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Adhesive bonding between Mg alloys and polypropylene

Abstract A study on the adhesive joining of magnesium alloys and polypropylene (PP) sheets is reported. Satisfactory bonding was achieved only after a suitable chemical surface pretreatment of both PP and magnesium surfaces. The adhesive strength of the PP/adhesive interface significantly increased after treatment, as a result of an increase in surface area. The SEM images of the failed joint after peel tests showed that the peeling region appeared to have a little PP on it. The average tensile shear strength was 16˙58 MPa. The effect of mixing 1 wt-%SiO2 particles into the adhesive was also tested. Tensile shear tests on SiO2 doped specimens revealed that the adhesive strength of the adhesive was higher than that of the base metal. Analysis of the adhesion mechanism led to a conclusion that bonding between PP and the adhesive layer interface is by diffusion and mechanical interaction, whereas bonding between the magnesium and adhesive is mainly the result of coordinative bond forces.