Assessing the kinetics and mechanisms of corrosion of cast and HIPed Stellite 6 in aqueous saline environments

U. Malayoglu, A. Neville, H. Lovelock

Research output: Contribution to journalLiterature review

Abstract

Cobalt-base (Stellite) alloys have seen extensive use in wear environments mainly due to their high strength, corrosion resistance and hardness. Co-base superalloys rely primarily on carbides, formed in the Co matrix and at grain boundaries, for their strength and the distribution, size and shape of carbides depends on processing conditions. Currently use of Stellite alloys has extended into various industrial sectors (e.g. pulp and paper processing, oil and gas processing, pharmaceuticals, chemical processing) and the need for improved information regarding corrosion (and often tribo-corrosion) of Stellite alloys has increased. It has been recognised that processing changes, which affect the microstructure of Stellite alloys, will most probably affect the corrosion performance. In this paper the corrosion behaviour of Stellite 6 in the as-cast and the HIP consolidated forms has been compared and contrasted using DC electrochemical techniques in static saline conditions. It has been shown that there is a significant difference in the corrosion performance of HIP consolidated Stellite 6 and it is possible to link the corrosion mechanisms to the microstructure. The benefits of using HIPing as a manufacturing process for the corrosion performance of Stellite 6 are discussed. © 2004 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)1911-1931
Number of pages21
JournalCorrosion Science
Volume47
Issue number8
DOIs
Publication statusPublished - Aug 2005

Fingerprint

Stellite
Corrosion
Kinetics
Processing
Hot isostatic pressing
Carbides
Microstructure
Superalloys
Drug products
Pulp
Corrosion resistance
Cobalt
Grain boundaries
Hardness
Wear of materials

Keywords

  • (A) Cobalt
  • (B) Polarisation
  • (C) Passive film
  • Pitting corrosion
  • Potentiostatic

Cite this

Malayoglu, U. ; Neville, A. ; Lovelock, H. / Assessing the kinetics and mechanisms of corrosion of cast and HIPed Stellite 6 in aqueous saline environments. In: Corrosion Science. 2005 ; Vol. 47, No. 8. pp. 1911-1931.
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Assessing the kinetics and mechanisms of corrosion of cast and HIPed Stellite 6 in aqueous saline environments. / Malayoglu, U.; Neville, A.; Lovelock, H.

In: Corrosion Science, Vol. 47, No. 8, 08.2005, p. 1911-1931.

Research output: Contribution to journalLiterature review

TY - JOUR

T1 - Assessing the kinetics and mechanisms of corrosion of cast and HIPed Stellite 6 in aqueous saline environments

AU - Malayoglu, U.

AU - Neville, A.

AU - Lovelock, H.

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N2 - Cobalt-base (Stellite) alloys have seen extensive use in wear environments mainly due to their high strength, corrosion resistance and hardness. Co-base superalloys rely primarily on carbides, formed in the Co matrix and at grain boundaries, for their strength and the distribution, size and shape of carbides depends on processing conditions. Currently use of Stellite alloys has extended into various industrial sectors (e.g. pulp and paper processing, oil and gas processing, pharmaceuticals, chemical processing) and the need for improved information regarding corrosion (and often tribo-corrosion) of Stellite alloys has increased. It has been recognised that processing changes, which affect the microstructure of Stellite alloys, will most probably affect the corrosion performance. In this paper the corrosion behaviour of Stellite 6 in the as-cast and the HIP consolidated forms has been compared and contrasted using DC electrochemical techniques in static saline conditions. It has been shown that there is a significant difference in the corrosion performance of HIP consolidated Stellite 6 and it is possible to link the corrosion mechanisms to the microstructure. The benefits of using HIPing as a manufacturing process for the corrosion performance of Stellite 6 are discussed. © 2004 Elsevier Ltd. All rights reserved.

AB - Cobalt-base (Stellite) alloys have seen extensive use in wear environments mainly due to their high strength, corrosion resistance and hardness. Co-base superalloys rely primarily on carbides, formed in the Co matrix and at grain boundaries, for their strength and the distribution, size and shape of carbides depends on processing conditions. Currently use of Stellite alloys has extended into various industrial sectors (e.g. pulp and paper processing, oil and gas processing, pharmaceuticals, chemical processing) and the need for improved information regarding corrosion (and often tribo-corrosion) of Stellite alloys has increased. It has been recognised that processing changes, which affect the microstructure of Stellite alloys, will most probably affect the corrosion performance. In this paper the corrosion behaviour of Stellite 6 in the as-cast and the HIP consolidated forms has been compared and contrasted using DC electrochemical techniques in static saline conditions. It has been shown that there is a significant difference in the corrosion performance of HIP consolidated Stellite 6 and it is possible to link the corrosion mechanisms to the microstructure. The benefits of using HIPing as a manufacturing process for the corrosion performance of Stellite 6 are discussed. © 2004 Elsevier Ltd. All rights reserved.

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KW - (B) Polarisation

KW - (C) Passive film

KW - Pitting corrosion

KW - Potentiostatic

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DO - 10.1016/j.corsci.2004.09.011

M3 - Literature review

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SP - 1911

EP - 1931

JO - Corrosion Science

JF - Corrosion Science

SN - 0010-938X

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