Abstract
The effects of ultrasonic vibrations during quenching on the corrosion resistance of 35CrMoV steel in acidic, neutral and alkaline mediums with the same Cl− concentration were investigated by electrochemical and immersion tests. The microstructure and corrosion surfaces of specimens were obtained by scanning electron microscope (SEM). The SEM results show that the microstructure of the ultrasonic-aided quenching (USQ) specimen is small martensite, and no residual ferrite compared to the un-ultrasonic-aided quenching (UUSQ) specimen. And the corrosion cracks are lighter and less than that of the UUSQ specimen. It was also found that in the immersion and electrochemical impedance spectroscopy (EIS) tests, the corrosion resistance of the specimens decreased with the decrease of the pH value of mediums, and the corrosion resistance of 35CrMoV steel can be significantly improved by USQ.
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