Abstract
Titanium matrix fiber-reinforced plastic composites had attracted increasing interest in marine and other fields because of their excellent mechanical and corrosion resistance. However, the interfacial bonding strength between the titanium matrix and the plastic is an important factor limiting its wide application. In this paper, the surface of titanium alloy TC4 (Ti-6Al-4V) was anodized to form an oxide layer with a 1–2 μm crack structure on the surface of titanium alloy. Then the titanium alloy was combined with plastic polyphenylene sulfide (PPS) by direct injection molding. The results show that different oxide layer structures on the surface of titanium alloy, which can be obtained by different anodizing times and anodizing temperatures, can obtain TC4-PPS composites with different bond strengths. The maximum bond strength of TC4-PPS composites was 16.8 MPa when the anodizing temperature was 90 °C and the oxidation time was 30 min. We also discussed the effect of titanium alloy oxide layer surface morphology, wettability, roughness, composition, failure mode, and glass fiber on the bonding strength, which is important for expanding the application of titanium alloy and plastic composite.
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