Chemical and Electrolytic Polishing

Gabe, D. R.

doi:10.1016/b978-0-08-052351-4.50091-1

Cited by 3 publications

(3 citation statements)

References 29 publications

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“…Mechanical polishing (MP) has some drawbacks such as surface deformation, cracking and inducing residual tension, oxide incorporation, scratch marks, and layer damage. It fails to alleviate roughness of the complex shape surface like springs, gears, or angles as well [9,10]. Microbiologists found that surface finishing treatments such as mechanical polishing, sand blasting, and grinding reduce building up of bacterial biofilm.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical polishing versus mechanical polishing of AISI 304: surface and electrochemical study

Abouelata

Attia

Youssef

2021

J Solid State Electrochem

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AISI 304 is essential for vital industries, e.g., aerospace, nuclear plants, pharmaceutical, chemical, and medical industries. Enhancement of AISI 304 surface characteristics is required for protection, durability, and better performance. Different methods were used for surface modification like mechanical polishing (MP) and electrochemical polishing (EP). Scanning electron microscopy, atomic force microscopy, and gloss values revealed the alleviation of humps, imperfection and roughness, and leveling. Smoothness and brightening of the surface after EP (∆R = − 1.206 nm) was more than that of MP treatment (∆R = − 0.562 nm). Energy dispersive X-ray analysis showed increase of Cr, Ni, and Mn content while the content of Fe decreased after EP treatment. Potentiodynamic polarization of EP AISI 304 in 3.5% NaCl revealed a high polarization resistance (R p = 2786 kΩ) and low corrosion rate of 2.74 × 10 −5 mm year −1 ). These parameters were compared to that of MP AISI 304 of lower polarization resistance (R p = 168 kΩ) and higher corrosion rate of 6.01 × 10 −5 mm year −1 ). Potentiodynamic polarization shows that the E corr was −61.09 mV for EP samples compared to −127 mV for MP samples and that the corrosion rate for MP samples was higher than that of EP samples. Mott-Schottky analysis shows a donor densities of 1.370 × 10 22 cm −3 for the EP samples vs. 3.014 × 10 21 cm −3 for MP samples, while acceptor densities of 8.304 × 10 21 cm −3 for EP samples vs. 7.389 × 10 22 cm −3 for MP samples compared to unpolished sample of donor density of 2.036 × 10 21 cm −3 and acceptor density of 8.784 × 10 20 cm −3 which evidenced the better performance for EP treatment. The results were supported by electrochemical impedance spectroscopy as well.

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Section: Introductionmentioning

confidence: 99%

Electrochemical polishing versus mechanical polishing of AISI 304: surface and electrochemical study

Abouelata

Attia

Youssef

2021

J Solid State Electrochem

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“…18 Basically, low limiting current will sacrifice the rate of the process. Stirring is regarded as an effective approach to improve the limiting current.…”

Section: Resultsmentioning

confidence: 99%

“…Electropolishing of uranium.-Electropolishing is usually achieved in the limiting current region, which is characterized by dissolution under mass transport control. 18 Basically, low limiting current will sacrifice the rate of the process. Stirring is regarded as an effective approach to improve the limiting current.…”

Section: Resultsmentioning

confidence: 99%

Fundamental Aspects of Uranium Electropolishing in AlCl₃-1-ethyl-3-Methylimidazolium Chloride Ionic Liquid

Jiang¹,

Fang²,

Luo³

et al. 2018

J. Electrochem. Soc.

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A smooth and flat uranium surface with trace of well-defined grain boundaries has been obtained by electropolishing in the Lewis acidic AlCl 3 -1-ethyl-3-methylimidazolium chloride ionic liquid. The surface roughness Ra and Ry of the uranium reduced substantially from 130.1 nm and 899.4 nm to 16.77 nm and 206.89 nm after electropolishing, respectively. The underlying mechanism of electropolishing has been investigated by the combination of electrochemical, spectroscopic and surface characterization methods. A current density plateau in the measured polarization curves of uranium is observed, which is directly related to the mass transport limit of U 3+ . The mass transport mechanism of the process follows the salt precipitation model, and the precipitate is proposed to be in the form of U(Al 2 Cl 7 ) x (AlCl 4 ) 3-x Uranium (U) has been used in military and civilian applications due to its high density and nuclear properties. Mechanical polishing is usually used to reduce the surface roughness of uranium, which could remove the mechanically damaged surface layer and determine the metallographic structure of uranium. However, typical mechanical polishing of uranium is problematic due to its radioactivity and toxicity produced by aerosol.1 Electropolishing is a more suitable method for the polishing of uranium, which could avoid the generation of aerosol. However, there are major limitations associated with the method -most notably that the extensive gas evolution with low current efficiency occurs, along with etch pits and environmental concerns.2 It is proposed that a non-aqueous solution could eliminate the above-mentioned difficulties.Ionic liquids (ILs) served as new non-aqueous solvents have been employed in the field of electropolishing.3-5 The advantage of using ILs is that high current efficiency could be obtained with negligible gas evolution at the anode/solution interface. The liquid used is comparatively benign and non-corrosive compared to the current aqueous acid solutions and bears the potential for repeated usage. Among a large variety of ILs, AlCl 3 -1-ethyl-3-methylimidazolium chloride (AlCl 3 -EMIC) is an appropriate alternative with the merits of high ionic conductivity, low viscosity and wide potential window. 6 We have previously shown that metal uranium can be oxidized to U 3+ and the corresponding products accumulated on the metal/ILs interface form a viscous layer, which could facilitate a uniform dissolution of the substrate surface. Normally, this uniform dissolution could lead to electropolishing under optimum parameters. 8 The study of mass transport mechanisms in electrodissolution systems is critical for the optimization of operating parameters. As reported, mass transport mechanisms of electrodissolution vary from mass transport limiting species. The mass transport limiting species could be the cations of the dissolving metal (salt precipitation mechanism), the anions from the electrolyte (acceptor mechanism), or the water (water mechanism). 9 The salt precipitation mechanism des...

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Polishing of additive manufactured metallic components: retrospect on existing methods and future prospects

Boban

Ahmed

Jithinraj³

et al. 2022

Int J Adv Manuf Technol

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Chemical and Electrolytic Polishing

Cited by 3 publications

References 29 publications

Electrochemical polishing versus mechanical polishing of AISI 304: surface and electrochemical study

Electrochemical polishing versus mechanical polishing of AISI 304: surface and electrochemical study

Fundamental Aspects of Uranium Electropolishing in AlCl₃-1-ethyl-3-Methylimidazolium Chloride Ionic Liquid

Polishing of additive manufactured metallic components: retrospect on existing methods and future prospects

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Chemical and Electrolytic Polishing

Cited by 3 publications

References 29 publications

Electrochemical polishing versus mechanical polishing of AISI 304: surface and electrochemical study

Electrochemical polishing versus mechanical polishing of AISI 304: surface and electrochemical study

Fundamental Aspects of Uranium Electropolishing in AlCl3-1-ethyl-3-Methylimidazolium Chloride Ionic Liquid

Polishing of additive manufactured metallic components: retrospect on existing methods and future prospects

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Fundamental Aspects of Uranium Electropolishing in AlCl₃-1-ethyl-3-Methylimidazolium Chloride Ionic Liquid