基体表面状态对硅烷环氧杂化树脂涂层/2024铝合金间附着力影响

目的研究不同表面状态对硅烷环氧杂化树脂涂层/2024铝合金间附着力影响规律。方法结合硅烷环氧杂化树脂涂层的综合性能与实际应用情况,选取4种常见的预处理方式来改变基体表面状态,采用拉拔测试仪测试不同基体表面状态(基体表面p H值、基体表面粗糙度、基体表面能),涂层/基体间的附着力值,研究基体表面状态对该涂层/基体间附着力的影响关系。结果基体表面状体影响涂层附着力的根本原因是基体表面能、基体表面p H值和基体表面粗糙度。结论对于硅烷环氧杂化树脂涂层,其表面处理方式可用热碱清洗方法代替传统铬酸盐钝化;当硅烷环氧杂化树脂涂层喷涂厚度为30μm时,将铝合金基体表面粗糙度控制在Ra=4.75μm左右,可保证涂层有好的附着性,附着力值为8.84 MPa。

Effect of Substrate Surface State on Adhesion of Silane Epoxy Hybrid Resin Coating/2024 Aluminium Alloy

Objective To study influencing pattern of different surface states on adhesion between silane hybrid epoxy resin coating/2024 aluminium alloy. Methods In combination with the comprehensive performance of silane hybrid epoxy resin coating and actual application, four kinds of common pretreatment ways were chosen to change the substrate surface state. The drawing tester was used to test adhesion between coating/substrate on different substrate surface states (substrate surface pH value, surface roughness of substrate, substrate surface energy), the relationship of the substrate surface state and the adhesion between coating/substrate was studied. Results The state and shape of substrate surface can affect coating adhesion and the root causes of affecting were substrate surface energy, substratesurface pH, and substrate surface roughness. Conclusion For silane hybrid epoxy resin coating, the surface treatment methods of hot alkali cleaning can substitute for traditional chromate passivation. When the silane hybrid resin coating epoxy coating thickness was 30μm, the substrate surface roughness of the aluminium alloy can be controlled as Ra=4.75μm to ensure good adhesion, and the coating adhesion value was 8.84 MPa.