Effect of electrolytic plasma polishing on microstructural evolution and tensile properties of 316L stainless steel

Ji, Gangqiang; Sun, Huanwu; Duan, Haidong; Yang, Dongliang; Sun, Jinyan

doi:10.1016/j.surfcoat.2021.127330

Cited by 14 publications

(2 citation statements)

References 36 publications

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“…Since titanium alloy is a valve metal, plasma electrolysis treatment will leave a layer of ceramic oxide film on its surface, which may affect the wettability and corrosion resistance of the surface [24,[26][27][28]. In addition, the dynamic composite energy generated during the EPPo process can affect the microstructure [29], causing changes in the surface residual stresses.…”

Section: Introductionmentioning

confidence: 99%

Effect of Electrolytic Plasma Polishing on Surface Properties of Titanium Alloy

Yang,

Sun,

et al. 2024

Coatings

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Electrolytic plasma polishing (EPPo) is an advanced metal surface finishing technology with high quality and environmental protection that has broad application prospects in the biomedical field. However, the effect of EPPo on surface properties such as corrosion resistance and the wettability of biomedical titanium alloys remains to be investigated. This paper investigated the changes in surface roughness, surface morphology, microstructure, and chemical composition of Ti6Al4V alloy by EPPo and their effects on surface corrosion resistance, wettability, and residual stress. The results showed that Ra decreased from 0.3899 to 0.0577 μm after EPPo. The surface crystallinity was improved, and the average grain size increased from 251 nm to more than 800 nm. The oxidation behavior of EPPo leads to an increase in surface oxygen content and the formation of TiO2 and Al2O3 oxide layers. EPPo can significantly improve the corrosion resistance and wettability of titanium alloy in simulated body fluid and eliminate the residual stress on the sample surface. The surface properties are enhanced not only by the reduction in surface roughness but also by the formation of a denser oxide film on the surface, changes in the microstructure, an increase in surface free energy, and the annealing effect developed during EPPo. This study can provide guidance and references for applying EPPo to biomedical titanium alloy parts.

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Section: Introductionmentioning

confidence: 99%

Effect of Electrolytic Plasma Polishing on Surface Properties of Titanium Alloy

Yang,

Sun,

et al. 2024

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“…Under the action of electrochemistry and the thermal effect of the current, a vapor gas envelope (VGE) is formed on the anode surface [17,18]. The VGE is ionized under the action of high voltage and plasma discharge medium is formed [19,20]. The anode surface is oxidized under the action of electrochemistry and plasma chemistry and the generated oxide is removed under complex physical and chemical actions, such as discharge bombardment, gas layer flow, and electrochemical dissolution [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Biological Corrosion Resistance and Osteoblast Response of 316LVM Polished Using Electrolytic Plasma

Duan

Sun

et al. 2022

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As electrolytic plasma polishing (EPP) offers the advantages of strong shape adaptability, high efficiency, and environmental friendliness, it has great application prospects in biomedical material processing. However, the effect of EPP on the biological performance of the treated surfaces remains unclear. In the present study, the effects of EPP on the surface roughness, micro-morphology, corrosion behavior, and cell response of 316LVM were investigated. The results revealed that the surface roughness (Ra) was reduced from 0.3108 to 0.0454 µm upon EPP, and the sharp peaks and protrusions produced as a result of mechanical grinding were removed. The corrosion current density decreased from 1.129 to 0.164 µA/cm2, while the charge transfer resistance increased from 513.3 to 17,430 kΩ·cm2, which implied that EPP treatment could significantly improve the corrosion resistance of 316LVM. Furthermore, affected by the sharp ridges on both sides of the groove, the outward spreading of osteoblasts (MC3T3-E1) on the untreated samples was inhibited, and the edges were curled. The cells grew along the direction of the mechanical processing texture on the untreated samples, while they grew randomly in all directions on the surface treated using EPP, which adversely affected the growth, spreading, and migration of the cells.

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