Effect of Roughness on Adhesion of Silane Epoxy Hybrid Resin Coating
Objective:The effect of substrate roughness on coating adhesion was studied.Method:The aluminum alloy and silane hybrid epoxy resin coating was selected as the objective of study.The relationship between adhesion coating and adhesion of substrate under different roughness was studied and the mechanism of micro-action of roughness on mechanical adhesion of coating was determined.The interface damage bonding model of silane hybrid epoxy resin coating/aluminum alloy substrate was established by finite element software and the process of coating/substrate interface from initial peeling to complete cracking was simulated.Through comparing and analyzing the relationship between the different substrate and stress of the coating,the mechanical interlock theory of the roughness on the adhesion of the coating was verified.Result:With the increase of the substrate surface roughness,the adhesion strength of the coating increases gradually,but the two do not show a linear relationship.When the thickness of the silane epoxy hybrid resin coating is(30±2)um,the surface roughness Ra=(3.6～4.8)um of the aluminum alloy substrate can ensure good adhesion of the coating.Conclusion:Uneven substrate surface can increase the contact area between the coating and the substrate,can make the coating and the substrate as firm as rivets,so as to improve the adsorption force between the coating and the substrate.
roughnesscoatingadhesive forcefinite elementsbinding modelstress valuemechanical interlock theory
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