Corrosion resistance and characterization of metallic coatings deposited by thermal spray on carbon steel

Brito, Vânia; Bastos, Ivan Napoleão; Costa, Hector Reynaldo Meneses

doi:10.1016/j.matdes.2012.05.008

Cited by 87 publications

(36 citation statements)

References 24 publications

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“…The heat source can be a fuel gas or an electric arc. After the melt, the atomized material is accelerated by pressure gas against the surface to be coated, reaching it in the melted state [11]. Twin wire arc spraying (TWAS) is one of the thermal spray application method which has several advantages in simplicity of process, low operational cost and high efficiency [4,6,8], but TWAS produce high porosity in coating layer that result a decreasing cohesive and adhesive strength.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Adhesion Properties Post-Annealed Metallic Coating of Fecrbmnsi on Tube and Internal Structure Coal-Fired Boiler

Purniawan

Irawan

Wicaksono

2017

IJPS

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Iron-chrome based metallic coating is generally used to increase the life-time tube and internal structure of coalfired boiler. The most common method used is thermal spray coating. The advantages of this method are simple in application, repair, and low cost. The post-heat treatment coating on metallic coating applied by the thermal spray method can affect to adhesion properties, the number of porosity and microstructure of coating material. The objective of this study is to analyze the influence of post-annealing on the metallic coating FeCrBMnSi applied by Twin Wire Arc-Spraying (TWAS) method on microstructure and adhesion properties which is applied on tube and internal structure of coal-fired boiler. Post-annealing was performed after coating application in vacuum furnace with variety of temperature at 500 o C, 600 o C and 700 o and holding time about 3 hours. Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectroscopy (EDS) were used to analyze the morphology of microstructure, the uniformity of the deposit layer, and the percentage of porosity. X-Ray Diffraction (XRD) was used to determine phase formation and composition phase. Then, Pull Off Test was performed for adhesion test that is referred to ASTM D4541. The results shows that increasing postannealed temperature cause microstructure of coating more crystalline, percentage of porosity decreased from 3% Assprayed to 1,4% at 700 o C post-annealing temperature and it has an effect on the adhesion properties of coating which increase up to 25%.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Adhesion Properties Post-Annealed Metallic Coating of Fecrbmnsi on Tube and Internal Structure Coal-Fired Boiler

Purniawan

Irawan

Wicaksono

2017

IJPS

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“…Therefore, the development of new materials and technologies capable of meeting the requirements for the installation of extraction systems, conditioning and transport of oil and natural gas, with high resistance to attack by aggressive substances, has become increasingly necessary. These issues have come to represent the technological bottlenecks currently encountered in the sector 2,3 . Among the available alternatives for metal surface protection in aggressive environments, such as the marine environment, the thermal spray process has been widely researched and used in recent years 1,2,4,5 .…”

Section: Introductionmentioning

confidence: 99%

“…Among the available alternatives for metal surface protection in aggressive environments, such as the marine environment, the thermal spray process has been widely researched and used in recent years 1,2,4,5 . Thermal spraying represents a range of techniques employed to obtain coatings that promote corrosion and wear resistance improvements in components [6][7][8][9][10][11] at lower costs than other processes 1,2 . In this process, a powder material is sprayed, melted or semi-melted by heat generated in the nozzle of a spray torch 5,6 .…”

Section: Introductionmentioning

confidence: 99%

“…In this process, a powder material is sprayed, melted or semi-melted by heat generated in the nozzle of a spray torch 5,6 . After fusion, the material is projected against the surface to be coated, resulting in a layered structure consisting of flattened particles in the direction parallel to the substrate surface, containing, oxide inclusions, voids and porosity 1,2 . Thermal spraying techniques are subdivided in several types based on the material to be applied to the heating source and the method of accelerating particles towards the substrate 12 .…”

Section: Introductionmentioning

confidence: 99%

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Niobium and niobium-iron coatings on API 5LX 70 steel applied with HVOF

et al. 2014

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The present study aimed to create and characterize niobium and niobium-iron60% coatings applied to steel API 5L X70 using the hypersonic thermal spray process (HVOF). The morphologies of the coatings were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and profilometry, while the coatings' hardnesses was evaluated using the Vickers hardness test. The coatings' corrosion resistance was evaluated by monitoring their open circuit potential and potentiodynamic polarization and performing electrochemical impedance spectroscopy in a 0.05 M NaCl solution. The results showed that the niobium-iron coating contained minor porosity regions, while such defects occurred over large regions of the niobium coating. In terms of corrosion resistance, the coatings obtained in this work promoted a reduction in the substrate's corrosion rate, but the presence of discontinuities such as porosity compromised the barrier effects of these coatings.

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“…Therefore, offshore industry has increased the use of thermal spray as a method to protect the mechanical parts of equipments against corrosion and wear. For this purpose, wire arc spraying is used because of its simplicity, low operation cost and high efficiency [10].…”

Section: Introductionmentioning

confidence: 99%

Characterization of FeCr and FeCoCr alloy coatings of carbon steels for marine environment applications

2013

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This paper presents the adhesive strength results of FeCr and FeCoCr deposits produced by electric arc thermal spray process on carbon steel plates. Five chemical compositions were tested to give a large panel of possibility. Coatings were characterized by several methods to result in a performance screening. The main assessment of microstructural morphology was made by scanning electron microscopy (SEM). The mechanical strength of coatings was evaluated by standard pull-off test. The corrosion resistance was analyzed in salt-spray test. The morphology of coatings exhibits characteristics of lamellar microstructures with incompletely melted particles together with a distribution of similarly oriented oxides. The adhesive strength of FeCoCr alloy coatings was higher amongst all studied conditions. All sealed conditions presented low corrosion in salt-spray exposure. Additionally, a new FeCoCr alloy was studied to reduce pores and microcracks that are frequently found in traditional FeCr and FeCrNi alloys. Based on the performed characterizations, the findings suggested that the FeCoCr deposition, with an epoxy sealing, is suitable to be used as an efficient coating of carbon steel in aggressive marine environments.

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Corrosion resistance and characterization of metallic coatings deposited by thermal spray on carbon steel

Cited by 87 publications

References 24 publications

Microstructure and Adhesion Properties Post-Annealed Metallic Coating of Fecrbmnsi on Tube and Internal Structure Coal-Fired Boiler

Microstructure and Adhesion Properties Post-Annealed Metallic Coating of Fecrbmnsi on Tube and Internal Structure Coal-Fired Boiler

Niobium and niobium-iron coatings on API 5LX 70 steel applied with HVOF

Characterization of FeCr and FeCoCr alloy coatings of carbon steels for marine environment applications

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