Challenges and opportunities in next generation of electropolishing surfaces

In this work, a novel method of selecting the most favourable electropolishing (EP) conditions is presented as a compromise between the processing time and obtaining the lowest possible roughness value of S a or S q (commonly used parameters) as well as the gradual increase of parameters highlighted in this work S sk and S ku . The results showed that the most appropriate EP charge input should be higher than 1.2 Amin cm −2 and lower than 2.3 Amin cm −2 . XPS highresolution spectra revealed that pickling and EP of the samples results in a decrease of the ratio of the iron oxides amount (at.-%) to the total amount of chromium oxides and hydroxides (at.-%) in the passive film. This ratio gradually decreases reaching the values 1.2, 1.0 and 0.7 for asreceived, pickled and electropolished samples, respectively. This result demonstrates iron dissolution of the outer surface layer by pickling and EP.

Section: Introductionmentioning

confidence: 60%

“…The obtained results enable further study of the dynamics of the investigated phenomena, as well as provide the basic knowledge for the process control algorithms both traditional and novel EP processes such as magneto EP, usage of bipolar pulse and non-conventional electrolytes was reported by Vara et al . 13…”

Section: Introductionmentioning

confidence: 99%

Surface morphology and passive film composition after pickling and electropolishing

Lochyński

Sikora

Szczygieł

2017

“…[1][2][3][4][5][6] However, in practical application, the effects of friction and collisions on the oxide layer of the stainless steel surface result in its degradation, consequently expediting the onset of corrosion reactions. Electrochemical polishing, as a non-destructive surface treatment process, 7,8 has gained considerable attention. Specifically, electrolytic polishing facilitates the formation of a stable chromium-rich oxide film on the surface of stainless steel, thereby enhancing its corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Low current density electropolishing and corrosion resistance study of 304 stainless steel

Zhu,

Li,

Wang

et al. 2024

In response to the challenge posed by electrical breakdown occurrences during the conventional current density electrolytic polishing of large-scale stainless steel workpieces, this investigation delved into the parameters of low current density electrolytic polishing process. The study scrutinised the surface morphology and corrosion resistance of 304 stainless steel, employing tools such as metallographic microscopy, a roughness gauge, and an electrochemical workstation. Within a sulphuric acid–phosphoric acid-based electrolyte characterised by a volume ratio of 1:2, the optimal mass concentration ratio of salicylic acid and saccharin was ascertained to be 3:3. By configuring the process parameters to 10 A dm−2 and 20 min, outcomes of electrolytic polishing were obtained that stood on par with the conventional current density approach. The stainless steel surface exhibited a surface roughness measuring a mere 0.08 µm and characterised by a corrosion current density of 1.907 × 10−8 A cm−2 and a corrosion potential of −0.0965 V.

“…One of the newest applications of LP is the treatment of additively manufactured metal parts, these components have often very complex geometries so the LP, among all the surface treatments available (for instance chemical polishing [6,7], electropolishing [8][9][10][11]), seems to be the most promising one. This review paper aims to wrap together and comment on all the available findings and developments regarding the laser polishing of additively manufactured metal parts.…”

Section: Introductionmentioning

confidence: 99%

Laser polishing of additively manufactured metal parts: a review

Manco

Cozzolino

Astarita

2022

This paper provides a reliable state of the art of laser polishing process (LP), used to reduce surface roughness and to improve surface properties of additively manufactured metal parts. The motivation of this review and the introduction to the research topic are discussed in detail in the first part of the paper, then the fundamentals and the working principles of LP are exposed. A quantitative literature survey is also included, the main research streams are discussed, the most used laser sources and the most investigated materials are highlighted. The manuscript core is divided into five subchapters depending on the material to be polished: aluminium alloys, titanium alloys, steels, CoCr alloys and nickel alloys. Each of these discusses the laser adopted, the results obtained, the role of the process parameters and the physical phenomena ruling the process. The final section includes applications, advantages, direction of future work and main conclusions drawn.