Abstract
The effect of trace amounts of GaF3 and Ga2O3 nanoparticles on the wettability and spreadability of CsF-AlF3 flux matched Zn-15Al filler metal were comparatively studied on 6061 aluminum alloy and Q235 low-carbon steel. The experimental results indicate that appropriate amounts of GaF3 and Ga2O3 added into the flux could significantly promote the Zn-15Al filler metal to wet and spread on the surface of 6061 aluminum alloy and Q235 low-carbon steel. The optimum ranges for GaF3 and Ga2O3 were 0.0075–0.01wt.% and 0.009–0.01 wt.%, respectively. Comparative analysis showed that the activity of CsF-AlF3 flux bearing GaF3 was higher than that bearing Ga2O3. The reason for this is that the former flux has a stronger ability to remove oxides of the base metal and reduce the interfacial tension of the molten filler metal and the base metal.
Highlights
Considering their excellent physical and chemical properties as well as good mechanical processability and corrosion resistance, aluminum alloys has become the most widely used non-ferrous metal structural materials in modern industries, including appliances, construction, light industry, storage tanks, aviation, aerospace, automobile and weapons
The base metals used in this work were the 6061 aluminum alloy and the Q235 steel, and the compositions of these two materials are respectively listed in Tables 1 and 2
GaF3, the spreading area of Znmetal over Q235 steel was increased by 104% comparing to that of CsF-AlF3 flux (92 mm2 ) and by
Summary
Considering their excellent physical and chemical properties as well as good mechanical processability and corrosion resistance, aluminum alloys has become the most widely used non-ferrous metal structural materials in modern industries, including appliances, construction, light industry, storage tanks, aviation, aerospace, automobile and weapons. Low eutectic Nocolock fluxes including KF-AlF3 and CsF-AlF3 [8] are widely used to braze aluminum alloys worldwide This kind of flux has strong activity and can effectively remove the oxide film on the surface of aluminum alloy and promote the wetting and spreading of filler metal on the surface of aluminum and obtain the aluminum–aluminum brazing joint with excellent performance. With the addition of 0.5 wt.% RbF into CsF-AlF3 flux, the brazing joint of 6063 aluminum alloy and 304 stainless steel exhibits a tensile strength of up to 127 MPa. Adding 0.5 wt.% Zr [10,11] into Zn-15Al filler metal has an obvious fining effect on the η-Zn phase of the matrix. The influence of doping trace GaF3 and Ga2 O3 nanoparticles into CsF-AlF3 flux on the spreadability and wettability of Zn-15Al filler metal on the base metals was studied, and enhancement effects of these two nanoparticles on the flux activity were discussed and compared
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