Corrosion resistance of Ni‐50Cr HVOF coatings on 310S alloy substrates in a metal dusting atmosphere

Saaedi, J.; Arabi, H.; Coyle, Thomas W.; Mirdamadi, Sh.; Ghorbani, Hamzeh

doi:10.1002/maco.200905536

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…This case is also proved by recent studies in the AMCs that the thicker coating is more effective in hindering the occurrence of through‐pores, resulting in its enhanced corrosion resistance 12. Herein, it should be pointed out that the coating thickness needs a balance since too thick coating holds much more unfavorable defects and lower interfacial strength with the substrate 21.…”

Section: Discussionmentioning

confidence: 99%

Corrosion of high‐velocity oxy‐fuel (HVOF) sprayed iron‐based amorphous metallic coatings for marine pump in sodium chloride solutions

Wang

et al. 2011

Materials & Corrosion

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FeCrMoMnWBCSi amorphous metallic coatings (AMCs) were deposited onto the 304 stainless steel (base material of pump impeller operated in sand‐containing seawater) by high‐velocity oxygen‐fuel (HVOF) thermal spray. The preparation, microstructural characteristics, and static corrosion behavior of the AMCs were presented. The microstructure and corrosion behavior of the AMCs were characterized by scanning electron microscopy (SEM), X‐ray diffraction (XRD), differential scanning calorimetry (DSC), and electrochemical methods. Melt‐spun ribbon and 304 stainless steel were also used for comparison purposes. The results indicated that the AMCs can spontaneously passivate with a wide passive region, and much higher ability to withstand pitting corrosion than that of the 304 stainless steel for the high pitting resistance equivalent value. The passive current density of the AMCs was at least two orders of magnitude higher than the counterpart ribbon, which showed a slightly decreased uniform corrosion resistance of the AMCs due to the incompact structure and porosity. The corrosion resistance of the AMCs increased with the coating thickness and decreased with the concentration of NaCl solution. A stable passivation ability held in the AMCs endowed them suitably used in marine environments.

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Section: Discussionmentioning

confidence: 99%

Corrosion of high‐velocity oxy‐fuel (HVOF) sprayed iron‐based amorphous metallic coatings for marine pump in sodium chloride solutions

Wang

et al. 2011

Materials & Corrosion

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“…The studies of nickel and cobalt HVOF coatings associated with other elements have been reported extensively in literature regarding corrosion resistance improvement [28][29][30][31][32][33], hot corrosion [34,35], and corrosion associated with wear and erosion phenomena [36][37][38], however, the study of pure nickel and pure cobalt coatings obtained by HVOF has not been studied.…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of nickel and cobalt coatings obtained by high‐velocity oxy‐fuel (HVOF) thermal spraying on API 5CT P110 steel

Brandolt

Ortega-Vega

Menezes

et al. 2015

Materials & Corrosion

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The API 5CT P110 steel is employed in oil and gas industry due to its excellent mechanical properties. However, its poor corrosion resistance makes necessary the employment of a protection. Although nickel-based and cobalt-based coatings obtained by HVOF have been widely studied regarding corrosion resistance, they are normally associated with other elements. Pure nickel and/or pure cobalt HVOFobtained coatings have not yet been studied.Therefore, in this work, the corrosion resistance of nickel and cobalt coatings obtained by high-velocity oxy-fuel thermal spraying on API 5CT P110 steel was evaluated. The coatings were characterized regarding morphology and structure by SEM, EDS, XRD, roughness, and Vickers microhardness. The corrosion resistance was evaluated by OCP monitoring and potentiodynamic polarization in a 3.5 wt% sodium chloride solution. The results showed that both coatings acted as a barrier and avoided the contact between the steel substrate and the electrolyte due to the low melting point of the metals employed, which resulted in effective fusion of the particles. Besides, the nickel coating, promoted a better corrosion resistance compared to cobalt coating.

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“…Different coatings have been applied in order to avoid or suppress metal dusting [8][9][10]. However, the protection is only guaranteed, if the coatings are free of defects and pores because metal dusting may start from defects in the coatings [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Si-Content on the High Temperature Oxidation Behaviour of NiCrBSi-Coatings

Strübbe

Mărginean

Şerban

2014

SSP

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The high temperature oxidation behaviour of Ni-Cr-B-Si coatings with a higher Si-content was investigated in order to evaluate the suitability of such materials especially for novel applications concerning highly aggressive environments like metal dusting. Metal dusting is a corrosion phenomenon that occurs in reducing-, carbon-supersaturated (ac>1) gaseous atmosphere, containing CO, H2, CO2 and H2O, at elevated temperatures between 400 and 800°C. Metal dusting reactions can be classified into two types. The first one concerns Fe-alloys, where Fe3C is growing on the surface. The second one is related to the reaction of Ni, Co and their alloys, where the destruction takes place through inward growth or direct ingrowth of graphite, without forming the metastable Fe3C. Regarding to the literature, metal dusting is typically encountered in industrial furnaces, but mainly in the chemical or petrochemical industry. The way to suppress metal dusting is to stop the dissociation of the carbon source or to stop the carbon ingress in the material. One possibility in order to avoid the carburization of Fe, Ni, Co and their alloys is to preoxidize the samples. Based on the reducing atmosphere, where metal dusting occurs, the isothermal outsourcing for the formation of a protective Al-, Cr- or Si-oxide layer on the samples in air is mostly necessary. The role of a stable Al2O3 and Cr2O3-layer on the sample as a diffusion barrier against the carbon ingress, based on their low solubility for carbon, has already been investigated and proved by many scientists. The formation of a protective and thermodynamically very stable SiO2 scale was also investigated. Within the scope of this work, the influence of a higher Si-content (4,5 wt%) in NiCrBSi-alloys, depending on the temperature, was analyzed. For this purpose the samples were oxidized in air at 600, 700 and 800°C respectively. The surface morphology and the phase composition of the grown oxide scales were characterized by means of scanning electron microscopy combined with energy dispersive X-ray (SEM/EDX) and by X-ray diffraction (XRD) technique. The experimental results demonstrate the importance of silicon content on the coatings properties, respectively on the stability of the formed oxide scale (free of micro cracks, no spallation). This element is able to form beside chromium, a dense oxide layer on the sample surface, protecting it against further degradation induced by the atmosphere in different high temperature applications. Moreover, the increased chromium content of the feedstock powder (from 10 wt% in previous work to 12,5 wt%) demonstrated that the Ni-Cr-B-Si coatings exposed at 600°C, 700°C as well as at 800°C were not susceptible to internal oxidation.

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Corrosion resistance of Ni‐50Cr HVOF coatings on 310S alloy substrates in a metal dusting atmosphere

Cited by 5 publications

References 22 publications

Corrosion of high‐velocity oxy‐fuel (HVOF) sprayed iron‐based amorphous metallic coatings for marine pump in sodium chloride solutions

Corrosion of high‐velocity oxy‐fuel (HVOF) sprayed iron‐based amorphous metallic coatings for marine pump in sodium chloride solutions

Corrosion behavior of nickel and cobalt coatings obtained by high‐velocity oxy‐fuel (HVOF) thermal spraying on API 5CT P110 steel

Influence of the Si-Content on the High Temperature Oxidation Behaviour of NiCrBSi-Coatings

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