The corrosion behaviour of macroparticle defects in arc bond-sputtered CrN/NbN superlattice coatings

H W Wang, M M Stack, S B Lyon, P. Hovsepian, W D Munz

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

The investigation concerned the corrosion behaviour of macroparticle and growth defects in PVD CrN/NbN superlattice coatings formed by are bond-sputtering (ABS) process on a mild steel BS6323. The electrochemical behaviour of the coatings was firstly studied by potentiodynamic polarising in de-aerated 0.5 M (Na2CO3-NaHCO3) buffer and 5% NaCl solutions, respectively. The coating and defects were then examined in planar view and cross-section by scanning electron microscopic analyses and the results were compared with those prior to the electrochemical measurement. It is found that the overall coating/substrate corrosion process is closely related to the deleterious effect of the macroparticles and growth defects in the PVD coatings. It is further demonstrated that for through thickness macroparticle inclusions, corrosion initiates by galvanic or crevice corrosion between the defect and the coating matrix, subsequently permitting solution access to those defects with eventual substrate pitting and corrosion at the coating/substrate interface. On the basis of the experimental findings and the macroparticle formation theory, the mechanisms of the growth defect-related coating/substrate corrosion are finally proposed. (C) 2000 Published by Elsevier Science S.A. All rights reserved.

LanguageEnglish
Pages279-287
Number of pages9
JournalSurface and Coatings Technology
Volume126
Issue number2-3
DOIs
Publication statusPublished - 24 Apr 2000

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corrosion
arcs
Corrosion
coatings
Coatings
Defects
defects
Physical vapor deposition
Substrates
pitting
Pitting
Carbon steel
Sputtering
Buffers
cracks
buffers
sputtering
steels
inclusions
Scanning

Keywords

  • corrosion
  • macroparticles
  • droplets
  • PVD coatings
  • arc bond-sputtering
  • corrosion behaviour
  • macroparticle defects
  • CrN/NbN superlattice coatings

Cite this

Wang, H W ; Stack, M M ; Lyon, S B ; Hovsepian, P. ; Munz, W D . / The corrosion behaviour of macroparticle defects in arc bond-sputtered CrN/NbN superlattice coatings. In: Surface and Coatings Technology. 2000 ; Vol. 126, No. 2-3. pp. 279-287.
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The corrosion behaviour of macroparticle defects in arc bond-sputtered CrN/NbN superlattice coatings. / Wang, H W ; Stack, M M ; Lyon, S B ; Hovsepian, P.; Munz, W D .

In: Surface and Coatings Technology, Vol. 126, No. 2-3, 24.04.2000, p. 279-287.

Research output: Contribution to journalArticle

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T1 - The corrosion behaviour of macroparticle defects in arc bond-sputtered CrN/NbN superlattice coatings

AU - Wang, H W

AU - Stack, M M

AU - Lyon, S B

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AU - Munz, W D

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N2 - The investigation concerned the corrosion behaviour of macroparticle and growth defects in PVD CrN/NbN superlattice coatings formed by are bond-sputtering (ABS) process on a mild steel BS6323. The electrochemical behaviour of the coatings was firstly studied by potentiodynamic polarising in de-aerated 0.5 M (Na2CO3-NaHCO3) buffer and 5% NaCl solutions, respectively. The coating and defects were then examined in planar view and cross-section by scanning electron microscopic analyses and the results were compared with those prior to the electrochemical measurement. It is found that the overall coating/substrate corrosion process is closely related to the deleterious effect of the macroparticles and growth defects in the PVD coatings. It is further demonstrated that for through thickness macroparticle inclusions, corrosion initiates by galvanic or crevice corrosion between the defect and the coating matrix, subsequently permitting solution access to those defects with eventual substrate pitting and corrosion at the coating/substrate interface. On the basis of the experimental findings and the macroparticle formation theory, the mechanisms of the growth defect-related coating/substrate corrosion are finally proposed. (C) 2000 Published by Elsevier Science S.A. All rights reserved.

AB - The investigation concerned the corrosion behaviour of macroparticle and growth defects in PVD CrN/NbN superlattice coatings formed by are bond-sputtering (ABS) process on a mild steel BS6323. The electrochemical behaviour of the coatings was firstly studied by potentiodynamic polarising in de-aerated 0.5 M (Na2CO3-NaHCO3) buffer and 5% NaCl solutions, respectively. The coating and defects were then examined in planar view and cross-section by scanning electron microscopic analyses and the results were compared with those prior to the electrochemical measurement. It is found that the overall coating/substrate corrosion process is closely related to the deleterious effect of the macroparticles and growth defects in the PVD coatings. It is further demonstrated that for through thickness macroparticle inclusions, corrosion initiates by galvanic or crevice corrosion between the defect and the coating matrix, subsequently permitting solution access to those defects with eventual substrate pitting and corrosion at the coating/substrate interface. On the basis of the experimental findings and the macroparticle formation theory, the mechanisms of the growth defect-related coating/substrate corrosion are finally proposed. (C) 2000 Published by Elsevier Science S.A. All rights reserved.

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KW - droplets

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