Study on Synergistic Effect of La₂O₃ Nanoparticles and Silane in Copper Alloy Surface Treatment Solution

In order to improve the corrosion resistance of the copper alloy surface, the synergistic effect of La2O3 nanoparticles and silane was studied. The formula of the basic silane treatment solution containing silane (PropS-SH) was obtained by orthogonal experiment, and the surface morphology and structure of the copper alloy after treatment were analyzed by scanning electron microscope (SEM) and X-ray diffraction (XRD). Moreover, the effects of La2O3 nanoparticles and silane on the surface properties of copper alloys were analyzed by electrochemical testing methods such as AC impedance. Results showed that the addition of La2O3 nanoparticles and silane enabled the formation of a dense and uniform La/silane composite film on the surface of the copper alloy specimens, which improved the corrosion resistance of the copper alloy. That is to say, La2O3 nanoparticles and silane possessed a synergistic effect on the corrosion resistance of the copper alloy, and the effect was better than traditional BTA passivation effect.