Corrosion resistance, mechanical properties and biocompatibility of Hf-containing ZrCN coatings

Cotruț, Cosmin Mihai; Braic, V.; Bâlâceanu, M.; Titorencu, Irina; Braic, M.; Parau, Anca Constantina

doi:10.1016/j.tsf.2012.12.100

Cited by 30 publications

(21 citation statements)

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“…As the electrolyte penetrates the films throughout the pores, two scenarios can be foreseen, depending on the nature of the films: (i) The electrolyte does not react with the film and penetrates to the substrate or (ii) The electrolyte reacts with the coating, passivating the surface and blocking the pores with the corrosion products [20]. Electrochemical porosity is usually calculated by comparing the polarization resistance of the bare substrate and that of the coated substrate [10,11,27,[62][63][64][65][66], making use of the empirical equation deduced by Elsener et al [67] (see Equation (1)):…”

Section: Influence Of Poresmentioning

confidence: 99%

“…In fact, even in substrates with generalized corrosion, the films seem to induce pitting corrosion [3]. Then, it is possible to control the defects and the morphology of the coatings to avoid the formation of pits, which is one of the challenges encountered when designing magnetron-sputtered films with corrosion-resistant properties.Among the most reported application of MeN, MeCN, and C-based films, which require anticorrosion properties there are: the enhancement of mechanical steel parts [3,4], the improvement of magnesium alloys [5,6] and aluminum alloys [7], the protection of magnetic materials [8,9], and the improvement of biomedical devices [3,[10][11][12][13], with the the last one being one of the key applications for the analysis of electrochemical performance. A detailed summary of some of the electrochemical studies developed on coatings deposited by magnetron sputtering, which emphasize the substrate, type of coating, electrolyte, and tests utilized, can be found in the Supplementary Information (Table S1).…”

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confidence: 99%

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Electrochemical Corrosion of Nano-Structured Magnetron-Sputtered Coatings

et al. 2019

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Magnetron sputtering has been employed for several decades to produce protective and multi-functional coatings, thanks to its versatility and ability to achieve homogeneous layers. Moreover, it is suitable for depositing coatings with very high melting points and that are thermodynamical unstable, which is difficult to accomplish by other techniques. Among these types of coating, transition metal (Me) carbides/nitrides (MeC/N) and amorphous carbon (a-C) films are particularly interesting because of the possibility of tailoring their properties by selecting the correct amount of phase fractions, varying from pure MeN, MeC, MeCN to pure a-C phases. This complex phase mixture can be even enhanced by adding a fourth element such Ag, Pt, W, Ti, Si, etc., allowing the production of materials with a large diversity of properties. The mixture of phases, resulting from the immiscibility of phases, allows increasing the number of applications, since each phase can contribute with a specific property such as hardness, self-lubrication, antibacterial ability, to create a multifunctional material. However, the existence of different phases, their fractions variation, the type of transition metal and/or alloying element, can drastically alter the global electrochemical behaviour of these films, with a strong impact on their stability. Consequently, it is imperative to understand how the main features intrinsic to the production process, as well as induced by Me and/or the alloying element, influence the characteristics and properties of the coatings and how these affect their electrochemical behaviour. Therefore, this review will focus on the fundamental aspects of the electrochemical behaviour of magnetron-sputtered films as well as of the substrate/film assembly. Special emphasis will be given to the influence of simulated body fluids on the electrochemical behaviour of coatings.

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Section: Influence Of Poresmentioning

confidence: 99%

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confidence: 99%

Electrochemical Corrosion of Nano-Structured Magnetron-Sputtered Coatings

et al. 2019

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“…Among the large refractory metal carbonitrides, ZrCN is an attractive material because of its excellent chemical and physical properties, such as relatively low electrical resistivity and high corrosion resistance [16]. For instance, Cotrut et al [17] reported that ZrC 1Àx N x deposited by magnetron sputtering could both improve the corrosion resistance and reduce the friction coefficient of Tie6Ale4V. To the best of our knowledge, there have been no reports available in the literature with regard to the use of ZrCN coatings for metallic bipolar plates.…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of a ZrCN coated Ti alloy with potential application as a bipolar plate for proton exchange membrane fuel cell

Huang

et al. 2016

Journal of Alloys and Compounds

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a b s t r a c tTo improve the corrosion resistance, surface electrical conductivity and wettability of Tie6Ale4V used in polymer electrolyte membrane fuel cell (PEMFC), a ZrCN nanocrystalline coating was deposited on Ti e6Ale4V substrate using double cathode glow discharge technique. The new coating exhibited a nanocomposite structure, consisting of amorphous C, CN x and nanocrystalline ZrCN. The effect of the HF concentrations on the corrosion behavior of the coating was investigated by potentiodynamic, potentiostatic polarizations and electrochemical impedance spectroscopy (EIS) in a simulated the operating conditions of a PEMFC. With increasing HF concentrations, the corrosion potential (E corr ) decreased and the corrosion current density (i corr ) of the ZrCN coating increased, indicating that corrosion resistance decreased with the increase of HF concentrations. However, at any given concentration of HF, the corrosion resistance of the ZrCN coating was significantly higher than that of uncoated Tie6Ale4V. The results of EIS measurements showed that with increasing the concentration of HF, the resistance of the passive film (R b ) formed on the ZrCN coating decreased slightly, being of the order of magnitude of 10 7 U cm 2 , which was an improvement by four orders of magnitude compared to uncoated Ti-6A1-4V. At a compaction force of 140 N cm À2 , no perceptible difference in the interfacial contact resistance (ICR)of ZrCN-coated Ti-6A1-4V was observed before and after potentiostatic polarization for 120 min, and its ICR values were reduced by one order of magnitude in comparison to that of uncoated Ti-6A1-4V. Moreover, ZrCN-coated Ti-6A1-4V exhibited a much low surface wettability than uncoated Tie6Ale4V alloy, which was beneficial for both water management and improving corrosion resistance.

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“…From previous works, it is known that ZrC x N 1-x coatings have attracted increasing attention [7] because of theirs wear resistance, hardness, thermal stability, and especially corrosion resistance and biocompatibility [8][9][10][11][12][13], which are the most fundamental characteristics of biomaterials [14][15][16][17][18]. Silva et al demonstrated that ZrC x N 1−x and ZrN coatings give rise to lower friction coefficient and improve anti-abrasion compared with TiN coatings [16].…”

Section: Introductionmentioning

confidence: 99%