Evaluation of Cyclic Oxidation and Hot Corrosion Behavior of HVOF-Sprayed WC-Co/NiCrAlY Coating

Somasundaram, B.; Kadoli, Ravikiran; Рамеш, М. Р.

doi:10.1007/s11666-014-0112-3

Cited by 24 publications

(3 citation statements)

References 28 publications

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“…Many other researchers suggested that the void reduction of interparticles is enhanced mainly by mechanical interlocking among the fine-fragmented particles with highly irregular shapes, therefore the particles are well packed and interlocked with each other in coating [10]. As-sprayed WC- the decomposition of carbides has taken place during the HVOF spraying [11]. The surface morphologies of the as-sprayed WC-17Co coating showed deposition and uniform distribution of the primary carbide phase.…”

Section: Discussionmentioning

confidence: 97%

Investigation of Hot Corrosion Behaviour of Uncoated and WC-17CO Coated Samples in Aggressive Molten Salt Environment

Singh¹,

Singh²,

Choudhary³

2017

IJMPERD

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Hot corrosion is usually a significant issue in power plant's boilers. The alloys and metals get corroded, once exposed to high temperature corrosion in air, or in actual boiler environment in power plants. In order to protect materials; thermal spraying is a newly developed technology that enhances high temperature corrosion resistance of boiler steels. In the present study, WC-17Co coating were deposited by HVOF technique on substrate ASTM-SA213-T91.

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Section: Discussionmentioning

confidence: 97%

Investigation of Hot Corrosion Behaviour of Uncoated and WC-17CO Coated Samples in Aggressive Molten Salt Environment

Singh¹,

Singh²,

Choudhary³

2017

IJMPERD

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“…A small amount of semi-molten and nonmolten particles is visible in the fully melted region (Ni) area. The presence of semi-molten and nonmolten particles provides the coating with high bonding strength and good wear resistance [34,35]. A few pores appear in black in the micrographs of both types of coating.…”

Section: Methodsmentioning

confidence: 99%

Introducing New Coating Material Alloy with Potential Elements for High Corrosion Resistance for Oil and Gas Application

Akhtari-Zavareh¹,

Sarhan²

2016

Advances in Tribology

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In petroleum and petrochemical industries, offshore and onshore systems have to function in an aggressive environment that exposes the production equipment components to thermal cycling and wear and corrosion. Although maintenance of material degradation in oil and gas is costly, internal and external parts of the equipment and pipelines must be well inspected and continually maintained. For this reason, highly advanced corrosion and wear-monitoring systems must be installed in the critical areas of the plant to protect pipes and equipment from seawater and crude oil. Therefore, researchers are in search of advanced materials and methods that could be applied in oil and gas pipelines and accessories for increasing their working time. The common manufacturing processing method for improving the surface of piping and accessories is overlay welding or cladding. This method has some limitations, such as its limitation for choosing materials. In addition, the high temperature of welding causes some defects on the final surface, such as thermal residual stress, cracking, and distortion in the substrate. The method is also time consuming and costly. However, the coating method provides a blend of unique properties with low cost. Thermal spray methods are cold spraying techniques that have a considerably less thermal stress, residual stress, and other defects. Among different thermal spray coating techniques, high-velocity oxygen fuel (HVOF) and plasma are the most commonly used thermal spraying coating processes to produce anti-wear and corrosion coatings with different types of materials such as metal, alloys, and ceramic composite. Furthermore, HVOF and plasma thermally sprayed coating processes induce microstructure heterogeneities, which increase the corrosion and wear resistance. In this research, one type of alloy with chemical composition NiCrCoAlY was chosen for increasing corrosion resistivity of carbon steel piping. A corrosion behavior of coated samples in seawater was investigated for 30 days. Potentiodynamic polarization and electrochemical impedance

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“…In most cases, the oxidation kinetics of MCrAlY coatings is mainly diffusion-controlled and the oxide growth rate follows a parabolic behavior 10 – 17 . There are limited studies on the deviation from parabolic behavior for the oxidized Ni-based and MCrAlY coatings for both cases of single overlay or bond coat for thermal barrier coatings (TBC) 18 – 21 . Generally, it has been reported that any deviation from parabolic rate law may be attributed to some parameters such as the partial pressure of the oxygen in the oxidizing atmosphere, rare of in-service heating and cooling, overall design of the part surface, composition and structural properties of the coatings and initiation of the microcracks in the coating structure 7 , 20 , 22 .…”

Section: Introductionmentioning

confidence: 99%

A comprehensive study on the microstructure evolution and oxidation resistance of conventional and nanocrystalline MCrAlY coatings

Ghadami

Rouhaghdam

Ghadami

2021

Sci Rep

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Conventional and nanocrystalline MCrAlY coatings were applied by the high-velocity oxy-fuel (HVOF) deposition process. The ball-milling method was used to prepare the nanocrystalline MCrAlY powder feedstock. The microstructure examinations of the conventional and nanocrystalline powders and coatings were performed using X-ray diffraction (XRD), high-resolution field emission scanning electron microscope (FESEM) equipped with energy-dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), and X-ray photoelectron spectroscopy (XPS). Williamson–Hall analyzing method was also used for estimation of the crystalline size and lattice strain of the as-milled powders and sprayed coatings. Owing to the investigation of the oxidation behavior, the freestanding coatings were subjected to isothermal and cyclic oxidation testing at 1000 and 1100 °C under static air. The results showed that the conventional as-sprayed MCrAlY coating had a parabolic behavior in the early stage and prolonged oxidation process. On the contrary, in the case of the nanocrystalline MCrAlY coating, the long-term oxidation behavior has deviated from parabolic to sub-parabolic rate law. Moreover, the results also exemplified that the nanocrystalline MCrAlY coating had a greater oxidation resistance following the creation of a continuous and slow-growing Al2O3 scale with a fine-grained structure. The nucleation and growth mechanisms of the oxides formed on the nanocrystalline coating have also been discussed in detail.

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Evaluation of Cyclic Oxidation and Hot Corrosion Behavior of HVOF-Sprayed WC-Co/NiCrAlY Coating

Cited by 24 publications

References 28 publications

Investigation of Hot Corrosion Behaviour of Uncoated and WC-17CO Coated Samples in Aggressive Molten Salt Environment

Investigation of Hot Corrosion Behaviour of Uncoated and WC-17CO Coated Samples in Aggressive Molten Salt Environment

Introducing New Coating Material Alloy with Potential Elements for High Corrosion Resistance for Oil and Gas Application

A comprehensive study on the microstructure evolution and oxidation resistance of conventional and nanocrystalline MCrAlY coatings

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