Microstructure and corrosion behavior of Fe-based amorphous coating prepared by HVOF

Zhang, Jifu; Liu, Min; Song, Jinbing; Deng, Chunming; Deng, Chunmei

doi:10.1016/j.jallcom.2017.06.046

Cited by 59 publications

(29 citation statements)

References 12 publications

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“…The diffusion peak intensity of the amorphous/nanocrystalline coating deposited by HVOF was significantly enhanced compared to the amorphous powder, but there was still no crystallization peak phenomenon ( Figure 1b). Previous research [24] shows that the microstructure of the HVOF-deposited coating was amorphous + nanocrystalline, so the diffusion peak at 2θ = 44 • was the diffraction from the nanocrystalline in the coating. Moreover, the XRD diffraction spectrum of the coating after heat treatment at 650 • C was still a diffuse peak, which means that the crystallization or nanocrystalline growth of the amorphous coating was not significant (Figure 1c).…”

Section: Test Methodsmentioning

confidence: 92%

“…However, the surface morphology of Fe-based amorphous/nanocrystalline coating did not show any obvious corrosion holes or corrosion cracks; it was similar to its morphology before the testing (Figure 3c). Therefore, it can be deduced that the amorphous/nanocrystalline structure [24] of Fe-based coating makes chemical inhomogeneity and microscopic defects less probable; this can effectively reduce the possibility of localized galvanic corrosion. Therefore, the Fe-based amorphous/nanocrystalline coating exhibited better resistance to localized corrosion in NaCl solution than 304 stainless steel and Cr plating.…”

Section: Test Methodsmentioning

confidence: 99%

“…They can be successfully coated on steel substrate by thermal spray technology [10][11][12][13][14], where the amorphous structure is retained due to sufficiently rapid cooling that prevents long-range diffusion and crystallization. These advantages have demonstrated an enhanced comprehensive performance on steel surfaces in industrial applications, such as a better corrosion resistance than electroplated Cr and stainless steel in NaCl solution [15,16].Many scholars have researched the corrosion behavior of amorphous coatings [17][18][19][20][21][22][23][24][25][26]. For example, M.S.…”

mentioning

confidence: 99%

“…Many scholars have researched the corrosion behavior of amorphous coatings [17][18][19][20][21][22][23][24][25][26]. For example, M.S.…”

mentioning

confidence: 99%

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Electrochemical Corrosive Behaviors of Fe-Based Amorphous/Nanocrystalline Coating on Stainless Steel Prepared by HVOF-Sprayed

et al. 2019

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In this study, FeCrMnWMoSi amorphous/nanocrystalline coating was prepared on stainless steel by high-velocity oxygen fuel (HVOF) spraying. In order to thoroughly evaluate this novel material, the corrosion behaviors and corrosive film characteristics of the amorphous/nanocrystalline coating in NaCl corrosive media were studied using electrochemical measurement technologies such as potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). It was found that the corrosion resistance of Fe-based amorphous/nanocrystalline coating could be attributed to the passive film formed, which consisted of Fe, Cr, Mo, and W oxides. pH has an important influence on the corrosion resistance of amorphous/nanocrystalline coating by changing the pitting corrosion mechanism. Under neutral and acidic conditions, the corrosion mechanism of Fe-based amorphous/nanocrystalline coating was mainly local pitting corrosion. However, under strong alkaline conditions, the amorphous/nanocrystalline coating not only had pitting corrosion, but also had the active dissolution of the passive film. Therefore, the anti-corrosion performance of Fe-based amorphous/nanocrystalline coating under alkaline conditions was not as good as neutral and acidic corrosive medium.Compared with crystalline alloys and stainless steels of the same composition, amorphous alloys have excellent wear and corrosion resistance, so they are ideal coating materials for applications in marine and industrial fields [3,4]. For example, in the power industry, boiler pipes, steam turbine rotating shafts, blades, valve elbows, and other key components are subject to severe wear, corrosion, or erosion, which poses safety hazards to the long-term operation of power station equipment [5]. The application of amorphous coatings to protect the surface of these components is an effective technical method to solve those problems. Amorphous coatings also have huge application prospects for protection of steel facilities (such as television towers, bridges, road facilities, floodgates, microwave towers, high-voltage transmission towers, underground cable supports, and even transportation and underground storage of nuclear waste) from long-term exposure to harsh outdoor environments [6]. Among those amorphous alloy materials, Fe-based amorphous alloys are the most attractive due to their unique properties including high hardness, superior corrosion and wear resistance, and relatively low cost [7][8][9]. They can be successfully coated on steel substrate by thermal spray technology [10][11][12][13][14], where the amorphous structure is retained due to sufficiently rapid cooling that prevents long-range diffusion and crystallization. These advantages have demonstrated an enhanced comprehensive performance on steel surfaces in industrial applications, such as a better corrosion resistance than electroplated Cr and stainless steel in NaCl solution [15,16].Many scholars have researched the corrosion behavior of amorphous coatings [17][18][19][20][21][22][23][24][25][26]. ...

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Section: Test Methodsmentioning

confidence: 92%

Section: Test Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

“…Many scholars have researched the corrosion behavior of amorphous coatings [17][18][19][20][21][22][23][24][25][26]. For example, M.S.…”

mentioning

confidence: 99%

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Electrochemical Corrosive Behaviors of Fe-Based Amorphous/Nanocrystalline Coating on Stainless Steel Prepared by HVOF-Sprayed

et al. 2019

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“…Therefore, LR is one of the most effective ways to improve the corrosion resistance of arc-sprayed Al coatings. The corrosion resistance of metallic glasses is influenced by the element composition, the corrosion resistance mechanism of metallic glass composites need further research [23,24]. Ti and Ni particles incorporated into a coating can offer optimized protection and improve the microstructure of composite coating.…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Remelting Power on Immersion Corrosion of Amorphous Al–Ti–Ni Coatings

Chen

Dejun

2018

Coatings

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An arc-sprayed amorphous Al-Ti-Ni coating on S355 structural steel was processed by laser remelting (LR) at powers of 600, 800, and 1000 W. The surface-cross-sectional morphologies, chemical element distributions, and phase compositions of the as-obtained Al-Ti-Ni coatings were analyzed using a scanning electron microscope (SEM), energy-dispersive spectrometer (EDS), and X-ray diffractometer (XRD), respectively. The immersion corrosion tests of Al-Ti-Ni coatings in 3.5% NaCl solution for 720 h were performed to investigate the effects of LR power on their immersion corrosion behaviors. The test results show that the amorphous Al-Ti-Ni coatings form good metallurgical bonding with the substrate after LR. The AlNi, Al 3 Ti, Al 3 Ni 2 , Ti 3 O 5 , and Al 2 O 3 amorphous phases are detected in the Al-Ti-Ni coatings after LR. The corrosion potentials of Al-Ti-Ni coatings after LR show a positive shift relative to that of S355 steel, implying that the corrosion resistance of Al-Ti-Ni coatings was superior to that of S355 steel. A dense protective Al 2 O 3 film is formed on the Al-Ti-Ni coating surface at an LR power of 1000 W, at which power the highest corrosion potential of −0.233 V is observed. The corrosion mechanisms of Al-Ti-Ni coating at the LR power of 1000 W are uniform corrosion and pitting corrosion, while those of Al-Ti-Ni coatings at the LR powers of 600 and 800 W are localized corrosion and pitting corrosion. The corrosion resistance of Al-Ti-Ni coating with the LR power of 1000 W is better than those at the LR powers of 600 and 800 W, effectively improving the corrosion resistance of S355 steel.

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A Review on High Entropy Alloys Coatings: Fabrication Processes and Property Assessment

et al. 2019

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Surface coatings can enhance the mechanical and functional properties of substrates and keep good balance between specific mechanical properties and sufficient surface performance of the components. Coatings composed of high entropy alloys (HEAs) and HEA‐based materials, including metallic, ceramics, and composites have attracted the global attention and developed rapidly over the last decade, owing to their outstanding properties. Here, the authors provide a critical review of the state‐of‐the‐art for HEA‐based coatings, aiming to address the related conceptions, designing principles, microstructural, and mechanical evolutions during fabrication and post‐treatments process. The surface properties which are not limited to anti‐corrosion, anti‐radiation, and anti‐diffusion and their underlying mechanisms are analyzed. The development tendency and future applications are classified and discussed, including the basic researches about HEAs, the regulations of fabrication techniques and the exploring of functional properties of HEA‐based coatings. Due to their superior mechanical and functional potentials as well as abundant element‐constitutions of designing, surface coatings composed of HEA‐based materials are considered to have promising applications in engineering and industrial manufacturing.

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Microstructure and corrosion behavior of Fe-based amorphous coating prepared by HVOF

Cited by 59 publications

References 12 publications

Electrochemical Corrosive Behaviors of Fe-Based Amorphous/Nanocrystalline Coating on Stainless Steel Prepared by HVOF-Sprayed

Electrochemical Corrosive Behaviors of Fe-Based Amorphous/Nanocrystalline Coating on Stainless Steel Prepared by HVOF-Sprayed

Effect of Laser Remelting Power on Immersion Corrosion of Amorphous Al–Ti–Ni Coatings

A Review on High Entropy Alloys Coatings: Fabrication Processes and Property Assessment

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