Pitting corrosion – Preferred chloride diffusion pathways in physical vapor deposited AlCrN coatings

Hudak, O.E.; Bahr, A.; Kutrowatz, P.; Wójcik, Tomasz; Bohrn, Fabian; Solyom, L.; Schuster, R.; Shang, Lunlin; Hunold, O.; Polcik, P.; Heller, M.; Felfer, Peter; Ball, G.; Riedl, H.

doi:10.1016/j.corsci.2022.110901

Cited by 8 publications

(5 citation statements)

References 21 publications

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“…The respective HR-TEM (a) image features a well-defined column-boundary, which would, in case of a subsequent corrosion experiment, offer a preferential diffusion path for chloride species. Such fast track diffusion pathways for chloride species have been investigated in a previous study [1], and deemed to be a significant draw-back in effectively providing corrosion protection. As vanadium is substituted for chromium, first to 11.6 at% (P7) and then further to 22.3 at% V-content (P10), the SAEDs feature…”

Section: Microstructure and Composition Analysismentioning

confidence: 99%

“…When considering that porosities and fast track diffusion sites along incoherent grain boundaries contribute to a more anodically active galvanic couple (coating/alloy), control over the open porosity of protective coatings is of great importance [1]. Therefore, we would like to put the aforementioned electrochemical data in context with the open porosity values (Eqs.1-2).…”

Section: Open Porosity Vs V-contentmentioning

confidence: 99%

“…embedded macroparticles, porosity due to highly orientated columnar growth, pin holes, etc.) allow the corrosive medium to travel unhindered to the coating/substrate interface and generate galvanic couples [1][2][3]. Depending on the materials that make up this galvanic cell, coatings may either act as the anodic element (providing sacrificial protection) [4], or act as the cathodic element, in which anodic dissolution and pitting of the substrate material ensues [5].…”

Section: Introductionmentioning

confidence: 99%

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Improved Corrosion Resistance of Cathodic Arc Evaporated Al0.7cr0.3-Xvxn Coatings in Nacl-Rich Media

Hudak

Kutrowatz

Wójcik

et al. 2023

Preprint

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Section: Microstructure and Composition Analysismentioning

confidence: 99%

Section: Open Porosity Vs V-contentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Improved Corrosion Resistance of Cathodic Arc Evaporated Al0.7cr0.3-Xvxn Coatings in Nacl-Rich Media

Hudak

Kutrowatz

Wójcik

et al. 2023

Preprint

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“…This is due to their ability to reduce friction in metal forming dies, withstand mechanical and thermal loads during cutting procedures, and improve the mechanical and tribological properties, as well as the corrosion resistance of metals. This can be attributed to several factors, including the excellent resistance to oxidation, its short interatomic distance, and the formation of adherence and dense Al 2 O 3 films during service 12–14 . Several methods have been developed and utilized for producing thin metallic nitride films on solid substrates, including physical vapor deposition (PVD) and chemical vapor deposition (CVD).…”

Section: Introductionmentioning

confidence: 99%

“…This can be attributed to several factors, including the excellent resistance to oxidation, its short interatomic distance, and the formation of adherence and dense Al 2 O 3 films during service. [12][13][14] Several methods have been developed and utilized for producing thin metallic nitride films on solid substrates, including physical vapor deposition (PVD) and chemical vapor deposition (CVD). Sputtering involves the evaporation of materials from a target source on the substrate by highenergy ions.…”

Section: Introductionmentioning

confidence: 99%

The effect of substrate bias voltage on the mechanical and electrochemical corrosion properties of multilayered CrN/CrAlN coatings produced by cathodic arc evaporation

Baseri

Mohammadi

Ghatee

et al. 2023

Int J Applied Ceramic Tech

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The Multilayer CrN/CrAlN film was deposited on the SS420 substrate by cathodic arc evaporation technique. The effect of substrate bias‐voltage was investigated on the microstructure, surface morphology, and mechanical and electrochemical corrosion properties of the deposited film. The deposited CrN/CrAlN coatings were characterized by XRD and FESEM techniques. Mechanical properties, corrosion resistance, and surface morphology of the coated samples were studied by nano‐indentation, polarization method, electrochemical impedance spectroscopy, and atomic force microscopy, respectively. Adhesive and dense nanostructure CrN and CrAlN phases were successfully deposited on the substrate. The refinement of the coating crystallite was observed from 31.2 to 24.3 nm by increasing the substrate bias voltage, this improved the mechanical properties of the coating. The number of macroparticles, the number of pinholes and porosities, and the surface roughness of coatings significantly decreased by increasing the substrate bias voltage. The CrN/CrAlN coating reduced the corrosion current density in contrast to the SS420 substrate. Better corrosion resistance was obtained for the coating deposited at 150 V of bias voltage due to lower defects in the film structure.This article is protected by copyright. All rights reserved

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Nitride coatings for environmental barriers: the key microscopic mechanisms and momentous applications of first-principles calculations

He,

Liu,

Zhou

et al. 2024

Surf. Sci. Tech.

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Protective nitride coatings are widely used in various industrial fields due to their exceptional mechanical, structural, and chemical stabilities under various harsh environments. Many nitride coatings have the inherent barrier function against the attack of environmental agents, making them splendid materials for, e.g., hydrogen permeation barriers, high-temperature-environment barriers, and tribocorrosion coatings. However, the long-term contact with aggressive environments may still result in the degradation of these coatings, where many processes occuring on various atomistic microstructures (e.g., surfaces, vacancies, grain boundaries, and coating/substrate interfaces) usually play the key roles. Here, we make a timely review on the microscopic mechanisms associated with the interactions between various microstructural entities and environmental agents, for which the first-principles calculations will be powerful in quantitatively revealing the essential interatomic bondings and thermodynamic/kinetic trends therein. Many successful application cases and possible future directions of first-principles calculations for these three kinds of nitride coatings are discussed here, which can shed much light on more optimization ways towards superior and durable nitride coatings through precise chemical tuning and structural design in the future.

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Pitting corrosion – Preferred chloride diffusion pathways in physical vapor deposited AlCrN coatings

Cited by 8 publications

References 21 publications

Improved Corrosion Resistance of Cathodic Arc Evaporated Al0.7cr0.3-Xvxn Coatings in Nacl-Rich Media

Improved Corrosion Resistance of Cathodic Arc Evaporated Al0.7cr0.3-Xvxn Coatings in Nacl-Rich Media

The effect of substrate bias voltage on the mechanical and electrochemical corrosion properties of multilayered CrN/CrAlN coatings produced by cathodic arc evaporation

Nitride coatings for environmental barriers: the key microscopic mechanisms and momentous applications of first-principles calculations

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