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首页> 外文期刊>Cellulose >Anti-corrosion behavior of layer by layer coatings of cross-linked chitosan and poly(vinyl butyral) on carbon steel
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Anti-corrosion behavior of layer by layer coatings of cross-linked chitosan and poly(vinyl butyral) on carbon steel

机译：碳钢上交联壳聚糖和聚乙烯醇缩丁醛逐层涂层的耐腐蚀性能

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摘要

Anti-corrosion coatings of chitosan were fabricated by layer-by-layer (lbl) addition of chitosan (Ch) and poly vinyl butyral (PVB) on mild carbon steel substrate. Corrosion inhibition of chitosan in lbl coatings was analyzed by electrochemical, spectroscopic and morphological measurements. Sandwiching of chitosan between two hydrophobic PVB layers enhanced its bonding strength and enabled the amine and hydroxyl groups of chitosan to chelate with iron ions that led to the formation of a chitosan stabilized iron oxide passive layer on the metal surface. Effect of chitosan crosslinking on the stabilization process of passive oxide layer as well as the coating stability was studied by incorporating glutaraldehyde in the chitosan layer. The results obtained from electrochemical impedance spectroscopy and Tafel plots clearly showed a superior corrosion protection of lbl coatings generated by 1 % glutaraldehyde incorporation in the middle chitosan layer. SEM and Raman spectra confirmed the formation of passive oxide layer on the metal surface stabilized by chitosan polymer backbone. Improvement in the anti-corrosion properties of PVB_Ch/1 %Glu_PVB coatings were not observed after the incorporation of fillers like graphene and vermiculite in the chitosan layer probably due to the imperfect adhesion of the fillers with the polymeric matrix.
机译：通过在低碳钢基材上逐层添加壳聚糖（Ch）和聚乙烯醇缩丁醛（PVB）来制备壳聚糖的防腐涂层。通过电化学，光谱和形态学测量分析了壳聚糖在lbl涂层中的腐蚀抑制作用。将壳聚糖夹在两个疏水性PVB层之间可增强其结合强度，并使壳聚糖的胺基和羟基与铁离子螯合，从而导致在金属表面上形成壳聚糖稳定的氧化铁钝化层。通过在壳聚糖层中掺入戊二醛，研究了壳聚糖交联对钝化氧化物层稳定过程和涂层稳定性的影响。从电化学阻抗谱和Tafel图获得的结果清楚地表明，由中间壳聚糖层中1％的戊二醛掺入产生的lbl涂层具有优异的防腐蚀性能。 SEM和拉曼光谱证实由壳聚糖聚合物主链稳定的金属表面上形成了钝化氧化物层。在壳聚糖层中掺入填料（如石墨烯和ver石）后，未观察到PVB_Ch / 1％Glu_PVB涂层的防腐性能有所改善，这可能是由于填料与聚合物基体的粘合力不理想所致。

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