Study On Composite Antimicrobial Aluminum Alloys

In this study,microstructure,mechanical properties,corrosion resistance and the antibacterial performance of Al-Mg-Si alloys with Cu,Ag composite,Zn,Ag composite,RE,Ag composite and a variety of alloy elements compound were determined by optical microscopy(OM),Vickers hardness tester,differential scanning calorimetry(DSC),universal tensile testing machine,electrochemistry workstation and antibacterium-circle test? coating film method.The results were shown as follow.With the addition of Cu,Ag composite,the grain size of Al-Mg-Si alloys were refined,the hardness and tensile strength of the alloys were improved,the precipitation of ?? phase in the alloy was promoted and the reduction of the activation energy of the ?? phase.The activation energy of ?? phase of B2 alloy(3% Cu,0.1%Ag)was 46.5 kJ/mol,which was lower than that of A alloy(only 0.1%Ag).The period of peak ageing was shortened and the peak hardness value was increased bu Cu,Ag composite.Cu,Ag composite was almost no effect on the corrosion resistance of the no-treated Al-Mg-Si alloys.Antibacterial property of Al-Mg-Si alloys was improved by the addition of Cu,Ag composite.After ageing treatment,the antibacterial rate of B1 alloy is 98.6%,and the antibacterial rate of B2 alloy is 99.5%.With the addition of Zn,Ag composite,the grain size of Al-Mg-Si alloys were refined,the hardness and tensile strength of the alloys were improved.Under the same aging conditions,the time of reaching the peak hardness of alloy was shorted with the content increasing of Zn.With the addition of Zn,Ag composite,the precipitation of the ?? phase was promoted and the reduction of the activation energy of the ?? phase,the temperature of the ?? phase precipitation was decreased.The activation energy of the ?? phase precipitation of C2 alloy(3%Zn,0.1%Ag)was 51.2 kJ/mol,which was lower than the activation energy of A alloy.Zn,Ag composite was almost no obvious effect on the corrosion resistance of the no-treated Al-Mg-Si alloys.Antibacterial property of Al-Mg-Si alloys was improved by the addition of Zn,Ag composite.After ageing treatment,the antibacterial rate of C1 alloy was 95.8%,the antibacterial rate of C2 was 97.2%.With the addition of RE,Ag composite,the grain size of Al-Mg-Si alloys were refined,the hardness and tensile strength of the alloys were improved.However,the grain size of Al-Mg-Si alloys were coarsened and the alloy properties were worsen,when the content of RE was too high.Under the same aging condition,the peak aging hardness of the alloy was improved the content increasing of RE.But the peak aging hardness will be decreased if the content of RE was too high.With the addition of RE,Ag composite,the precipitation of the ?? phase was promoted and the reduction of the activation energy of the ?? phase,the temperature of the ?? phase precipitation was decreased.The activation energy of the ?? phase precipitation of D1 alloy(0.1%RE,0.1%Ag)was 53.5 kJ/mol,which was lower than the activation energy of A alloy.But the precipitation temperature of ?? and ? phase of alloy was improved.The corrosion resistance of the no-treated alloy with RE,Ag composite was not improved,the corrosion resistance will be reduced if the content of RE was too high,the corrosion resistance of the alloy can be improved after aging treatment.Antibacterial property of Al-Mg-Si alloys was improved by the addition of RE,Ag composite.After aging treatment,the antibacterial rate of D1 alloy was about 90.8%,and the antibacterial rate of D2 alloy was about 93.4%.With the addition of the composite additive,the grain size of Al-Mg-Si alloys were refined,the hardness and tensile strength of the alloys were improved.With the addition of composite additives,the activation energy of ?? phase precipitation was 48.6 kJ/mol,which was lower than the activation energy of A alloy(EA=58.6 kJ/mol).The antibacterial property of E alloy was better,the antibacterial rate of E alloy was significantly higher than that of other alloys after aging treatment.