On discrepancies between theory and practice of electropolishing

Hryniewicz, Tadeusz

doi:10.1016/0254-0584(86)90119-7

Cited by 9 publications

(7 citation statements)

References 11 publications

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“…In view of displaying its advantages and features, extensive investigations over the MEP process were carried out . Meanwhile, the studies on the theory of electropolishing were also continued [2,8,36]. Results of the studies have proved that the MEP process is characteristic with many meaningful features, prevailing over a standard electropolishing EP, starting from diminished surface roughness [10][11][12]14,15,17,20,24,30,43,45], more advantageous surface film composition [14][15][16][17][18]26,29,[32][33][34]38,40,41,43,[45][46][47][48][49][50][51],increased nanohardness [34,[38][39][40]43,46,47], through the increased corrosion resistance [12][13][14][15][17]…”

Section: Progress In Electropolishingmentioning

confidence: 99%

“…The process of electropolishing (EP) has been developed for many decades now in view of obtaining shiny, bright and glossy surface on metals and alloys [1][2][3][4][5]. Some characteristic features of machine parts are usually obtained after EP [4][5][6][7] due to removal of surface roughness and formation of passive surface film on them, including possible changes in color [6].…”

Section: Introductionmentioning

confidence: 99%

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Electropolishing Processes for Better Implants’ Performance

Hryniewicz¹

2018

BJSTR

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In the paper, a review of electropolishing processes is presented, beginning from a standard electropolishing (EP), through high-current-density electropolishing (HDEP, and high-voltage electropolshing (HVEP), being a commence of a new plasma electrolytic oxidation (PEO) process performed in concentrated 85% phosphoric acid (H3PO4). This work provides a several-decade history of developing the electropolishing processes, starting from simple surface finishing for obtaining roughness-free, bright and glossy metal surface, through a considerable progress in surface engineering in view of getting real advantages while applying it in medicine for biomedical parts, devices and implants. This review reveals how a big step was done by introducing the magnetic field into the process, with the name of magnetoelectropolishing (MEP). The most important features of MEPtreated metal/alloy parts is a big increase in corrosion resistance, substantial decrease of hydrogenation, huge increase in mechanical and fatigue resistance in cyclic bending, up to much better surface hydrofilicity, with improved biocompatibility.

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Section: Progress In Electropolishingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electropolishing Processes for Better Implants’ Performance

Hryniewicz¹

2018

BJSTR

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“…Surface modification of metals and alloys may be carried out by electrochemical polishing [1][2][3][4][5][6][7][8][9], magnetoelectropolishing [10][11][12][13][14] and electropolishing with high-current densities [15][16][17], as well as by chemical and electrochemical machining treatment [18][19][20][21][22][23][24][25]. Other ways of modifying the surface are ion implantation [26][27][28][29][30][31], electrophoretic deposition [32], and laser surface treatment [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Phosphate Porous Coatings Enriched with Selected Elements via PEO Treatment on Titanium and Its Alloys: A Review

2020

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This paper shows that the subject of porous coatings fabrication by Plasma Electrolytic Oxidation (PEO), known also as Micro Arc Oxidation (MAO), is still current, inter alia because metals and alloys, which can be treated by the PEO method, for example, titanium, niobium, tantalum and their alloys, are increasingly available for sale. On the international market, apart from scientific works/activity developed at universities, scientific research on the PEO coatings is also underway in companies such as Keronite (Great Britain), Magoxid-Coat (Germany), Mofratech (France), Machaon (Russia), as well as CeraFuse, Tagnite, Microplasmic (USA). In addition, it should be noted that the development of the space industry and implantology will force the production of trouble-free micro- and macro-machines with very high durability. Another aspect in favor of this technique is the rate of part treatment, which does not exceed several dozen minutes, and usually only lasts a few minutes. Another advantage is functionalization of fabricated surface through thermal or hydrothermal modification of fabricated coatings, or other methods (Physical vapor deposition (PVD), chemical vapor deposition (CVD), sol-gel), including also reoxidation by PEO treatment in another electrolyte. In the following chapters, coatings obtained both in aqueous solutions and electrolytes based on orthophosphoric acid will be presented; therein, dependent on the PEO treatment and the electrolyte used, they are characterized by different properties associated with their subsequent use. The possibilities for using coatings produced by means of plasma electrolytic oxidation are very wide, beginning from various types of catalysts, gas sensors, to biocompatible and antibacterial coatings, as well as hard wear coatings used in machine parts, among others, used in the aviation and aerospace industries.

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“…Besides, the new electrolytes have been developed to electropolishing of titanium, tantalum, and cobalt alloys [1][2][3][4], niobium [42][43][44]. The new theory "enhanced oxidation-dissolution theory" was proposed to amend the most recognized Hoar theory of electropolishing [35,[52][53][54]. To develop our experiments carried out at high current density and high-rate electrochemical conditions under increased temperatures, the new reference electrode was applied with the characteristics presented in Fig.…”

Section: Electrochemical Systemsmentioning

confidence: 99%

Magnetic Fields for Electropolishing Improvement: Materials and Systems

Hryniewicz

Rokosz

Rokicki³

2013

ILCPA

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The paper aims to present the main objectives for using magnetic fields to improve process of electropolishing (EP), firstly by focusing on materials and electrochemical systems. The general introduction has been concerned on the sample surface treated under pseudopassivity conditions, in the process generally known as magnetoelectropolishing (MEP). Long-term up-to-date experiments have shown profound changes observed on metals and alloys. The advantageous effects gained by applying MEP to metals and alloys cover: improvement of corrosion resistance, bio-and haemocompatibility, roughness by modification of their surfaces. The improvements are also referred to the mechanical properties of metals and alloys treated by MEP namely: removal of hydrogen, fatigue resistance enhancement, etc. Further developments and the effects of magnetic fields on electropolishing of metals and alloys are to be presented in the next publications.

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On discrepancies between theory and practice of electropolishing

Cited by 9 publications

References 11 publications

Electropolishing Processes for Better Implants’ Performance

Electropolishing Processes for Better Implants’ Performance

Phosphate Porous Coatings Enriched with Selected Elements via PEO Treatment on Titanium and Its Alloys: A Review

Magnetic Fields for Electropolishing Improvement: Materials and Systems

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