Effects of process current density and temperature on electrochemical boriding of steel in molten salts

Kartal, Gülşah Ekin; Timur, Servet; Arslan, Cüneyt

doi:10.1007/s11664-005-0162-x

Cited by 17 publications

(3 citation statements)

References 10 publications

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“…In this stage, the applied current was turned off and samples were left in the electrolyte without any polarization. The constant parameters taken in this study were initial optimized conditions reported by Kartal et al (Ref 14,27). A medium-frequency induction furnace (180 kHz, 5 kW, 7 A) was employed to heat the electrochemical cell which consists of graphite crucible as an anode and AISI 304L SS substrate as a cathode.…”

Section: Boriding Treatmentmentioning

confidence: 99%

Investigating Growth of Iron Borides with the Formation of Monolithic Fe2B Layer on AISI 304 Stainless Steel via Cathodic Reduction and Thermal Diffusion-Based Boriding

Arslan

Karimzadehkhoei

Sireli

et al. 2021

J. of Materi Eng and Perform

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This study is focused on the determination of the effects of processing time and temperature on the thickness, morphology, and hardness of boride layers grown on AISI 304L stainless steels. For boriding, a new molten salt electrolysis method called as CRTD-Bor (Cathodic Reduction and Thermal Diffusion-based boriding) was chosen due to its fast and green nature. CRTD-Bor of AISI 304L substrates was carried out in a borax-based molten electrolyte at temperatures ranging from 950 to 1050 °C for periods of 15 to 60 min at a constant current density of 200 mA/cm 2 . The x-ray diffraction analyses revealed the mixed iron boride phases including Fe 2 B, FeB. Moreover, cross-sectional scanning electron microscopy examinations confirmed the growth of these phases. Additionally, a phase homogenization (PH) step was adapted into CRTD-Bor to eliminate brittle FeB layer. It was founded that after 70 min of treatment at 1000 °C (15 min of CRTD-Bor + 55 min of PH) it is possible to grow % 40-lm-thick Fe 2 B layer exhibiting 1700 ± 100 HV on the surface with excellent adhesion to the substrate (HF1). Besides, kinetic calculations showed the activation energy (Q) of boride layer growth as 181.45 kJ/mol.

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Section: Boriding Treatmentmentioning

confidence: 99%

Investigating Growth of Iron Borides with the Formation of Monolithic Fe2B Layer on AISI 304 Stainless Steel via Cathodic Reduction and Thermal Diffusion-Based Boriding

Arslan

Karimzadehkhoei

Sireli

et al. 2021

J. of Materi Eng and Perform

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“…In light of our previous studies on molten salt electrolytes [33][34][35], certain amount of supplementary sodium carbonate (Na 2 CO 3 ) has a positive effect on the acceleration of boron reduction and diffusion rate; therefore, additional Na 2 CO 3 was also used in the borax based electrolyte. Cell potential with respect to electrolysis time (Fig.…”

Section: Ti þ B Ads ¼ Tib ð6þmentioning

confidence: 99%

Electrochemical boriding of titanium for improved mechanical properties

Kartal

Timur

Ürgen

et al. 2010

Surface and Coatings Technology

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“…They reported that the hardness of FeB was ~1800HV 0.1 and that of Fe 2 B was ~1200 HV0.1. Kartal et al [6] also reported a Na 2 B 4 O 7 -NaCl mixture, halogencontaining compounds (mainly KBF 4 ) and boron oxide (B 2 O 3 ) as electrolyte [7]. Currently, the main methods of obtaining materials of different functionality are the methods of physical and chemical vapor deposition, self-propagating high-temperature synthesis (SHS).…”

Section: Introductionmentioning

confidence: 99%

Increasing the Surface Hardness of Cast Iron by Electrodeposition of Borides in Molten Salts

Al-Azzawi¹,

Sytchev²,

Baumli³

2017

Archives of Metallurgy and Materials

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In this paper the electrodeposition of boron on the surface of cast iron as a coating is applied to increase the hardness and protect the substrate against abrasive wear. The boron containing coating was synthesized by electrodeposition process from a NaCl-KCl (1:1 mol)-10 w%NaF-10w% KBF 4 molten salt. The effect of electrolysis parameters (temperature and time) on the hardness is presented; the current density varied in the range -37 --4.5 mA/cm 2 , allowing perfect coverage of and respect for dimensions. The electrochemical process was carried out at different temperatures (750°C-900°C) and for different periods of time (5-10 hours). Depending on the current density and duration of electrolysis, the deposits consist of FeB or Fe 2 B. Microhardness measurements across the boride layer indicated very high hardness values (between 1600 and 2100 HV0.05).The structure of the boride layer is linked to its boron content and thermal history: as-deposited coatings present very small grain sizes and can be considered as nearly amorphous.

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Effects of process current density and temperature on electrochemical boriding of steel in molten salts

Cited by 17 publications

References 10 publications

Investigating Growth of Iron Borides with the Formation of Monolithic Fe2B Layer on AISI 304 Stainless Steel via Cathodic Reduction and Thermal Diffusion-Based Boriding

Investigating Growth of Iron Borides with the Formation of Monolithic Fe2B Layer on AISI 304 Stainless Steel via Cathodic Reduction and Thermal Diffusion-Based Boriding

Electrochemical boriding of titanium for improved mechanical properties

Increasing the Surface Hardness of Cast Iron by Electrodeposition of Borides in Molten Salts

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