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Studies on the corrosion behaviour of wear resistant hardfacing alloy

Vargas, Margarita, Kannoorpatti, Krishnan and Murthy, Vinuthaa (2014). Studies on the corrosion behaviour of wear resistant hardfacing alloy. In: Annual Conference of the Australasian Corrosion Association 2014: Corrosion and Prevention 2014 Proceedings, Darwin, Australia, 21-24 September 2014.

Document type: Conference Paper
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IRMA ID 75039815xPUB585
Author Vargas, Margarita
Kannoorpatti, Krishnan
Murthy, Vinuthaa
Title Studies on the corrosion behaviour of wear resistant hardfacing alloy
Conference Name Annual Conference of the Australasian Corrosion Association 2014: Corrosion and Prevention 2014 Proceedings
Conference Location Darwin, Australia
Conference Dates 21-24 September 2014
Conference Publication Title Proceedings of a meeting held 21-24 September 2014, Darwin, Australia.
Publisher Australasian Corrosion Association (ACA)
Publication Year 2014
ISBN 9781634395441   (check CDU catalogue open catalogue search in new window)
Start Page 458
End Page 469
Total Pages 12
HERDC Category E1 - Conference Publication (DIISR)
Abstract Hardfacing alloys are used extensively in the mining and mineral processing industry. They usually have high concentrations of Cr (25%), C (5%) and Mn (up to 3%). Whilst the primary purpose of these alloys is to provide wear resistance, they are also used in
situations requiring both high corrosion and erosion resistance, such as the present in the alumina processing industry. The wear resistance is given by the formation of hard primary carbides (M7C3) embedded in an austenitic–eutectic matrix.

In this study, hardfacing layers were deposited on carbon steel by Plasma Arc Welding Process. Hardfacing welding electrodes with different chemical compositions were used, resulting in the production of several microstructures with diverse M7C3
stoichiometry (i.e., Cr, B, Si and Ti carbides). Immersion, electrochemical potentiodynamic polarisation and potentiostatic tests in alkaline and acidic environments show a strong influence of microstructure, phase distribution and alloying elements on the corrosion behaviour of the alloys. It has been found that the interface between the carbides and the matrix corroded due
to galvanic effects. The galvanic effect was due to depletion of chromium at the interface between carbide and matrix. Moreover, results compare to similar reports that indicate preferential corrosion of the metal matrix under reducing conditions and M7C3
susceptible to damage under oxidising conditions. Finally, the overall corrosion behavior has been correlated to the M7C3
volume fractions as well as the amount of Cr and other elements in the matrix.


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URL http://www.corrosion.com.au/
 
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Created: Wed, 19 Aug 2015, 16:39:16 CST