Functionalization of aluminum alloy surface with reactive epoxide silane to induce ultra-high strength polyamide 6 / aluminum alloy composite joint

[Display omitted] •The bonding strength of the PA6/GF-Al joint was promoted to 37.8 MPa by the silane.•Even at 90 °C, the bonding strength of PA6/GF-Al joint was about 60 % of that at 20 °C.•After annealing, the bonding strength of the PA6/GF-Al joint was improved by 23.2% It is of great practical i...

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Veröffentlicht in:Applied surface science 2023-07, Vol.626, p.157231, Article 157231
Hauptverfasser: Wang, Bowen, Li, Xiping, Hu, Zhonglue, Wang, Sisi, Dong, Weiping, Wang, Bin, Wang, Linlin, Gong, Ningning
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Sprache:eng
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Zusammenfassung:[Display omitted] •The bonding strength of the PA6/GF-Al joint was promoted to 37.8 MPa by the silane.•Even at 90 °C, the bonding strength of PA6/GF-Al joint was about 60 % of that at 20 °C.•After annealing, the bonding strength of the PA6/GF-Al joint was improved by 23.2% It is of great practical importance to efficiently prepare lightweight and high-strength polymer-metal composite joints for energy conservation and pollution reduction. In this study, the ultra-high strength polyamide 6 (PA6)-aluminum alloy (Al) composite joints were rapidly prepared by injection molding, where the Al surface was treated by the sandblasting and the reactive epoxide silane (γ-(2,3-epoxypropoxy) propytrimethoxysilane, denoted as γ-epoxysilane). This study showed that the bonding strength of the composite joints could be increased by 182 % to 37.8 MPa when the Al surface was treated with 10 wt% γ-epoxysilane. Such excellent performance was retainable at elevated temperatures, still reaching 22.5 MPa at 90 °C, which is about 60 % of that at room temperature. Annealing treatment can further elevate the bonding strength to 46.6 MPa, which is among the highest for PA6-Al composite joints. Reactive silane-induced functionalization of the Al surface and failure mechanism of the composite joint was confirmed by X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). This study demonstrates a facile method to prepare ultra-high strength PA6-Al composite joints, which can hopefully spur new ideas for the development of lightweight engineering components in the future.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2023.157231