Experimental measurements and thermodynamic modeling of freezing points in the systems Na+//Cl−, SO42−, NO3−–H2O and Na+, K+//Cl−, NO3−–H2O

Luo, Qinglong; Wang, Xuefeng; Huang, He; Huang, Xueli

doi:10.1016/j.fluid.2021.113203

Cited by 1 publication

(1 citation statement)

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“…In this study, the dissolution characteristics and passive film properties of SS304 and IN718 were investigated at different temperatures in 20 wt% NaNO 3 solution, which has a freezing point of around -10°C [25]. To eliminate the influence of the decrease in the solution conductivity caused by the low temperature, an ambient temperature (30°C) control group was introduced that exhibits the same conductivity as at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Low Temperature Interface Modification: Electrochemical Dissolution Mechanism of Typical Iron and Nickel Base Alloys

Lu,

Xu,

Geng

2024

J. Electrochem. Sci. Technol

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Due to its unique advantages, electrochemical machining (ECM) is playing an increasingly significant role in the manufacture of difficult-to-machine materials. Most of the current ECM research is conducted at room temperature, with studies on ECM in a cryogenic environment not having been reported to date. This study is focused on the electrochemical dissolution characteristics of typical iron and nickel base alloys in NaNO<sub>3</sub> solution at low temperature (–10°C). The polarization behaviors and passive film properties were studied by various electrochemical test methods. The results indicated that a higher voltage is required for decomposition and more pronounced pitting of their structures occurs in the passive zone in a cryogenic environment. A more in-depth study of the composition and structure of the passive films by X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy showed that the passive films of the alloys are modified at low temperature, and their capacitance characteristics are more prominent, which makes corrosion of the alloys more likely to occur uniformly. These modified passive films have a huge impact on the surface morphologies of the alloys, with non-uniform corrosion suppressed and an improvement in their surface finish, indicating that lowering the temperature improves the localization of ECM. Together with the cryogenic impact of electron energy state compression, the accuracy of ECM can be further improved.

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Section: Introductionmentioning

confidence: 99%