Preparation and corrosion resistance of short basalt fiber/7075 aluminum composite

Aiming at the problem of poor corrosion resistance of aluminum alloy drill pipe materials in an alkaline environment, an innovative short basalt fiber/aluminum composite is prepared by vacuum hot-press sintering technique. Also, the corrosion behavior of the composites is investigated by hydrogen evolution and electrochemical tests. The results show that the corrosion resistance of 7075 aluminum alloy is significantly improved after adding 1.0 wt% short basalt fiber. According to the results of scanning electron microscopy and electrochemical impedance spectroscopy, the main component of basalt fiber, SiO2, reacts with the aluminum matrix to produce a large amount of Al2O3. Meanwhile, Si atoms diffuse into the metal melt. This reaction improves the strength and density of the oxide film of the composite material, thereby improving its corrosion resistance.