0000000000498136

AUTHOR

J.-y. Hihn

showing 3 related works from this author

Electropolishing of CuZn brasses and 316L stainless steels: Influence of alloy composition or preparation process (ALM vs. standard method)

2016

International audience; In the present paper, electropolishing behavior of different brass alloys (CuZn39Pb2, CuZn42) in phosphoric acid is studied to observe the impact of alloying elements on polishing quality. In the same way, the influence of the manufacturing process is also evaluated through the comparison of a “standard” stainless steel and a stainless steel prepared by Additive Laser Manufacturing (ALM). An electrochemical study was first performed to determine the best treatment conditions for each material/electrolyte pair and to study the electropolishing mechanism and its kinetic dependence on diffusion. Metallic samples are fully characterized before and after electropolishing …

Materials scienceXRD020209 energyDiffusionPolishing02 engineering and technologySurface finishElectrolyteStainless steelBrasschemistry.chemical_compound0202 electrical engineering electronic engineering information engineeringMaterials Chemistry[CHIM]Chemical SciencesPhosphoric acidMetallurgySurfaces and InterfacesGeneral Chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsMicrostructureBrassRoughnessSurfaces Coatings and FilmsElectropolishingAdditive Laser Manufacturingchemistryvisual_artElectropolishingvisual_art.visual_art_medium0210 nano-technologySurface and Coatings Technology
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Power ultrasound irradiation during the alkaline etching process of the 2024 aluminium alloy

2015

Abstract Prior to any surface treatment on an aluminum alloy, a surface preparation is necessary. This commonly consists in performing an alkaline etching followed by acid deoxidizing. In this work, the use of power ultrasound irradiation during the etching step on the 2024 aluminum alloy was studied. The etching rate was estimated by weight loss, and the alkaline film formed during the etching step was characterized by glow discharge optical emission spectrometry (GDOES) and scanning electron microscope (SEM). The benefit of power ultrasound during the etching step was confirmed by pitting potential measurement in NaCl solution after a post-treatment (anodizing).

Materials scienceScanning electron microscopeAlloyGeneral Physics and Astronomychemistry.chemical_elementmacromolecular substances02 engineering and technologyengineering.material010402 general chemistry01 natural sciencesstomatognathic systemEtching (microfabrication)Aluminium[CHIM]Chemical SciencesReactive-ion etchingComputingMilieux_MISCELLANEOUSGlow dischargeAnodizingfungiMetallurgytechnology industry and agricultureSurfaces and InterfacesGeneral Chemistry021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesSurfaces Coatings and FilmschemistryengineeringDry etching0210 nano-technology
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Influence of pressure on ultrasonic cavitation activity in room temperature ionic liquids: An electrochemical study

2019

Abstract This paper provides proofs of the respective contributions of dissolved gases and solvent vapor on cavitation activity in sonoreactors. This activity can be detected by electrochemistry because the fluctuating events measured at the electrode surface are only linked to physical effects of cavitation. As ionic liquids present very low volatilities, their vaporization is reduced, and cavitation bubbles only depend on the presence of gases. Then, cavitation activity may be trigged by reactor atmosphere control. Applying severe depression within an irradiated ionic liquid medium contributes to removing dissolved gases, thus quenching cavitation activity. A specific sonoelectrochemical …

Materials scienceAcoustics and Ultrasonics02 engineering and technology010402 general chemistryElectrochemistry01 natural sciencesInorganic Chemistrychemistry.chemical_compoundVaporizationChemical Engineering (miscellaneous)Environmental ChemistryRadiology Nuclear Medicine and imagingComputingMilieux_MISCELLANEOUSQuenchingAtmospheric pressureOrganic Chemistry021001 nanoscience & nanotechnology0104 chemical sciencesSolventchemistryChemical engineeringCavitationElectrodeIonic liquid0210 nano-technology[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
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