Investigating the morphology and corrosion behavior of electrochemically borided steel

Gu Kartal; O. Kahvecioglu; S. Timur

doi:10.1016/j.surfcoat.2005.02.210

Investigating the morphology and corrosion behavior of electrochemically borided steel

Gu Kartal^*, O. Kahvecioglu, S. Timur

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Istanbul Technical University

Research output: Contribution to journal › Article › peer-review

50 Citations (Scopus)

Abstract

In this study, the boriding of steels by molten salt electrolysis in borax-based electrolyte at various current densities (50-700 mA/cm²), temperatures (800-1000 °C), and time (0-2 h) was investigated. The optimum condition was determined by taking the thickness, hardness, and morphology of the boride layer into account. Different borided phases can form depending on the amount of the diffused boron from surface to matrix as follows: FeB_x(x > 1) ⇒ FeB ⇒ Fe₂B ⇒ Fe₃B ⇒ Fe_yB(y > 3) ⇒ Fe. Determination of the optimum conditions for the boriding of DIN EN 10130-99 DC04 low carbon steel are; 10% Na₂CO₃ + 90% Na₂B₄ O₇, 900 °C, 1 h, and 200 mA/cm². The corrosion tests for the given material were carried out in different media; HCl, H₂SO₄, HNO₃, H₃ PO₄, and HClO₄ (10%, vol.). Electrochemically borided low carbon steel showed a corrosion rate of 0.66 × 10^-3 g/cm²/day in HCl, 1.13 × 10^-3 g/cm²/day in H₂SO₄, 1.59 × 10^-3 g/cm²/day in HClO₄, and 3.37 × 10^-3 g/cm²/day in H₃ PO₄. However, it was not resistant to HNO₃ with a considerable corrosion rate of 0.3 g/cm²/day.

Original language	English
Pages (from-to)	3590-3593
Number of pages	4
Journal	Surface and Coatings Technology
Volume	200
Issue number	11
DOIs	https://doi.org/10.1016/j.surfcoat.2005.02.210
Publication status	Published - 15 Mar 2006

Funding

The authors are pleased to acknowledge the support given by T.R. Prime Ministry The State Planning Organization through the Advanced Technologies in Engineering project in Istanbul Technical University.

Funders	Funder number
T.R. Prime Ministry The State Planning Organization
Istanbul Teknik Üniversitesi

Keywords

Corrosion
Electrochemical boriding
FeB
Molten salt
Surface treatment

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10.1016/j.surfcoat.2005.02.210

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title = "Investigating the morphology and corrosion behavior of electrochemically borided steel",

abstract = "In this study, the boriding of steels by molten salt electrolysis in borax-based electrolyte at various current densities (50-700 mA/cm2), temperatures (800-1000 °C), and time (0-2 h) was investigated. The optimum condition was determined by taking the thickness, hardness, and morphology of the boride layer into account. Different borided phases can form depending on the amount of the diffused boron from surface to matrix as follows: FeBx(x > 1) ⇒ FeB ⇒ Fe2B ⇒ Fe3B ⇒ FeyB(y > 3) ⇒ Fe. Determination of the optimum conditions for the boriding of DIN EN 10130-99 DC04 low carbon steel are; 10% Na2CO3 + 90% Na2B4 O7, 900 °C, 1 h, and 200 mA/cm2. The corrosion tests for the given material were carried out in different media; HCl, H2SO4, HNO3, H3 PO4, and HClO4 (10%, vol.). Electrochemically borided low carbon steel showed a corrosion rate of 0.66 × 10-3 g/cm2/day in HCl, 1.13 × 10-3 g/cm2/day in H2SO4, 1.59 × 10-3 g/cm2/day in HClO4, and 3.37 × 10-3 g/cm2/day in H3 PO4. However, it was not resistant to HNO3 with a considerable corrosion rate of 0.3 g/cm2/day.",

keywords = "Corrosion, Electrochemical boriding, FeB, Molten salt, Surface treatment",

author = "Gu Kartal and O. Kahvecioglu and S. Timur",

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AU - Kartal, Gu

AU - Kahvecioglu, O.

AU - Timur, S.

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N2 - In this study, the boriding of steels by molten salt electrolysis in borax-based electrolyte at various current densities (50-700 mA/cm2), temperatures (800-1000 °C), and time (0-2 h) was investigated. The optimum condition was determined by taking the thickness, hardness, and morphology of the boride layer into account. Different borided phases can form depending on the amount of the diffused boron from surface to matrix as follows: FeBx(x > 1) ⇒ FeB ⇒ Fe2B ⇒ Fe3B ⇒ FeyB(y > 3) ⇒ Fe. Determination of the optimum conditions for the boriding of DIN EN 10130-99 DC04 low carbon steel are; 10% Na2CO3 + 90% Na2B4 O7, 900 °C, 1 h, and 200 mA/cm2. The corrosion tests for the given material were carried out in different media; HCl, H2SO4, HNO3, H3 PO4, and HClO4 (10%, vol.). Electrochemically borided low carbon steel showed a corrosion rate of 0.66 × 10-3 g/cm2/day in HCl, 1.13 × 10-3 g/cm2/day in H2SO4, 1.59 × 10-3 g/cm2/day in HClO4, and 3.37 × 10-3 g/cm2/day in H3 PO4. However, it was not resistant to HNO3 with a considerable corrosion rate of 0.3 g/cm2/day.

AB - In this study, the boriding of steels by molten salt electrolysis in borax-based electrolyte at various current densities (50-700 mA/cm2), temperatures (800-1000 °C), and time (0-2 h) was investigated. The optimum condition was determined by taking the thickness, hardness, and morphology of the boride layer into account. Different borided phases can form depending on the amount of the diffused boron from surface to matrix as follows: FeBx(x > 1) ⇒ FeB ⇒ Fe2B ⇒ Fe3B ⇒ FeyB(y > 3) ⇒ Fe. Determination of the optimum conditions for the boriding of DIN EN 10130-99 DC04 low carbon steel are; 10% Na2CO3 + 90% Na2B4 O7, 900 °C, 1 h, and 200 mA/cm2. The corrosion tests for the given material were carried out in different media; HCl, H2SO4, HNO3, H3 PO4, and HClO4 (10%, vol.). Electrochemically borided low carbon steel showed a corrosion rate of 0.66 × 10-3 g/cm2/day in HCl, 1.13 × 10-3 g/cm2/day in H2SO4, 1.59 × 10-3 g/cm2/day in HClO4, and 3.37 × 10-3 g/cm2/day in H3 PO4. However, it was not resistant to HNO3 with a considerable corrosion rate of 0.3 g/cm2/day.

KW - Corrosion

KW - Electrochemical boriding

KW - FeB

KW - Molten salt

KW - Surface treatment

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JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

IS - 11

ER -

Investigating the morphology and corrosion behavior of electrochemically borided steel

Abstract

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Keywords

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