Significance of Pourbaix Diagrams to Study the Corrosion Behaviour of Hardfacing Alloys Based on Chromium Carbides at 298 K (25 °C)

Varmaa Marimuthu; Isabelle  Dulac; Krishnan Kannoorpatti

doi:10.1007/s40735-016-0047-y

Significance of Pourbaix Diagrams to Study the Corrosion Behaviour of Hardfacing Alloys Based on Chromium Carbides at 298 K (25 °C)

Varmaa Marimuthu, Isabelle Dulac, Krishnan Kannoorpatti

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

25 Citations (Scopus)

Abstract

The Pourbaix diagrams also known as the E-pH diagrams were constructed for hardfacing alloys based on three chromium carbides: Cr₇C₃, Cr₂₃C₆ and Cr₃C₂ at 298 K (25 ºC). Using the thermodynamic data available for the main species at 298 K (25 ºC), Pourbaix diagrams for the chromium carbides are constructed at a concentration of 10^-6 M of aqueous species. It was found that the diagrams are able to explain the results of experimental work performed on chromium carbides in NaOH. It was found that the stability of carbides is described only by the immune region of the Pourbaix diagram for carbides. Although passive region has been included in the study, it was unclear from the literature if there was a passive film or how protective it was.

Original language	English
Article number	17
Pages (from-to)	1-7
Number of pages	7
Journal	journal of bio- and tribo-corrosion
Volume	2
Issue number	3
DOIs	https://doi.org/10.1007/s40735-016-0047-y
Publication status	Published - Sept 2016

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title = "Significance of Pourbaix Diagrams to Study the Corrosion Behaviour of Hardfacing Alloys Based on Chromium Carbides at 298 K (25 °C)",

abstract = "The Pourbaix diagrams also known as the E-pH diagrams were constructed for hardfacing alloys based on three chromium carbides: Cr7C3, Cr23C6 and Cr3C2 at 298 K (25 ºC). Using the thermodynamic data available for the main species at 298 K (25 ºC), Pourbaix diagrams for the chromium carbides are constructed at a concentration of 10-6 M of aqueous species. It was found that the diagrams are able to explain the results of experimental work performed on chromium carbides in NaOH. It was found that the stability of carbides is described only by the immune region of the Pourbaix diagram for carbides. Although passive region has been included in the study, it was unclear from the literature if there was a passive film or how protective it was.",

keywords = "Corrosion, Chromium carbides, Pourbaix diagrams, Hardfacing , Mining",

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T1 - Significance of Pourbaix Diagrams to Study the Corrosion Behaviour of Hardfacing Alloys Based on Chromium Carbides at 298 K (25 °C)

AU - Marimuthu, Varmaa

AU - Dulac, Isabelle

AU - Kannoorpatti, Krishnan

PY - 2016/9

Y1 - 2016/9

N2 - The Pourbaix diagrams also known as the E-pH diagrams were constructed for hardfacing alloys based on three chromium carbides: Cr7C3, Cr23C6 and Cr3C2 at 298 K (25 ºC). Using the thermodynamic data available for the main species at 298 K (25 ºC), Pourbaix diagrams for the chromium carbides are constructed at a concentration of 10-6 M of aqueous species. It was found that the diagrams are able to explain the results of experimental work performed on chromium carbides in NaOH. It was found that the stability of carbides is described only by the immune region of the Pourbaix diagram for carbides. Although passive region has been included in the study, it was unclear from the literature if there was a passive film or how protective it was.

AB - The Pourbaix diagrams also known as the E-pH diagrams were constructed for hardfacing alloys based on three chromium carbides: Cr7C3, Cr23C6 and Cr3C2 at 298 K (25 ºC). Using the thermodynamic data available for the main species at 298 K (25 ºC), Pourbaix diagrams for the chromium carbides are constructed at a concentration of 10-6 M of aqueous species. It was found that the diagrams are able to explain the results of experimental work performed on chromium carbides in NaOH. It was found that the stability of carbides is described only by the immune region of the Pourbaix diagram for carbides. Although passive region has been included in the study, it was unclear from the literature if there was a passive film or how protective it was.

KW - Corrosion

KW - Chromium carbides

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Significance of Pourbaix Diagrams to Study the Corrosion Behaviour of Hardfacing Alloys Based on Chromium Carbides at 298 K (25 °C)

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