▎ 摘　　要

Graphene nano-sheets (GNSs) are considered a functional (excellent/good) material at solder alloy modification. In this study, GNSs were doped into Sn-0.7Cu solder by powder metallurgy to form Sn-0.7Cu-xGNSs (x = 0.025, 0.05, 0.075, 0.1 wt%) composite solders. The density, hardness, and electrical conductivity of the composite solders were investigated. At the same time, Potentiodynamic polarization method, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) were applied to analyze the electrochemical corrosion behavior of composite solders in the 3.5 wt% NaCl solution. The results revealed that as the content of GNSs increased, the hardness of composite solders decreased, but the density enhanced when compared with original Sn-0.7Cu. Simultaneously, the conductivity reached highest as the GNSs content was 0.025 wt%. Potentiodynamic polarization showed that GNSs affected the anodic reaction of the solders. The corrosion resistance of Sn-0.7Cu-0.075GNSs was better than that of other alloys. Sn3O(OH)(2)Cl-2 and Tin oxides were the formation of the corrosion product by XPS and XRD analysis. SEM analysis confirmed that when the GNSs content was 0.075 wt%, the corrosion products were dense and the corrosion resistance of the alloy was improved.