▎ 摘　　要

The effect of graphene nanosheets (GNPs) on the microstructure and corrosion resistance of ADC12 alloy in HCl solution were researched by optical microscope, scanning electron microscope, energy-dispersive spectrometer, x-ray diffraction and electrochemical measurements. The microstructural evolution revealed that the addition of GNPs could significantly refine the alpha-Al, Si and beta-Al5FeSi phases, thus optimizing the microstructure of ADC12 alloy. The results of electrochemical experiments demonstrated that the corrosion current density of ADC12-0.9 wt.% GNPs alloy (1.18 mA cm(-2)) was 62.7% lower than that of the matrix (3.17 mA cm(-2)), and the corrosion potential (- 534 mV) was 8.4% higher than that of ADC12 (- 579 mV). Moreover, the value of polarization resistance (70.74 omega cm(2)) was highest when adding 0.9 wt.% GNPs, indicating the improved corrosion resistance. The results of immersion tests indicated that the corrosion rate of the ADC12-0.9 wt.% GNPs alloy (V-M = 16.31 +/- 0.81 mg cm(-2) d(-1)) was 62.3% lower than that of the matrix (V-M = 43.16 +/- 1.69 mg cm(-2) d(-1)). Moreover, the effect of GNPs on the micro-galvanic corrosion for ADC12 alloy was discussed.