Characterisation and Corrosion-Erosion Behaviour of Carbide based Thermal Spray Coatings

Chatha, Sukhpal Singh; Sidhu, Hazoor Singh; Sidhu, Buta Singh

doi:10.4236/jmmce.2012.116041

Cited by 56 publications

(44 citation statements)

References 35 publications

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Section: Introductionmentioning

confidence: 99%

“…The protection of pipeline steel by the use of inorganic coatings has been reported by many researchers [19][20][21][22]. Fan et al [19,20] investigated the protection of pipeline steels enamel coatings, while Chatha et al [21] studied the effect of the Cr 3 C 2 -NiCr coating layer on the corrosion protection of T91 boiler steel under different types of environments. The authors [21] claimed that this coating offers a high melting point and maintains high hardness, strength and wear resistance up to a maximum operating temperature of 900 • C. Tillmann et al [22] also claimed that the Cr 3 C 2 -NiCr coating features a very low porosity, low oxidization and low carbide decomposition or carbide-matrix dissolution, which leads to increasing hardness and abrasion resistance.…”

Section: Introductionmentioning

confidence: 99%

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Cr3C2-NiCr Coating for the Protection of API Steel Corrosion in Concentrated Sodium Chloride Solution

2020

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In the present work, a layer of 75%Cr3C2−25%NiCr with thickness of 260 ± 15 µm was coated onto the API-2H pipeline steel surface using high-velocity oxy-fuel deposition. The effect of 75%Cr3C2−25%NiCr coating on the corrosion of the API steel after 1 h, 24 h, and 48 h exposure in 4.0% sodium chloride solutions is reported. The corrosion tests were performed using potentiodynamic cyclic polarization, electrochemical impedance spectroscopy, and chronoamperometric current–time techniques along with scanning electron microscopy and energy-dispersive X-ray analyses. The curves of polarization indicated that the presence of the coating increases the corrosion resistance of the steel through decreasing its corrosion current and corrosion rate. Impedance data showed that all resistances recorded higher values for the coated API steel. Chronoamperometric current–time measurements confirmed that the coated API steel has lower absolute current values and thus lower corrosion rate. All results proved that the presence of 75%Cr3C2−25%NiCr coating enhances the corrosion resistance of the API steel via the formation of a protective layer of Cr and Ni oxides, which could lead to decreasing the corrosion rate.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cr3C2-NiCr Coating for the Protection of API Steel Corrosion in Concentrated Sodium Chloride Solution

2020

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“…It was The carbides in the metallic matrix can individually act as cathodes in the microgalvanic cells [13]. It has been shown that the connection of the carbide (Cr 3 C 2 as cathode) to the metal matrix (NiCr as anode) forms a microgalvanic cell that increases the corrosion rate of the NiCr binder, and inherently destroys the coatings [14,15]. The galvanic cell leads to a severe attack of the NiCr binder once the coating is penetrated, and an electric contact between NiCr and Cr 3 C 2 is formed in an electrically conducting corrosive liquid [16].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of Bilayer Thermal-Spray Coatings in Low-Temperature Corrosion Protection

Sadeghimeresht

Markocsan

2017

Coatings

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Cr 3 C 2 -NiCr coatings are greatly used to protect critical components in corrosive environments and to extend their lifetime and/or improve functional performance. However, the pores formed during spraying restrict the coating's applicability area for many corrosion protection applications. To overcome this technical challenge, bilayer coatings have been developed, in which an additional layer (the so-called "intermediate layer") is deposited on the substrate before spraying the Cr 3 C 2 -NiCr coating (the so-called "top layer"). The corrosion behavior of the bilayer coating depends on the composition and microstructure of each layer. In the present work, different single-layer coatings (i.e., Cr 3 C 2 -NiCr, Fe-and Ni-based coatings) were initially sprayed by a high-velocity air fuel (HVAF) process. Microstructure analysis, as well as electrochemical tests, for example, open-circuit potential (OCP) and polarization tests, were performed. The potential difference (∆E) had a great influence on galvanic corrosion between the top and intermediate layers, and thus, the coatings were ranked based on the OCP values (from high to low) as follows: NiCoCrAlY > NiCr > Cr 3 C 2 -NiCr > NiAl > Fe-based coatings (alloyed with Cr) > pure Ni. The Ni-based coatings were chosen to be further used as intermediate layers with the Cr 3 C 2 -NiCr top layer due to their capabilities to show high OCP. The corrosion resistance (R p ) of the bilayer coatings was ranked (from high to low) as follows: NiCoCrAlY/Cr 3 C 2 -NiCr > NiCr/Cr 3 C 2 -NiCr > NiAl/Cr 3 C 2 -NiCr > Ni/Cr 3 C 2 -NiCr. It was shown that splat boundaries and interconnected pores are detrimental for corrosion resistance, however, a sufficient reservoir of protective scale-forming elements (such as Cr or/and Al) in the intermediate layer can significantly improve the corrosion resistance.

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“…While theoretically, coatings may be employed in a variety of ways to modify, hinder or thwart the corrosion reaction [2]. Various conventional methods such as carburizing, nitriding, electroplating are used over a century to protect tools; however, the development of the hard protective coatings in the narrower sense, started in the sixties with the discovery of chemical vapour deposition and physical vapour deposition tech-niques [3]. In recent times, modern deposition techniques such as thermal spray and laser cladding have become more popular and give large throughput in shortest possible time [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ceramic Powder Coatings on Low Carbon Steel

Olaseinde¹,

Adewuyi²

2016

MSA

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Effect of ceramic powder coating on low carbon steel samples was presented. Electrostatic deposition method was used to produce ceramic coatings on low carbon steels. The coatings were fabricated over a range of temperatures (100˚C-400˚C). Detailed investigation on the corrosion behaviour, the hardness property and electrode potential of the fabricated and uncoated samples are reported. The ceramic materials used are locally available in Ondo-State Nigeria. The coating temperatures affect the rate of corrosion, the hardness property and the electrical resistivity of the coated steel sample. The sample coated at 300˚C with ceramic powder Y showed the best corrosion resistance in 0.5 M NaCl solution. The highest resistivity occurred in the sample coated at 300˚C with ceramic powder Z. All the samples coated with ceramic powder Y had better corrosion resistance in 0.5 M NaCl than the one coated by sample Z.

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Characterisation and Corrosion-Erosion Behaviour of Carbide based Thermal Spray Coatings

Abstract: Thermal spraying has emerged as a suitable and effective surface engineering technology and is

Cited by 56 publications

References 35 publications

Cr3C2-NiCr Coating for the Protection of API Steel Corrosion in Concentrated Sodium Chloride Solution

Cr3C2-NiCr Coating for the Protection of API Steel Corrosion in Concentrated Sodium Chloride Solution

Electrochemical Behavior of Bilayer Thermal-Spray Coatings in Low-Temperature Corrosion Protection

Effect of Ceramic Powder Coatings on Low Carbon Steel

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