 88040-900, Brazil.
Chemistry Department, Federal University of Santa Catarina, Florianópolis, Santa Catarina 88040-900, Brazil.
Carbohydr Polym. 2022 Sep 15;292:119617. doi: 10.1016/j.carbpol.2022.119617. Epub 2022 May 14.
Environmentally friendly coatings of chitosan-derivatives with natural aldehydes were investigated for corrosion protection of magnesium AZ31 alloy. The derivatives were characterized using FTIR and UV-Vis, and the swelling degree of their films was determined in 3.5 wt% NaCl solution. The coated samples were characterized using scanning electron microscopy, potentiodynamic polarization and electrochemical impedance spectroscopy. The results indicated that, as the modification degree increases, the corrosion current density and the swelling degree decrease, whereas the impedance modulus increases. For the first time it was proposed relations between |Z| and swelling with the modification degree.
用天然醛制备壳聚糖衍生物的环保涂层，研究了其对镁 AZ31 合金的腐蚀防护作用。利用傅里叶变换红外光谱和紫外-可见光谱对衍生物进行了表征，并在 3.5wt%NaCl 溶液中测定了其膜的溶胀度。采用扫描电子显微镜、动电位极化和电化学阻抗谱对涂层样品进行了表征。结果表明，随着改性程度的增加，腐蚀电流密度和溶胀度降低，而阻抗模增加。首次提出了|Z|与溶胀度和改性度之间的关系。
