Corrosion and passivation mechanism of chromium diboride coatings on stainless steel

Larry R. Jordan; Anthony J. Betts; Karl L. Dahm; Peter A. Dearnley; Graham A. Wright

doi:10.1016/j.corsci.2003.10.018

Corrosion and passivation mechanism of chromium diboride coatings on stainless steel

Larry R. Jordan, Anthony J. Betts, Karl L. Dahm, Peter A. Dearnley, Graham A. Wright

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

Abstract

The corrosion resistance of fully crystalline CrB₂ coatings magnetron sputtered onto AISI 316L stainless steel was tested in acidic solutions. CrB₂ coatings showed excellent corrosion protection, but suffered a breakdown when an anodic potential of greater than about +1 V (SHE) was applied to the surface in a l M HCl electrolyte. The coating failure at high potentials is attributed to transpassive dissolution of the coating at volume defects, enabling the electrolyte to reach the underlying 316L substrate, resulting in its rapid corrosion and subsequent fracturing of the coating. Electrochemical data and potential-pH (Pourbaix) diagrams, constructed from thermodynamic data, indicate that the corrosion resistance of CrB₂ is due to the formation of a Cr(III) oxide passive film in the absence of activation corrosion.

Original language	English
Pages (from-to)	1085-1096
Number of pages	12
Journal	Corrosion Science
Volume	47
Issue number	5
DOIs	https://doi.org/10.1016/j.corsci.2003.10.018
Publication status	Published - May 2005
Externally published	Yes

Keywords

A. Acid solutions
A. Sputtered films
C. Passive films
C. Pourbaix diagram

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10.1016/j.corsci.2003.10.018

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@article{39620b58db904bc6a3389f3f87003f51,

title = "Corrosion and passivation mechanism of chromium diboride coatings on stainless steel",

abstract = "The corrosion resistance of fully crystalline CrB2 coatings magnetron sputtered onto AISI 316L stainless steel was tested in acidic solutions. CrB2 coatings showed excellent corrosion protection, but suffered a breakdown when an anodic potential of greater than about +1 V (SHE) was applied to the surface in a l M HCl electrolyte. The coating failure at high potentials is attributed to transpassive dissolution of the coating at volume defects, enabling the electrolyte to reach the underlying 316L substrate, resulting in its rapid corrosion and subsequent fracturing of the coating. Electrochemical data and potential-pH (Pourbaix) diagrams, constructed from thermodynamic data, indicate that the corrosion resistance of CrB2 is due to the formation of a Cr(III) oxide passive film in the absence of activation corrosion.",

keywords = "A. Acid solutions, A. Sputtered films, C. Passive films, C. Pourbaix diagram",

author = "Jordan, {Larry R.} and Betts, {Anthony J.} and Dahm, {Karl L.} and Dearnley, {Peter A.} and Wright, {Graham A.}",

note = "Funding Information: The Support of the New Zealand Foundation for Research Science and Technology is gratefully acknowledged. The authors would like to thank R.K. Singh Raman of Monash University, Melbourne, for his help with preparing this manuscript. ",

year = "2005",

month = may,

doi = "10.1016/j.corsci.2003.10.018",

language = "English",

volume = "47",

pages = "1085--1096",

journal = "Corrosion Science",

issn = "0010-938X",

publisher = "Elsevier Ltd.",

number = "5",

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TY - JOUR

T1 - Corrosion and passivation mechanism of chromium diboride coatings on stainless steel

AU - Jordan, Larry R.

AU - Betts, Anthony J.

AU - Dahm, Karl L.

AU - Dearnley, Peter A.

AU - Wright, Graham A.

N1 - Funding Information: The Support of the New Zealand Foundation for Research Science and Technology is gratefully acknowledged. The authors would like to thank R.K. Singh Raman of Monash University, Melbourne, for his help with preparing this manuscript.

PY - 2005/5

Y1 - 2005/5

N2 - The corrosion resistance of fully crystalline CrB2 coatings magnetron sputtered onto AISI 316L stainless steel was tested in acidic solutions. CrB2 coatings showed excellent corrosion protection, but suffered a breakdown when an anodic potential of greater than about +1 V (SHE) was applied to the surface in a l M HCl electrolyte. The coating failure at high potentials is attributed to transpassive dissolution of the coating at volume defects, enabling the electrolyte to reach the underlying 316L substrate, resulting in its rapid corrosion and subsequent fracturing of the coating. Electrochemical data and potential-pH (Pourbaix) diagrams, constructed from thermodynamic data, indicate that the corrosion resistance of CrB2 is due to the formation of a Cr(III) oxide passive film in the absence of activation corrosion.

AB - The corrosion resistance of fully crystalline CrB2 coatings magnetron sputtered onto AISI 316L stainless steel was tested in acidic solutions. CrB2 coatings showed excellent corrosion protection, but suffered a breakdown when an anodic potential of greater than about +1 V (SHE) was applied to the surface in a l M HCl electrolyte. The coating failure at high potentials is attributed to transpassive dissolution of the coating at volume defects, enabling the electrolyte to reach the underlying 316L substrate, resulting in its rapid corrosion and subsequent fracturing of the coating. Electrochemical data and potential-pH (Pourbaix) diagrams, constructed from thermodynamic data, indicate that the corrosion resistance of CrB2 is due to the formation of a Cr(III) oxide passive film in the absence of activation corrosion.

KW - A. Acid solutions

KW - A. Sputtered films

KW - C. Passive films

KW - C. Pourbaix diagram

UR - http://www.scopus.com/inward/record.url?scp=12444341936&partnerID=8YFLogxK

U2 - 10.1016/j.corsci.2003.10.018

DO - 10.1016/j.corsci.2003.10.018

M3 - Article

AN - SCOPUS:12444341936

SN - 0010-938X

VL - 47

SP - 1085

EP - 1096

JO - Corrosion Science

JF - Corrosion Science

IS - 5

ER -

Corrosion and passivation mechanism of chromium diboride coatings on stainless steel

Abstract

Keywords

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