A methodology for characterizing the electrochemical stability of DLC coated interlayers and interfaces

Ilic, Emilija; Pardo, Arcadio; Suter, Thomas; Mischler, S.; Schmutz, Patrik; Hauert, Roland

doi:10.1016/j.surfcoat.2019.07.055

Cited by 15 publications

(7 citation statements)

References 36 publications

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“…Similar results were also obtained in a previous research work [31]. A recent study [78] may have provided the answer to this enigma: the authors highlighted the crucial role of metallic-based interlayers in increasing overall corrosion susceptibility, due to the formation of galvanic cells, particularly if Cr-C based interlayers are used. Therefore, the corrosion of the coatings in the present study should be due to the presence of the Cr-based interlayer and not to the highly stable a-C:H coating.…”

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confidence: 82%

Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System

et al. 2021

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Stainless steels (SS) are the most-used alloys for manufacturing fixed orthodontic appliances due to their attractive set of mechanical properties, biocompatibility, and high corrosion resistance. Nevertheless, during regular orthodontic treatments–taking at least around 2 years–the intraoral environment inevitably degrades these bioalloys, releasing metallic ions into the oral cavity. In the first part of this in vitro study, the corrosion resistance of commercial SS appliances (brackets, tubes, and bands) was evaluated in Fusayama-Meyer artificial saliva at pH values of 2.3 and 6.8 over the course of 30 days. As expected, the results corroborated that salivary pH highly influences corrosion behaviour. Released Ni, Cr, and Fe were within dietary intake values. In the second part, a novel approach for oral corrosion prevention based on the chemical inertness of DLC materials is presented. SS surfaces were functionalized with biocompatible a-C:H-sputtered coatings and submitted to the same experimental conditions. The anticorrosion ability of this system was demonstrated, preventing the pitting corrosion that occurred on the SS substrates. Despite the galvanic coupling effect due to the presence of the Cr-based interlayer, this study enhanced the potential use of the reactive sputter-deposited a-C:H coatings in orthodontics.

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confidence: 82%

Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System

et al. 2021

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“…The corrosion current density (I corr ) of the G1 type of coating in the anode reaction region is obviously higher than that of the G2 type and G3 type, indicating the G1 type of coating has the poorest corrosion resistance of the three. That is because the G1 type could be destabilized with anodic polarization and contribute to the current response in the curve of Figure 4a [25]. Therefore, the gradual increase in current during anodic polarization is a contribution of the DLC instability itself, i.e., the oxidation/dissolution of C within the DLC, or of the underlying Si interlayer at local DLC coating growth defects [26].…”

Section: Corrosion Behaviormentioning

confidence: 99%

Structure and Properties of DLC Films Deposited on Mg Alloy at Different C2H2 Flows of Magnetron Sputtering Process

Sun

Cheng

2021

Coatings

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Diamond-like carbon (DLC) film is widely used due to its excellent properties, such as high hardness and high wear resistance. To investigate the advantages of DLC film applied on the surface of Mg alloy, direct current (DC) pulse magnetron sputtering was used to prepare DLC film via plasma sputtering a graphite target and introducing C2H2 gas. The silicon interlayer was fabricated by sputtering the Si target. A scanning electron microscope (SEM), transmission electron microscope (TEM), a nano-indentation instrument, an electrochemical workstation and a pin-on-disc tester were employed to obtain the surface morphology, microstructure, mechanical properties, corrosion behavior and wear resistance of the obtained film, respectively. The results show that the DLC films are dense and compact, and the structure changes from amorphous to nanocrystalline with the increase of C2H2 flow. The film prepared at low C2H2 flow has larger surface roughness, lower deposition rate, higher hardness and elasticity modulus, poorer corrosion resistance and better wear resistance, compared with the film prepared at higher acetylene flow. The self-corrosion potential of the obtained DLC film is higher than −0.95 V, the corrosion current density is 10−7 A/cm2 orders of magnitude, and the wear rate is 10−9 mm3/Nm orders of magnitude. The friction coefficient of the film is less than 0.065, the hardness is 17.3 to 22.1 MPa, and the elastic modulus is 145 to 170 MPa. The DLC films obtained on the surface of AZ91 alloy have good comprehensive properties.

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“…for implants [198]. Therefore, suitable interlayers are required [199]. Limited water penetration has also been detected by NR for silicone-like PPFs as e.g.…”

Section: Hydrophobic Surfacesmentioning

confidence: 99%

Plasma-controlled surface wettability: recent advances and future applications

Nikiforov

Hegemann

et al. 2022

International Materials Reviews

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Materials with the desirable surface wettability are of key importance in diverse applications. However, most of the existing chemical processes used for surface wettability control are often energy-inefficient, pollute the environment, and rely on harsh processing conditions. Therefore, highly-selective, green, and low-cost alternative fabrication techniques are in urgent demand. Low-temperature plasma processing is one such promising approach that satisfies the above requirements. In this review, we present recent advances in plasma processing to control surface wettability for diverse emerging applications in the environment, energy, and biomedicine fields. The underlying mechanisms of the plasma surface engineering, key features of the fabrication processes, and water-surface interactions are discussed. This review aims to guide further development of the plasma processing to effectively control the surface wettability of various surfaces. This effort is poised to contribute to the development of advanced functional materials targeting a broad range of applications.

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A methodology for characterizing the electrochemical stability of DLC coated interlayers and interfaces

Cited by 15 publications

References 36 publications

Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System

Salivary pH Effect on Orthodontic Appliances: In Vitro Study of the SS/DLC System

Structure and Properties of DLC Films Deposited on Mg Alloy at Different C2H2 Flows of Magnetron Sputtering Process

Plasma-controlled surface wettability: recent advances and future applications

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