Investigation of electrode distance impact on PEO coating formation assisted by simulation

Zhang, Fujun; Blawert, Carsten; Höche, Daniel; Zheludkevich, Mikhail L.; Kainer, Karl Ulrich

doi:10.1016/j.apsusc.2016.01.030

Cited by 26 publications

(17 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… Sketch of the PEO experimental setup with stainless steel as a cathode and AM50 alloy as anode. Reproduced with permission from [ 151 ]. Copyright Elsevier, 2016.…”

Section: Figurementioning

confidence: 99%

“…Apart from these factors, physical factors such as the distance between electrodes have been found to play an important role in spark discharges. Ma et al [ 151 ] carried out a PEO experiment on AM50 Mg alloys in an alkaline electrolyte having various electrode gap distances and uniform electric voltages. The setup of the experiment is shown in Figure 18 below:…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Plasma Electrolytic Oxidation (PEO) Process—Processing, Properties, and Applications

et al. 2021

View full text Add to dashboard Cite

Plasma electrolytic oxidation (PEO) is a novel surface treatment process to produce thick, dense metal oxide coatings, especially on light metals, primarily to improve their wear and corrosion resistance. The coating manufactured from the PEO process is relatively superior to normal anodic oxidation. It is widely employed in the fields of mechanical, petrochemical, and biomedical industries, to name a few. Several investigations have been carried out to study the coating performance developed through the PEO process in the past. This review attempts to summarize and explain some of the fundamental aspects of the PEO process, mechanism of coating formation, the processing conditions that impact the process, the main characteristics of the process, the microstructures evolved in the coating, the mechanical and tribological properties of the coating, and the influence of environmental conditions on the coating process. Recently, the PEO process has also been employed to produce nanocomposite coatings by incorporating nanoparticles in the electrolyte. This review also narrates some of the recent developments in the field of nanocomposite coatings with examples and their applications. Additionally, some of the applications of the PEO coatings have been demonstrated. Moreover, the significance of the PEO process, its current trends, and its scope of future work are highlighted.

show abstract

“… Sketch of the PEO experimental setup with stainless steel as a cathode and AM50 alloy as anode. Reproduced with permission from [ 151 ]. Copyright Elsevier, 2016.…”

Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plasma Electrolytic Oxidation (PEO) Process—Processing, Properties, and Applications

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The work of Kazanski [20] and Moon [21] suggests that the addition of fluoride into the electrolyte suppresses the formation of a defect-rich zone between the substrate and the PEO layer, which is described by several authors for the PEO of Mg materials over a wide parameter range [11,[20][21][22][23][24]. [25,26] (left) and magnesium materials within fluoride-free electrolyte [23,24] (right).…”

Section: Electrolyte Constituentsmentioning

confidence: 91%

“…The appearance of this zone, referred to by Lu and Ma as the pore band [23,24], inevitably has a limiting effect on the technological layer properties such as wear and corrosion resistance and substrate adhesion.…”

Section: Electrolyte Constituentsmentioning

confidence: 99%

Characterisation Method of the Passivation Mechanisms during the pre-discharge Stage of Plasma Electrolytic Oxidation Indicating the Mode of Action of Fluorides in PEO of Magnesium

et al. 2020

View full text Add to dashboard Cite

Plasma electrolytic oxidation (PEO) is a method to obtain protective coatings on metallic light-weight construction materials. Here, the workpiece receives a strong anodic polarisation in a suitable aqueous electrolyte, which leads to the formation of a passive layer and a gaseous shell. Afterwards, plasma electrolytic discharges appear on the substrate surface and convert it into a ceramic layer. The properties of the passive layer are influenced by the selected substrate/electrolyte combination and are essential for the PEO process-initiation and characteristics. In this work, a new method for the systematic investigation of the substrate/electrolyte interactions during the pre-discharge stage is presented. The procedure is carried out by a polarisation experiment and allows for a quantitative characterisation of the passivation behavior, based on a small electrolyte volume. The method is used to investigate a literature-known electrical conduction mechanism on passive films formed on magnesium, by cross-comparison between different Mg and Al materials. In addition, the influence of phosphate, glycerol, and fluoride on the passivation behaviour of the Mg alloy AZ31 in an alkaline environment is considered and quantified. The results provide an explanatory approach for the positive influence of toxic fluorides within the electrolyte on the morphology of PEO layers on magnesium.

show abstract

“…The formation of these intense discharging makes Ph and Si coatings highly porous in the thickness (Table 2), especially Ph coating (7.25%). Ma et al [39] secluded phosphate type coatings from conventional dual-layered PEO coatings and determined three sub-layers, counting the pores as a separate midlayer and the upper section with penetrated channels as the outer layer. The thickness of prepared PEO coatings was also measured using cross-sectional observations.…”

Section: Surface Morphology and Cross-sectional Observationsmentioning

confidence: 99%

The Effect of Electrolytic Solution Composition on the Structure, Corrosion, and Wear Resistance of PEO Coatings on AZ31 Magnesium Alloy

et al. 2020

View full text Add to dashboard Cite

Plasma electrolytic oxidation coatings were prepared in aluminate, phosphate, and silicate-based electrolytic solutions using a soft-sparking regime in a multi-frequency stepped process to compare the structure, corrosion, and wear characteristics of the obtained coatings on AZ31 magnesium alloy. The XRD results indicated that all coatings consist of MgO and MgF2, while specific products such as Mg2SiO4, MgSiO3, Mg2P2O7, and MgAl2O4 were also present in specimens based on the selected solution. Surface morphology of the obtained coatings was strongly affected by the electrolyte composition. Aluminate-containing coating showed volcano-like, nodular particles and craters distributed over the surface. Phosphate-containing coating presented a sintering-crater structure, with non-uniform distributions of micro-pores and micro-cracks. Silicate-containing coating exhibited a scaffold surface involving a network of numerous micro-pores and oxide granules. The aluminate-treated sample offered the highest corrosion resistance and the minimum wear rate (5 × 10−5 mm3 N−1 m−1), owing to its compact structure containing solely 1.75% relative porosity, which is the lowest value in comparison with other samples. The silicate-treated sample was degraded faster in long-term corrosion and wear tests due to its porous structure, and with more delay in the phosphate-containing coating due to its larger thickness (30 µm).

show abstract

Investigation of electrode distance impact on PEO coating formation assisted by simulation

Cited by 26 publications

References 35 publications

Plasma Electrolytic Oxidation (PEO) Process—Processing, Properties, and Applications

Plasma Electrolytic Oxidation (PEO) Process—Processing, Properties, and Applications

Characterisation Method of the Passivation Mechanisms during the pre-discharge Stage of Plasma Electrolytic Oxidation Indicating the Mode of Action of Fluorides in PEO of Magnesium

The Effect of Electrolytic Solution Composition on the Structure, Corrosion, and Wear Resistance of PEO Coatings on AZ31 Magnesium Alloy

Contact Info

Product

Resources

About