Ni20Cr coating on T24 steel pipes by HVOF thermal spray for high temperature protection

Abu-warda, N.; López, A.J.; López, María Dolores; Utrilla, M. V.

doi:10.1016/j.surfcoat.2019.125133

Cited by 22 publications

(14 citation statements)

References 20 publications

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“…1 shows a cross-section of the HVOF Ni20Cr coating on a T24 ferritic-martensitic steel. Their full characterization was previously reported in [19]. In essence, the steel has a ferritic-martensitic microstructure with an average grain size of 14 µm while the coating is homogeneous, well adhered to the substrate (29 ± 7 MPa) and fully dense with very low porosity (<1 vol%) and high micro-hardness (460 ± 30 HV0.1).…”

Section: Characterization Of the Starting Materialsmentioning

confidence: 90%

“…The external surface of steel pipes was sandblasted with 1 mm diameter alumina particles to increase surface roughness before the deposition of the Ni20Cr alloy coating by HVOF technique. The optimization of HVOF thermal spray process was performed in a previous study [19].…”

Section: Methodsmentioning

confidence: 99%

“…In essence, the steel has a ferritic-martensitic microstructure with an average grain size of 14 µm while the coating is homogeneous, well adhered to the substrate (29 ± 7 MPa) and fully dense with very low porosity (<1 vol%) and high micro-hardness (460 ± 30 HV0.1). In addition, it shows a low oxide content (4 ± 1 vol%) and presents an average minimum thickness of 260 ± 20 µm [19]. in T24 steel would follow the sequence S0 ≈ S4 < S2 ≈ S3 < S1.…”

Section: Characterization Of the Starting Materialsmentioning

confidence: 99%

“…The high temperature corrosion resistance of the NiCr-coated and the uncoated T24 steel exposed to air at 650 °C for 360 h was analyzed in detail in a previous study [19]. The uncoated steel grew a non-protective oxide layer composed of an inner layer of Fe3O4 and an outer scale of Fe2O3 of around 120 μm.…”

Section: Samples Without Saltsmentioning

confidence: 99%

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Fireside corrosion on T24 steel pipes and HVOF NiCr coatings exposed to different salt mixtures

et al. 2020

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Fireside corrosion of T24 steel and HVOF NiCr-coated counterparts is investigated. The samples were exposed to different deposits of NaCl, KCl, Na2SO4 and K2SO4 at 650 ºC for 360 h in dry air. The deposit with the highest chloride content (NaCl-KCl) was the most aggressive followed by the ones combining chlorides and sulfates. In contrast, the sulfate-based salts did not produce severe damage. The NiCr coating maintained the integrity of the substrate but the chlorides induced a great attack on the coating. The formation of K2CrO4 and the penetration of chlorides are identified as the main factors of this attack.

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Section: Characterization Of the Starting Materialsmentioning

confidence: 90%

Section: Methodsmentioning

confidence: 99%

Section: Characterization Of the Starting Materialsmentioning

confidence: 99%

Section: Samples Without Saltsmentioning

confidence: 99%

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Fireside corrosion on T24 steel pipes and HVOF NiCr coatings exposed to different salt mixtures

et al. 2020

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“…2 However, the performance of the HVOF coatings is highly sensitive to the spray process parameters. 3 Therefore, the determination of optimal spray parameter values is critical for obtaining superior coating properties, and has attracted significant attention from researchers. Among the optimization techniques, the design of experiments (DOE) using the Taguchi approach is fairly effective for finding the optimal process parameters for many industrial implementations, including the thermal spray process.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization of WC-12Co coating by high-velocity oxygen fuel spray using multiple regression-based weighted signal-to-noise ratio

Nguyen

Doan

Tong

2021

Proceedings of the Institution of Mechanical Engineers, Part B:

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In this study, the optimal process parameters for a high-velocity oxygen fuel spray, which was used to deposit WC-12Co coating on a 16Mn steel substrate, were studied to simultaneously improve the microhardness, adhesion strength, and porosity of the coating. To this end, trial tests were conducted to determine the feasible ranges of the spray parameters: powder feed rate ( A), spray distance ( B), and oxygen/propane mixture ratio ( C). Taguchi orthogonal array (L9) experimental design was used to determine regression formulae for the microhardness, adhesion strength, and porosity. Then, based on a method using the multiple regression-based weighted signal-to-noise ratio, the optimal spray parameters were identified. To verify the optimization results, confirmation experiments were carried out. An analysis of variance was also conducted to check the proportion of contribution of the spray parameters on the output quality characteristics. The confirmation test results proved that the predicted and measured results were in good agreement. The optimal conditions of the high-velocity oxygen fuel spray were: A = 32 g/min, B = 0.35 m, and C = 5. The estimated optimal coating properties were: microhardness = 1335.784 HV, adhesion strength = 64.659 MPa, and porosity = 1.797%. The oxygen/propane ratio showed the highest contribution to the microhardness, whereas the most influential factor for both adhesion strength and porosity was the spraying distance.

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Corrosion behavior of T24, T92, VM12, and AISI 304 steels exposed to KCl–NaCl–K₂SO₄–Na₂SO₄ salt mixtures

Abu-warda

López

Pedraza

et al. 2020

Materials & Corrosion

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The corrosion mechanisms of T24, T92, VM12, and AISI 304 steels are studied under the influence of NaCl–KCl, NaCl–Na2SO4, and KCl–K2SO4 salt mixtures in a dry air atmosphere at 650°C for 15 days. NaCl–KCl was the most aggressive deposit and AISI 304 stainless steel exhibited the highest corrosion resistance. There was no relation between the Cr content of the ferritic steels and their corrosion resistance in NaCl–KCl. In contrast, the resistance of high‐Cr steels was better when exposed to NaCl–Na2SO4 and KCl–K2SO4. The high‐Cr and the low‐Cr steels were more susceptible to NaCl–Na2SO4 and to KCl–K2SO4, respectively.

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Ni20Cr coating on T24 steel pipes by HVOF thermal spray for high temperature protection

Cited by 22 publications

References 20 publications

Fireside corrosion on T24 steel pipes and HVOF NiCr coatings exposed to different salt mixtures

Fireside corrosion on T24 steel pipes and HVOF NiCr coatings exposed to different salt mixtures

Multi-objective optimization of WC-12Co coating by high-velocity oxygen fuel spray using multiple regression-based weighted signal-to-noise ratio

Corrosion behavior of T24, T92, VM12, and AISI 304 steels exposed to KCl–NaCl–K₂SO₄–Na₂SO₄ salt mixtures

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Ni20Cr coating on T24 steel pipes by HVOF thermal spray for high temperature protection

Cited by 22 publications

References 20 publications

Fireside corrosion on T24 steel pipes and HVOF NiCr coatings exposed to different salt mixtures

Fireside corrosion on T24 steel pipes and HVOF NiCr coatings exposed to different salt mixtures

Multi-objective optimization of WC-12Co coating by high-velocity oxygen fuel spray using multiple regression-based weighted signal-to-noise ratio

Corrosion behavior of T24, T92, VM12, and AISI 304 steels exposed to KCl–NaCl–K2SO4–Na2SO4 salt mixtures

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Product

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Corrosion behavior of T24, T92, VM12, and AISI 304 steels exposed to KCl–NaCl–K₂SO₄–Na₂SO₄ salt mixtures