アルミニウム合金とポリアミド系樹脂の接着強度に及ぼすアノード酸化皮膜の孔構造の影響

抄録

In this study, the effects of the nanoporous structure of anodic films on adhesive strength between aluminum alloys and polyamide resin were systematically investigated. To compare the anchoring effect, the alumina films with different dimensions (e.g., pore density, pore diameter and pore depth) were formed on A6063 aluminum alloys by various anodizing conditions. The adhesive strength at the interface between the adherent (anodized aluminum) and adhesive (thermoplastic elastomer resin) was evaluated by a method for determining the tensile lap-shear strength of rigid-to-rigid bonded assemblies. The higher pore density and larger pores in anodic films were important factors for improving the adhesive strength and increasing the adhesion interface area and the amount of adhesive impregnated into the pores. The adhesive strength of aluminum after anodizing in phosphoric acid at 60 V and subsequent pore widening was 17.4 MPa, which was ～3.5 times higher than that of an aluminum substrate without surface treatment.