改性玄武岩/环氧涂层化学键合界面对涂层防腐性能的影响

Influence of Chemical Bonding Interface of Modified Basalt/epoxy Coating on Its Corrosion Resistance

利用硅烷偶联剂KH550对玄武岩鳞片表面进行化学改性,制备了改性玄武岩。通过红外光谱、扫描电子显微镜等技术对改性玄武岩鳞片进行表征;采用沉降实验、涂层横截面微观形貌观察分析了改性玄武岩鳞片在环氧树脂中的分散性和相容性;利用附着力测试和电化学阻抗谱技术,研究了改性玄武岩鳞片/环氧树脂复合涂层的附着性能和防腐性能。结果表明:KH550通过化学键合附着在玄武岩鳞片表面上,使玄武岩鳞片与环氧涂层形成化学键合界面,从而提高了玄武岩鳞片与环氧树脂的相容性,增强了涂层的屏蔽性能和附着力,进而提升了涂层的防腐性能。

Due to the surface smoothness and chemical inertia of basalt flakes, the interfacial bond strength of basalt flake/epoxy resin is poor. In this paper, the basalt flakes were chemically modified by silane coupling agent(KH550) to prepare the modified basalt(MB) flakes. The bare and modified basalt flakes were characterized by FT-IR and SEM/EDS. The dispersibility and compatibility of MB flakes in epoxy resin were examined by sedimentation test and cross-sectional microstructure observation of the prepared flakes/epoxy coating. The adhesion and anti-corrosion properties of MB flakes/epoxy coating were investigated using adhesion test and EIS technology, respectively. The results show that the chemical modification makes the surface of basalt flakes being chemically bonded with KH550, and which is beneficial to the formation the chemical bond interface of MB flakes/epoxy coating, leading to improve the compatibility of MB flakes with epoxy resin, therewith increase the barrier performance and adhesion of the coating, as a result, enhance the anti-corrosion performance of the modified epoxy coating.