Alternatives for hard chromium plating: Nanostructured coatings for severe-service valves

Vernhes, L.; Azzi, M.; Klemberg-Sapieha, J.E.

doi:10.1016/j.matchemphys.2013.03.065

Cited by 29 publications

(5 citation statements)

References 16 publications

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“…In terms of hardness, the number of factors that influence this property makes it difficult to offer representative average values for each of the coatings, but it is possible to providel a range of hardness. The hardness of hard chrome is usually reported between 950 and 1100 hv 50 (or 8.5 GPa for microhardness and 13 GPa for nano hardness) [215][216][217][218][219]. The mechanical properties of electrodeposited hard chrome decrease when the coating is annealed, with values of 840 hv 100 reported for hard chrome coatings heat-treated at 400 • C [217].…”

Section: En-b Vs En-p and Other Hard And Wear-resistant Coatingsmentioning

confidence: 99%

Recent advances in electroless nickel‑boron coatings

Vitry

Hastir

Mégret

et al. 2022

Surface and Coatings Technology

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Section: En-b Vs En-p and Other Hard And Wear-resistant Coatingsmentioning

confidence: 99%

Recent advances in electroless nickel‑boron coatings

Vitry

Hastir

Mégret

et al. 2022

Surface and Coatings Technology

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“…While the presence of Tungsten and Cobalt in the coating increases the wear resistance, Nickel and Molybten negatively affect the tribological properties of the coatings. In recent years, coatings in W-C-Co combination have a positive effect on wear and surface hardness values (Moura e Silva et al, 2006;Vernhes et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Wear performance of GGG60 ductile iron rollers coated with WC-Co by electro spark deposition

Buğday,

Karalı,

Talaş

2023

Rev. metal.

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Nodular cast irons are used in many industrial applications such as machine frames and body, rollers and engine blocks due to their higher strengths and ductility with good machinability comparable to grey cast irons. In this study, the outer surface of nodular cast irons (GGG-60) was coated with WC/Co using electro spark deposition (ESD). The aim of the study is to improve both the surface quality and wear behaviour with the coatings formed on the surface of the plastic deformation rollers, whose wear resistance decreases over the time due to high stress working conditions. Heat treatment at 950 ºC for 2 h was applied to the GGG60 specimen rollers and half of the rollers were uncoated and the other half was coated with WC-Co electrodes. The wear behaviour of the heat treated and coated surfaces was measured by ball-on-disc wear method using Al2O3 ball bearing with a diameter of 6 mm for a sliding distance of 250 m at a sliding rate of 6.5 m·s-1 under a dry condition, and using a load of 40 N. WC/Co coatings were successfully applied to rollers. In the SEM/EDS images, the presence of W, Fe, C, Co and Al elements in the coated part of the rollers and Fe, C and Al elements in the uncoated region were detected. It was concluded that Coating and heat treatment increased the wear resistance by nearly 5 times and decreased the friction coefficient by 2.13 times.

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“…Vernhes et al [11] indicated that the friction coefficient of Cr 2 O 3 coatings was ~0.5. Meanwhile, the coefficient of friction (COF) of TiO 2 -Cr 2 O 3 coatings were ranging from 0.6 to 0.7.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of Chromia and Chromia Composite Coatings Deposited by Plasma Spraying

et al. 2022

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Cr2O3 and Cr2O3–SiO2-TiO2 coatings are deposited on P265GH steel using atmospheric plasma spraying. The influence of silicon oxide—titanium oxide addition on the surface morphology of the coatings, phase composition and tribological properties under non-lubricated sliding conditions are investigated. The addition of SiO2-TiO2 led to the formation of a more uniform surface morphology and reduce the surface roughness of the Cr2O3 coatings. The X-ray diffraction (XRD) studies indicated that both coatings are composed of an eskoloite Cr2O3 phase. The friction coefficients of the Cr2O3 coating are 0.504 and 0.431 when 1 N and 3 N loads were used, respectively. Meanwhile, the Cr2O3–SiO2-TiO2 coating demonstrated slightly lower values of friction coefficients under similar loads. The specific wear rate of the as-sprayed coating is reduced with the addition of SiO2-TiO2. It was found that the wear rates of the Cr2O3 and Cr2O3–SiO2-TiO2 coatings are up to 20 times lower compared to the steel substrate. This article is an expanded version of the “19th international conference on plasma physics and applications” conference abstract.

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Alternatives for hard chromium plating: Nanostructured coatings for severe-service valves

Cited by 29 publications

References 16 publications

Recent advances in electroless nickel‑boron coatings

Recent advances in electroless nickel‑boron coatings

Wear performance of GGG60 ductile iron rollers coated with WC-Co by electro spark deposition

Tribological Properties of Chromia and Chromia Composite Coatings Deposited by Plasma Spraying

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