Functional properties of the novel hybrid coatings combined of the oxide and DLC layer as a protective coating for AZ91E magnesium alloy

Molak, Rafał M.; Topolski, Krzysztof; Spychalski, Maciej; Dulińska-Molak, Ida; Morończyk, Bartosz; Pakieła, Zbigniew; Nieużyła, Ł.; Mazurkiewicz, Michał; Wojucki, Michał; Gebeshuber, Andreas; Piotrowska, N.

doi:10.1016/j.surfcoat.2019.125040

Cited by 17 publications

(12 citation statements)

References 42 publications

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“…Hot filament chemical vapor deposition (HFCVD) is based on the dissociation of precursor gases near a hot fiber and the formation of a film on a substrate kept at a much lower temperature than that in the classical chemical vapor deposition method. The relatively low temperature allows the processing of thermally sensitive materials [32][33][34][35][36].…”

Section: Deposition Techniques For Dlc Filmmentioning

confidence: 99%

Preparation and Characterization of Diamond-like Carbon Coatings for Biomedical Applications—A Review

2023

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Diamond-like carbon (DLC) films are generally used in biomedical applications, mainly because of their tribological and chemical properties that prevent the release of substrate ions, extend the life cycle of the material, and promote cell growth. The unique properties of the coating depend on the ratio of the sp3/sp2 phases, where the sp2 phase provides coatings with a low coefficient of friction and good electrical conductivity, while the share of the sp3 phase determines the chemical inertness, high hardness, and resistance to tribological wear. DLC coatings are characterized by high hardness, low coefficient of friction, high corrosion resistance, and biocompatibility. These properties make them attractive as potential wear-resistant coatings in many compelling applications, including optical, mechanical, microelectronic, and biomedical applications. Another great advantage of DLC coatings is that they can be deposited at low temperatures on a variety of substrates and can thus be used to coat heat-sensitive materials, such as polymers. Coating deposition techniques are constantly being improved; techniques based on vacuum environment reactions are mainly used, such as physical vapor deposition (PVD) and chemical vapor deposition (CVD). This review summarizes the current knowledge and research regarding diamond-like carbon coatings.

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Section: Deposition Techniques For Dlc Filmmentioning

confidence: 99%

Preparation and Characterization of Diamond-like Carbon Coatings for Biomedical Applications—A Review

2023

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“…Besides, a good base is formed for applying subsequent organic coatings [90]. Some other coating treatment methods have been also developed such as vapor-phase processes, hybrid coatings, anodizing, conversion coatings, and electrochemical plating (electroplating) [1,[91][92][93].…”

Section: Corrosion-resistant Coatings For Mg and Its Alloysmentioning

confidence: 99%

Recent progress in materials used towards corrosion protection of Mg and its alloys

Ghazanfari

Hasanizadeh

Eskandarinezhad

et al. 2020

jcc

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“…Li et al deposited DLC films on AZ91 at different C 2 H 2 flows after a Si bottom layer was fabricated first [5], and the DLC films prepared at low flow rates have higher hardness and better wear resistance but poorer corrosion resistance. Molak et al [6] deposited Si-DLC coating on oxidized AZ91E alloy based on the dissociation of precursor gases (Si(CH 3 ) 4 and C 2 H 2 ) near the hot fiber. The coating shows more favorable anti-corrosion properties.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Wear and Corrosion Resistance of AZ91 Magnesium Alloy via Adherent Si-DLC Coating with Si-Interlayer: Impact of Biasing Voltage

Cui,

Yang

2024

Coatings

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Magnesium alloys are the lowest-density structural metals with a wide range of applications, such as aircraft skins, engine casings and automobile hubs. However, its low surface hardness and non-corrosion resistance in natural environments limit its wide range of applications. In this work, Si-DLC coatings (Si: 15 at.%) are fabricated on AZ91 alloy using a hollow cathode discharge combined with a DC bias voltage from 0 to −300 V to increase the deposition rate and modulate the structure and properties of the coatings. The Si interlayer with a thickness of around 0.6 µm is deposited first to enhance the adhesion. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy are used to investigate the effect of DC bias on the microstructure evolution of Si-DLC coatings. Meanwhile, corrosion and wear resistance of the coatings at various bias voltages have been investigated using electrochemical workstations and pin-on-desk wear testers. It is shown that the bias-free coating has a loose structure and is less resistant to corrosion and wear. The bias coating has a compact structure, small carbon cluster size, high chloride ion corrosion resistance, and high wear resistance against Al2O3 spheres. The corrosion potential of the coating bias at −300 V is −0.98 V, the corrosion current density is 1.35 × 10−6 A·cm−2, the friction coefficient is 0.08, and the wear rate is 10−8 orders of magnitude. The formation of SiC nanocrystals and high sp3-C, as well as the formation of transfer films on the surface of their counterparts, are the main reasons for the ultra-high wear resistance of the bias coatings. The wear rate, coefficient of friction, and corrosion rate of the coating are 0.0069 times, 0.2 times, and 0.0088 times that of the AZ91 alloy, respectively. However, the bias coating has only short to medium-term protection against the magnesium alloy and no long-term protection due to cracks caused by its high internal stress.

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Functional properties of the novel hybrid coatings combined of the oxide and DLC layer as a protective coating for AZ91E magnesium alloy

Cited by 17 publications

References 42 publications

Preparation and Characterization of Diamond-like Carbon Coatings for Biomedical Applications—A Review

Preparation and Characterization of Diamond-like Carbon Coatings for Biomedical Applications—A Review

Recent progress in materials used towards corrosion protection of Mg and its alloys

Enhanced Wear and Corrosion Resistance of AZ91 Magnesium Alloy via Adherent Si-DLC Coating with Si-Interlayer: Impact of Biasing Voltage

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