An electrochemical study of the corrosion resistance of boride coating obtained by thermo-reactive diffusion

Tavakoli, Hossein; Khoie, S.M. Mousavi

doi:10.1016/j.matchemphys.2010.08.047

Cited by 57 publications

(22 citation statements)

References 20 publications

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“…The corrosion of borided steels has not yet been explored extensively; only a few studies have been reported [14][15][16][17]. Also, there is no information about the corrosion behavior of borided cold work tool steels.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Behavior and Microstructure of Borided Tool Steel

Erdoğan

Güneş

2015

Matéria (Rio J.)

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In the present study, the corrosion behaviors of borides formed on cold work tool steel have been investigated in a 4% M HCl acid solution. Boriding was performed in a solid medium consisting of Ekabor-II powders at 850 and 950°C for 6 h. The boride layer was characterized by SEM, EDS, XRD and the hardness tester. XRD analysis of boride layers on the surface of the samples revealed the existence of FeB, Fe2B, CrB, Cr2B and MoB compounds. Depending on the chemical composition of substrates and boriding time, the boride layer thickness on the surface of the steel ranged from 13.14 μm and 120.82 μm. The hardness of the boride compounds formed on the surface of the samples ranged from 1806 to 2342 HV0,05, whereas Vickers hardness values of the untreated the samples was 428 HV0,05. The corrosion resistance of the borided steels was higher compared with that of the unborided steels. The borided steels increased the corrosion resistances of the steels 8-17-fold.

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Section: Introductionmentioning

confidence: 99%

Corrosion Behavior and Microstructure of Borided Tool Steel

Erdoğan

Güneş

2015

Matéria (Rio J.)

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“…These papers reported the growth kinetics of binary systems such as NbC or VC, in which the layer thickness is studied as a function of time and temperature of treatment. In the electrochemical field, there are studies of iron boride on AISI S1, S2, and S3, varying the manganese content [9]. However, to the authors' knowledge, a microstructural and electrochemical study of the possible ternary system (NbVC 2 ) has not been reported, as proposed in the present paper.…”

Section: Introductionmentioning

confidence: 83%

“…This probably occurs because increasing the immersion time increases the area of the pores, and thus there is greater penetration into the corrosive solution, which produces steel pitting corrosion; however, these results indicated that the time required for the electrolyte to penetrate the finer defects such as micro-cracks is of the order of 24 h [9,[20][21].…”

Section: Electrochemical Performancementioning

confidence: 90%

Electrochemical and wear behavior of niobium-vanadium carbide coatings produced on AISI H13 tool steel through thermo-reactive deposition/diffusion

Castillejo

Flórez

Orjuela

2016

Ingeniare. Rev. chil. ing.

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We deposited of niobium-vanadium carbide coatings on tool steel AISI H13 using the thermo-reactive substrates deposition/diffusion (TRD) technique. The carbides were obtained using salt baths composed of molten borax, ferroniobium, vanadium and aluminum, by heating this mixture at 1020° C for 4 hours. The coatings were characterized morphologically via electron microscopy scanning (SEM), the chemical surface composition was determined through X-ray photoelectron spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDX); the crystal structure was analyzed using x-ray diffraction (XRD), the mechanical properties of the coatings were evaluated using nano-indentation, The tribological properties of the coatings obtained were determined using a Pin-on-disk tribometer and the electrochemical behavior was studied through potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). The results showed that the hardness of the coated steel increased four times with respect to uncoated steel, and the electrochemical test established that the corrosion current is lower by one order of magnitude for coated steel.Keywords: Coatings, thermo reactive, niobium-vanadium carbide, spectroscopy, impedance. RESUMEN En este trabajo se depositaron recubrimientos de carburo de niobio-vanadio sobre aceros para herramientas AISI H13 utilizando la técnica de depósito por difusión termorreactiva (TRD). Los carburos se obtuvieron utilizando baños de sales compuestas de bórax fundido, ferroniobio, vanadio y aluminio, calentando la mezcla a 1020 °C durante 4 horas. Los recubrimientos fueron caracterizados morfológicamente mediante microscopia electrónica de barrido (SEM), la composición química de la superficie se determinó mediante espectroscopia de fotoelectrones de rayos X (XPS) y la espectroscopia de rayos X de energía dispersiva (EDX); la estructura cristalina se analizó utilizando difracción de rayos X (XRD), las propiedades mecánicas de los recubrimientos fueron evaluados utilizando nanoindentación. Las propiedades tribológicas de los recubrimientos obtenidos fueron determinadas usando un tribómetro Pin on Disk CETR-UMC-2 y el comportamiento electroquímico se estudió por medio de curvas de polarización potenciodinámica y espectroscopia de impedancia electroquímica (EIS). Los resultados mostraron que la dureza del acero revestido aumentó cuatro veces respecto del acero no recubierto, y la prueba electroquímica estableció que la corriente de corrosión es inferior en un orden de magnitud para el acero recubierto.Palabras clave: Recubrimientos, termorreactiva, carburo de niobio-vanadio, espectroscopia, impedancia.

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“…Boron atoms have relatively small size and high mobility; therefore, they can easily diffuse into ferrous alloys, forming FeB and Fe 2 B intermetallics [4]. According to the boron-iron phase diagram, maximum amount of boron that can form a single-phase Fe 2 B is 33.5 at.% [5].…”

Section: Introductionmentioning

confidence: 99%