Abstract
The excellent strength, toughness, and corrosion resistance of high-strength stainless steel has led to its extensive use in the chemical, nuclear, aerospace, and aviation industries. To shape this hard-to-cut material, electrochemical machining is a promising process. However, few reports have focused on the electrochemical dissolution behavior of high-strength stainless steel. Therefore, we focus herein on the electrochemical dissolution behavior of S-04 high-strength stainless steel in NaNO3 aqueous solution. The current efficiency indicates that current density can be divided into three regions (I, II, and III). Interestingly, a black machined surface appears in regions II and III, and the machined surface is shiny for region III. X-ray photoelectron spectroscopy indicates that the black machined surface is mainly due to the presence of Fe3O4. In addition, γ-Fe2O3 was also detected on the black machined surface in region III, whereas both γ-Fe2O3 and α-Fe2O3 were also detected on the black machined surface in regions I and II. Moreover, dissolution morphologies examined by SEM/EDX at different current densities and machining times showed that a good surface finish of the S-04 specimen can be obtained in region III. Finally, grooves with black surfaces in regions II and III were obtained by electrochemical milling.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (Grant No. 2018YFB1105900), National Natural Science Foundation of China for Creative Research Groups (Grant No. 51921003) and “333 Engineering” of Jiangsu Province (Grant No. BRA2018035).
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Wang, M., Qu, N. Electrochemical dissolution behavior of S-04 high-strength stainless steel in NaNO3 aqueous solution. J Appl Electrochem 50, 1149–1163 (2020). https://doi.org/10.1007/s10800-020-01469-2
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DOI: https://doi.org/10.1007/s10800-020-01469-2