Abstract
The effects of ultrasonic-aided quenching (USQ) on the microstructure and corrosion properties of 35CrMoV steel in a simulated seawater environment (wt % (NaCl) = 3.5) were studied. The corrosion properties of the steel were studied by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. The scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to characterize the microstructure and corrosion products. Combined with the EIS equivalent circuit, the corrosion mechanism was investigated. The results show that the microstructure of the USQ specimen is small martensite and that there was no residual ferrite compared with an un-ultrasonic-aided quenching (UUSQ) sample. It was also found that the corrosion products of USQ sample are less than the UUSQ sample, and the corrosion cracks are lighter and thinner than that of the UUSQ sample, which indicates that the corrosion resistance of 35CrMoV in a seawater environment has been obviously improved.
Highlights
With the development of science and technology, developing and utilizing marine resources has become an integral part of the national economy, and people have gained much more interest in the use of the ocean than before
The corrosion surfaces of the samples were rinsed with deionized water and ethanol solution spectroscopy (EIS) measurements were carried out after 2400 s, at the open circuit potentials, with and athen dried in an air stream
Microstructure specimens wanted to cool from the complete austenite temperature to room temperature without high-temperature transformation, quenching medium must have a quite higher quenching intensity
Summary
With the development of science and technology, developing and utilizing marine resources has become an integral part of the national economy, and people have gained much more interest in the use of the ocean than before. Only a small part of the recent studies have paid attention to the corrosion behavior of steels. Its price is improved far lower than chromium–nickel steel with the same that and the corrosion can be markedly by the ultrasonic peening [11]. Mid-carbon steel, the purpose of this paperof was to investigate thehigh effects of ultrasonic quenching on thelimit, which is widely used in the exploration oceans due to its static strength, high fatigue corrosion behavior of. Its price is far lower than the chromium–nickel steel with quenching process of 35CrMoV steel in the seawater environment. Methodsof this paper was to investigate the effects of ultrasonic quenching on the corrosion behavior of 35CrMoV steel in the marine environment.
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