Effect of microplasma modes and electrolyte composition on micro-arc oxidation coatings on titanium for medical applications

Terleeva, O. P.; Sharkeev, Yu. P.; Slonova, A. I.; Миронов, И. В.; Легостаева, Е. В.; Хлусов, И. А.; Matykina, E.; Skeldon, P.; Thompson, G.E.

doi:10.1016/j.surfcoat.2010.10.019

Cited by 70 publications

(23 citation statements)

References 14 publications

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“…49 The plasma reactions occurred once the dielectric breakdown of the porous anodic film began (Table III Eqs. [10][11][12], thereafter the microdischarges can be observed on the θ phase (Fig. 17b).…”

Section: Discussionmentioning

confidence: 85%

Effect of the Cu Content on the Microstructure and Corrosion Behavior of PEO Coatings on Al–xCu Alloys

Zhu

Zhang

et al. 2018

J. Electrochem. Soc.

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In this study, scanning electron microscopy and electrochemical techniques were used to investigate the effect of the Cu content on the microstructure and corrosion resistance of plasma electrolytic oxidation (PEO) coatings on Al-xCu alloys. The results showed that Cu in the substrate alloy was used to promote the intensity and the transformation process of the microdischarges, which led to the undulating-ribbon feature of cross-sectional morphologies. The formation of pores and cracks in the coatings was facilitated by the oxygen release due to the oxidation of O 2− and the dissolution of copper oxide. Meanwhile, the average porosity of PEO coatings distinctly increased with the increase in the Cu content, which is the key factor causing the decreased corrosion resistance of PEO coatings. Due to their high strength to weight ratio, Cu-containing aluminum alloys are one of the most promising materials for use in aerospace and automobile applications. However, their application is limited by low corrosion resistance. Therefore, plasma electrolytic oxidation (PEO) is considered to be a well-known process for the in situ production of oxide coatings on Al and its alloys, which can offer better corrosion protection as compared to the other surface modification processes for substrate alloys. [1][2][3][4] In general, many processing factors, such as the composition of electrolyte, 5-7 additives, 8-10 applied power modes, 11-13 electrical parameters, 14,15 temperature, 16 and oxidation time, 17 are used to control the PEO process. These parameters not only affect the PEO process but also the performance of the prepared coatings. The characteristics of the formed PEO coatings could also be affected by the alloying elements in substrate alloys. However, this has not been studied in much detail. To the best of our knowledge, the literature contains several papers that describe the effect of multiple elements (such as Si, Mg, Cu, Li, and Fe) on the properties of the formed PEO coatings for commercial aluminum alloys.18-20 While, only a few studies focused on the effect of single alloying element in substrate. Among others, Ali et al. studied the PEO treatment of simple binary Al-Si alloys and reported that the thickness of PEO coatings significantly decreased, whereas their porosity increased with the increase in the Si content. The decomposition of volatile silicon oxides, such as SiO in the formed coatings during the PEO process, contributed to the high porosity. Furthermore, Si exhibits low electrical conductivity, which adversely affects the formation of microdischarges and the oxidation kinetics of the alloy. 21 Meanwhile, Oh et al. studied the effect of Mg on the properties of PEO coatings on Al-Mg alloys and demonstrated that when the amount of Mg was higher than 3 wt% the formation of α-Al 2 O 3 was inhibited.22 It is also reported that Zn is the primary alloying element for the 7××× series Al alloys, and the peculiar function of Zn during the formation of PEO coatings on binary Al-Zn alloys has also been investig...

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Section: Discussionmentioning

confidence: 85%

Effect of the Cu Content on the Microstructure and Corrosion Behavior of PEO Coatings on Al–xCu Alloys

Zhu

Zhang

et al. 2018

J. Electrochem. Soc.

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“…Titanium and its alloys are expected to be ideal materials for medical application because of their excellent characteristic such as high strength, low density (high specific strength), high immunity to corrosion and enhanced biocompatibility [5,6]. However, unlike bioactive ceramics, bio-glass, hydroxyapatite (HA) and glass ceramic, titanium implants cannot bond directly to the bone due to their poor osseointegration and osteoinductive properties [7,8]. Surface morphology, composition, hydrophilicity and roughness are key factors of implant-tissue interaction and osseointegration [9].…”

Section: Introductionmentioning

confidence: 99%

Review of the biocompatibility of micro-arc oxidation coated titanium alloys

et al. 2015

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“…These specifi c features of PEO are used, e.g., to develop ways to cover valve metals with biocompatible oxide layers with calcium phosphates [7], Zr-containing light-refl ecting layers [8], protective antifriction oxidepolymeric structures [9], Fe-containing layers with ferromagnetic properties [10,11], and layers with transition metal oxides and noble metals exhibiting a catalytic activity [12,13]. Since the beginning of systematic studies in the fi eld of PEO, ways to form functional oxide layers on metals and alloys of nonvalve type (iron, steel, cast iron, nickel, lead, zinc, copper, etc.)…”

mentioning

confidence: 99%

Combination of plasma-electrolytic oxidation and extraction-pyrolytic method for formation of metal oxide layers

et al. 2012

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Elemental composition and morphology of oxide coatings formed on stainless steel, nickel alloy (nonvalve metals), and titanium (valve metal) by plasma-electrolytic method combined with the extraction-pyrolytic technique are reported. It is shown that combination of these methods is promising for obtaining oxide coatings with a complex chemical composition and various physicochemical properties.One of modern ways to form functional oxide layers on metals and alloys is by plasma-electrolytic oxidation (PEO), i.e., anodic or anodic-cathodic oxidation of the surface of metals and alloys in aqueous electrolytes at spark or arc electric-discharge voltages [1,2]. This method is employed to form wear-and corrosionresistant oxide layers on products made of aluminum, titanium, magnesium, and their alloys. These are metals and alloys of the valve group, on whose surface a barrier oxide fi lm is formed at the initial instants of time before the spark (conventional) anodization. This fi lm has high electrical resistance and leads to development of spark breakdowns upon an increase in voltage.In electrolytes of certain composition, commonly of aqueous type, electric discharges initiate high-rate growth of an anodic oxide layer on the surface of valve metals, with this layer containing high-temperature oxide phases, e.g., γ-and α-Al 2 O 3 on aluminum [3,4]. This circumstance is widely used in practice to form wear-resistant layers on articles made of aluminum and its alloys [1,2].At the same time, processes caused by electric discharges can produce coatings containing electrolyte components [5], including solid dispersed particles [6]. These specifi c features of PEO are used, e.g., to develop ways to cover valve metals with biocompatible oxide layers with calcium phosphates [7], Zr-containing light-refl ecting layers [8], protective antifriction oxidepolymeric structures [9], Fe-containing layers with ferromagnetic properties [10,11], and layers with transition metal oxides and noble metals exhibiting a catalytic activity [12,13]. Since the beginning of systematic studies in the fi eld of PEO, ways to form functional oxide layers on metals and alloys of nonvalve type (iron, steel, cast iron, nickel, lead, zinc, copper, etc.) have been under development. No passive oxide layers with a valve (diode) effect are formed in anodic polarization on the surface of metals of this kind [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].The already developed, or being discussed in the literature, approaches to coating formation by PEO on metals and alloys of the nonvalve group can be conditionally divided into three groups. In the fi rst of these, a layer of a valve metal, commonly aluminum or its alloys, with a certain thickness is preliminarily deposited on the surface and then processes into an oxide RUSSIAN JOURNAL OF APPLIED CHEMISTRY Vol. 85 No. 4 2012 622 RUDNEV et al.coating by PEO. An aluminum layer is deposited, e.g., by electric arc metallization [20,21] in aluminum-plating baths [23]. In the second group, high curre...

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Effect of microplasma modes and electrolyte composition on micro-arc oxidation coatings on titanium for medical applications

Cited by 70 publications

References 14 publications

Effect of the Cu Content on the Microstructure and Corrosion Behavior of PEO Coatings on Al–xCu Alloys

Effect of the Cu Content on the Microstructure and Corrosion Behavior of PEO Coatings on Al–xCu Alloys

Review of the biocompatibility of micro-arc oxidation coated titanium alloys

Combination of plasma-electrolytic oxidation and extraction-pyrolytic method for formation of metal oxide layers

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