Modulation of structure and corrosion behavior of Si-DLC coatings on AZ31 by applying a self-source bias

Li, Haitao; Sun, Pengfei; Qi, Aiyi; Zhang, Shengjin; Futing, Zhang

doi:10.1016/j.ceramint.2023.07.194

Cited by 6 publications

(4 citation statements)

References 45 publications

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“…Therefore, we design the thickness of the Si layer to be 0.6 µm. The deposition method is a mesh hollow cathode discharge [12]. A metallic cage was positioned atop the AZ91 alloy to form a hollow cathode.…”

Section: Methodsmentioning

confidence: 99%

“…The chemical composition and chemical states were characterized by energy disperse spectroscopy (EDS, EDAX-Falcon, Mahwah, NJ, USA) and X-ray photoelectron spectroscopy (XPS, AXIS Mode, Waltham, MA, USA). The Raman spectra were decomposed by the Gaussian function into two Gaussian peaks (D band and G band) [12]. The XPS was performed with an Al X-ray source at a pass energy of 160 eV after the Ar + erosion.…”

Section: Methodsmentioning

confidence: 99%

“…The optimized bias voltage of 600 V results in the highest sp 3 hybridization bonds and nanohardness, as well as the lowest abrasion rate. Li et al [12] fabricated Si-DLC coating on AZ31 alloy. The −500 V bias coating has the highest sp 3 phase and superior short-term anti-corrosion capability in a 3.5 wt.% NaCl solution.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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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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“…In addition to metal doping, non-metals such as Si [13][14][15], F [16], and N [17] are also used to prepare different types of DLC films, which typically exhibit excellent mechanical [18], tribological [19], and chemical properties [1]. Hydrogenated DLC has poor thermal stability and optical properties due to the presence of CH bonds.…”

Section: Introductionmentioning

confidence: 99%

Effect of Gas Flow Rate and Ratio on Structure and Properties of Nitrogen-Doped Diamond-like Carbon Films

Ma,

Wang,

et al. 2024

Applied Sciences

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Diamond-like carbon (DLC) has attracted much attention due to its unique properties such as high chemical inertness, optical transparency, and high biocompatibility. In this study, the total gas flow rate was kept constant, while the ratio of reactive gases was varied to deposit nitrogen-doped diamond-like carbon thin films on glass substrates using radiofrequency plasma-enhanced chemical vapor deposition. The effects of the gas flow ratio on the composition, microstructure, surface morphology, and optical properties of the thin films were investigated through extended deposition times. It was found that with an increase in the nitrogen-to-methane gas flow ratio, the film surface became smoother and more compact. The maximum transmittance in the visible range reached 90%, and the highest and lowest transmittance in the same ultraviolet wavelength region differed by up to 25.62% among several sample groups. The optical bandgap decreased from 3.58 eV to 3.46 eV, contrary to the trend of the sp2 fraction variation. Compared with other studies, this study considered the preparation of nitrogen-doped diamondoids using a chemical vapor deposition method with a lesser total gas flow rate passed into it, which provides practical data reference value for the preparation of N-DLC.

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Enhanced adhesion and wear resistance of DLC films on AZ31 alloy achieved with high bias voltage

Li,

Liu,

Sun

et al. 2024

Heliyon

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Modulation of structure and corrosion behavior of Si-DLC coatings on AZ31 by applying a self-source bias

Cited by 6 publications

References 45 publications

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

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

Effect of Gas Flow Rate and Ratio on Structure and Properties of Nitrogen-Doped Diamond-like Carbon Films

Enhanced adhesion and wear resistance of DLC films on AZ31 alloy achieved with high bias voltage

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