Improving the strength of injection molded aluminum/polyphenylene sulfide lap joints dependence on surface microstructure and composition

Add time:08/12/2019    Source:sciencedirect.com

Lightweight and high-strength hybrids are of great importance for reducing material and energy consumptions. Glass fiber-reinforced polyphenylene sulfide (PPS) and aluminum (Al) alloy 6061 were joined via flexible injection molding technology. With pretreatments of anodizing and the coupling agent, the maximal lap shear strength between the polymer and metal were noticeably enhanced to 7.7 MPa, which was almost eight fold compared with the untreated case. The scanning electron microscope (SEM) and X-ray photoelectron spectrometer (XPS) investigations proved that the micro cracks with widths of nanometer scale and chemical Al-O-Si bonds were formed on the metal substrate, which contribute significantly to the interface bonding strength. According to Fourier transform infrared (FTIR) investigations, the existing C-N bonds in the coupling-agent layer on the metal surface also have a crucial effect on the bonding strength of the two dissimilar materials. The present novel methodology is much more convenient than other current commercial available technologies, and provides a promising way for the production of polymer-metal hybrids.

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