Wang, H W and Stack, M M and Lyon, S B and Hovsepian, P. and Munz, W D (2000) The corrosion behaviour of macroparticle defects in arc bond-sputtered CrN/NbN superlattice coatings. Surface and Coatings Technology, 126 (2-3). pp. 279-287. ISSN 0257-8972Full text not available in this repository. (Request a copy from the Strathclyde author)
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.
|Keywords:||corrosion, macroparticles, droplets, PVD coatings, arc bond-sputtering, corrosion behaviour, macroparticle defects, CrN/NbN superlattice coatings , Mechanical engineering and machinery, Materials Chemistry, Surfaces, Coatings and Films, Chemistry(all), Surfaces and Interfaces, Condensed Matter Physics|
|Subjects:||Technology > Mechanical engineering and machinery|
|Department:||Faculty of Engineering > Mechanical and Aerospace Engineering|
|Depositing user:||Pure Administrator|
|Date Deposited:||17 Oct 2011 11:02|
|Last modified:||09 Sep 2016 02:32|