Corrosion resistance of Pb-Sn composite coatings reinforced by carbon nanotubes

摘要

Carbon nanotubes/Pb-Sn composite coatings were prepared by electrodeposition technology. The polarization curves and electrochemical impedance of the Pb-Sn coatings and carbon nanotube/Pb-Sn composite coatings were studied in 3.0 wt% HC1, 10 wt% NaOH, and 3.5 wt% NaCl electrolyte solutions, respectively. The results show that the corrosion potential of carbon nanotubes/Pb-Sn composite coatings were improved in the three kinds of corrosive medium, especially in 3.5 wt% NaCl electrolyte solution, where it increased significantly from -0.592 V (vs SCE) to -0.535 V (vs SCE). In addition, composite coatings have higher electrochemical impedance. Carbon nanotubes can improve the corrosion resistance of lead-tin electroplated coatings.