Abstract
To investigate the influence of passivation behavior on electrochemical machining (ECM) performance, electrochemical behavior and passive film properties of S136H in neutral solutions composed of NaClO3 and NaNO3 were investigated by potentiodynamic measurements, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy, and auger electronic spectrometry. The results demonstrated that the corrosion resistance of the passive film increased with increasing NaNO3 concentration. The passive film formed in NaNO3 was more stable than that in NaClO3, which was attributed to the larger thickness, higher Fe2+/Fe3+ ratio and higher Cr2O3/Cr(OH)3 ratio of the passive film formed in NaNO3. From the ECM experimental results, the material removal rate and radial overcut area both decreased with increasing NaNO3 concentration because the area of the broken-down passive film was smaller than that in NaClO3. Additionally, a larger local corrosion area was formed on the workpiece in NaNO3 because some pores were generated in the passive film instead of the decomposition of the passive film. Therefore, compared with the NaNO3 electrolyte, using a NaClO3 electrolyte can improve the material removal rate and profile accuracy of microstructures on S136H steel.
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