Structure and corrosion properties of Cr coating deposited on aerospace bearing steel

Wang, Fangfang; Zhang, Fengxiang; Liu, Zheng; Zhang, Hu

doi:10.1016/j.apsusc.2017.06.099

Cited by 41 publications

(10 citation statements)

References 34 publications

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“…Other works has proved that microcracks are caused by the production process, which is inherent. 17 For Pardo et al, 11 the resistance of the passive film is determined by the environmental conditions that chromium coated steels and stainless steels are exposed, as well as by the composition of the alloy. Under the action of aggressive ions, such as chloride anion, the local breakdown of passivity occurs, especially at sites of local with discontinuities, micro-cracks and pores causing pitting corrosion.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of Micro-Crack Incidence and their Influence on the Corrosion Resistance of Steel Coated with Different Chromium Thicknesses

Santos¹,

Serenário²,

Pinto³

et al. 2019

Rev. Virtual Quim.

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Avaliação da Incidência de Micro Trincas e suas Influências na Resistência à Corrosão do Aço Revestido com Diferentes Espessuras de Cromo Resumo: Revestimentos de cromo são frequentemente utilizados para aplicação onde a corrosão e desgaste estão combinados. O objetivo deste trabalho foi avaliar a incidência de micro trincas e a resistência a corrosão por pites de cinco diferentes espessuras de revestimento de cromo aplicadas sobre o aço C45K. Estes revestimentos de cromo foram aplicados através do processo de eletrólise. Cinco amostras foram preparadas com espessuras de 0 a 34 µm. Os revestimentos foram caracterizados através da microscopia eletrônica de varredura (MEV), microscopia ótica (MO) e microdureza. A resistência à corrosão foi avaliada através de ensaios eletroquímicos de curva de polarização e potencial vs. tempo em uma solução de 3.5 % de NaCl. Ensaios em câmara com névoa salina também foram realizados. Os resultados mostraram que a medida que se aumenta a camada de cromo obtém-se uma maior resistência à corrosão por barreira, isso é na superfície das amostras. Entretanto os ensaios de salt-spray mostraram que todas as amostras apresentaram corrosão localizada após 120 horas. Através das imagens de MEV ficou claro o desenvolvimento das micro trincas após os ensaios de polarização. A incidência de micro trincas é especulada como um fator determinante para a degradação da superfície, uma vez que os íons cloreto tem facilidade em penetrar entre as trincas, causando corrosão localizada no substrato. Palavras-chave: Revestimentos de cromo; micro trincas; corrosão localizada; câmara de névoa salina; polarização anódica.

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Section: Resultsmentioning

confidence: 99%

Evaluation of Micro-Crack Incidence and their Influence on the Corrosion Resistance of Steel Coated with Different Chromium Thicknesses

Santos¹,

Serenário²,

Pinto³

et al. 2019

Rev. Virtual Quim.

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“…Let us consider the results of the influence of two main parameters responsible for the energy state of the deposited particles (negative bias potential in a constant and high-voltage pulse forms) on the structuralphase changes in the coatings obtained by vacuum-arc evaporation of pure chromium in high vacuum (at a pressure of 210 -5 Torr). The deposited in such way coatings are effectively used for protection of bearings of heavy-loaded elements of gas turbine aggregates and other elements [21].…”

Section: Results and Their Discussionmentioning

confidence: 99%

Structure and Properties of Vacuum-arc Coatings of Chromium and Its Nitrides Obtained under the Action of Constant and Pulse High-voltage Bias Potential

Sоbоl¹,

Postelnyk²,

Mygushchenko³

et al. 2017

J. Nano- Electron. Phys.

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To reveal the regularities of structural engineering of vacuum-arc coatings based on chromium and its nitrides, the influence of the main physicotechnological factors (the pressure of the nitrogen atmosphere and the bias potential) in the formation of coatings was studied. It was discovered that during the deposition of chromium coatings the formation of the texture axis [100], as well as the macrodeformation of compression is happening. The supply of a high-voltage negative pulse potential to the substrate increases the mobility of the deposited atoms and leads to relaxation of the compression deformation. As the pressure increases from 210-5 Torr to 4.810-3 Torr, the phase composition of the coatings changes: Cr (JCPDS 06-0694) → Cr2N(JCPDS 35-0803) → CrN(JCPDS 11-0065). The supply of high-voltage pulses leads to the formation of a texture of crystallites with parallel growth surfaces planes having d ≈ 0.14 nm. The structure obtained by pulsed high-voltage action makes it possible to increase the hardness of the coating to 32 GPa and reduce the friction coefficient to 0.32 in the "chromium nitride-steel" system and to 0.11 in the "chromium nitride-diamond" system. The results obtained are explained from the viewpoint of increasing the mobility of atoms and the formation of cascades of displacements when using an additional high-voltage potential in the pulse form during the deposition of chromium-based coatings.

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“…Surface engineering plays a vital role in the reduction of wear as well as corrosion-induced damages in hi-tech industries [1,2]. Material degradation in the service span of thermal engineering is not only disruptive but also inexpedient to the economy of production.…”

Section: Introductionmentioning

confidence: 99%

Tribological Characteristics of Carbon Nanotubes‐Reinforced Plasma‐Sprayed Al₂O₃‐TiO₂ Ceramic Coatings

Kalangi

Bolleddu

Allasi

2021

Advances in Materials Science and Engineering

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Thermal-sprayed coatings are widely used in various oil and gas industries for wear and corrosion applications. However, increasing performance and requirements make conventional coatings inadequate for future needs. Furthermore, the heat conductivity of bulk materials cannot be minimized easily. Therefore, the use of low porous coating with nanocomposite doping is an effective way to produce coatings with reduced thermal conductivity. Plasma-sprayed Al2O3-TiO2 coatings are found in a wide range of applications recently in many industries because of their exceptional properties including low expenses and ease of availability. In this work, the wear-resistant and low porous coatings of Al2O3 + 3 wt%TiO2 and respective carbon nanotube (CNT) doped coatings are prepared and characterized. The coatings are deposited on the AISI 1020 steel substrate using air plasma spraying. The impact of CNTs reinforcement on the percentage of pores and wear performance of coatings is investigated. Also, wear tracks morphology is investigated to determine the wear mechanism that is responsible for the wear of coatings. From the analysis, it is observed that the formation of cracks as well as micropores is decreased by the addition of carbon nanotubes. Moreover, uniform CNT distribution and good adhesion of coatings with the substrate are the major factors that improve the wear performance of the coated surface.

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Structure and corrosion properties of Cr coating deposited on aerospace bearing steel

Cited by 41 publications

References 34 publications

Evaluation of Micro-Crack Incidence and their Influence on the Corrosion Resistance of Steel Coated with Different Chromium Thicknesses

Evaluation of Micro-Crack Incidence and their Influence on the Corrosion Resistance of Steel Coated with Different Chromium Thicknesses

Structure and Properties of Vacuum-arc Coatings of Chromium and Its Nitrides Obtained under the Action of Constant and Pulse High-voltage Bias Potential

Tribological Characteristics of Carbon Nanotubes‐Reinforced Plasma‐Sprayed Al₂O₃‐TiO₂ Ceramic Coatings

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Structure and corrosion properties of Cr coating deposited on aerospace bearing steel

Cited by 41 publications

References 34 publications

Evaluation of Micro-Crack Incidence and their Influence on the Corrosion Resistance of Steel Coated with Different Chromium Thicknesses

Evaluation of Micro-Crack Incidence and their Influence on the Corrosion Resistance of Steel Coated with Different Chromium Thicknesses

Structure and Properties of Vacuum-arc Coatings of Chromium and Its Nitrides Obtained under the Action of Constant and Pulse High-voltage Bias Potential

Tribological Characteristics of Carbon Nanotubes‐Reinforced Plasma‐Sprayed Al2O3‐TiO2 Ceramic Coatings

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Tribological Characteristics of Carbon Nanotubes‐Reinforced Plasma‐Sprayed Al₂O₃‐TiO₂ Ceramic Coatings