Abstract
We introduce a cost-effective method that combines electroplating with metal cold working processes to manufacture composite tubes with robust corrosion resistance. First, a 3-step electroplating process was developed to form an adhesive and uniform Ag coating on the outer wall of a 304 stainless steel tube. The process consisted of a Ni-strike step for removing the passivation layer of the initial 304 tube, Cu deposition for smoothing the surface by adding a buffer layer, and Ag deposition. To reinforce the interfacial adhesion between the electroplated layers and the 304 tube and increase the area of the Ag coating, a pilger rolling or pilger rolling + heat-treatment process was performed after the Ag electroplating process. Scanning electron microscopy of the composite tubes after each process indicated that the as-deposited Ag coating changed from having a rough to smooth surface after only pilger rolling and with additional heat treatment. Electron backscatter diffraction analysis of the microstructures and textures of the tubes revealed that dynamic recrystallization occurred extensively during pilger rolling, resulting in the formation of a relatively defect-free grain structure without heat treatment. Furthermore, electrochemical polarization curves determined that the Ag-coated composite tubes are superior to the uncoated 304 tube in terms of corrosion resistance under Cl− atmosphere, owing to the formation of a AgCl passivation layer during testing. Surface analysis of the composite tubes suggests that the properties of the AgCl passivation layer are related to the grain size of the Ag coating and the density of plastic-deformation-induced defects.
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This research was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2016R1D1A1B02015781).
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Park, H., Lee, WJ., Son, JH. et al. Effects of Pilger Rolling and Heat Treatment on Microstructure and Corrosion Resistance of Ag-Electroplated 304 Stainless Steel Tubes. Met. Mater. Int. 28, 1881–1889 (2022). https://doi.org/10.1007/s12540-021-01089-1
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DOI: https://doi.org/10.1007/s12540-021-01089-1