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Electrochemical characterisation of porosity and corrosion resistance in electrodeposited metal coatings

Record type: Article

Electrochemical techniques for the assessment of porosity in electrodeposited metal coatings are reviewed. The determination of porosity and corrosion, resistance is illustrated by electrochemical data from three coating/substrate systems namely: electroless nickel on aluminium and steel and immersed gold coatings on an electroless copper-plated ABS polymer. Nickel coatings were up to 24 ?m thick while gold deposits had thickness between 75 and 190 nm. Tafel extrapolation and linear polarisation resistance methods were used to determine the corrosion rate of the coated substrates. The aluminium samples were tested in 5% w/v (0.85 mol dm? 3) NaCl, while coated steel and ABS samples were immersed in 0.125 mol dm? 3 H2SO4 and 0.1 mol dm? 3 NaBH4, respectively, at 295 K. Current vs. time curves and anodic polarisation behaviour have also been considered.

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Citation

Walsh, F.C., Ponce de León, C., Kerr, C,, Court, S. and Barker, B.D. (2008) Electrochemical characterisation of porosity and corrosion resistance in electrodeposited metal coatings Surface and Coatings Technology, 202, (21), pp. 5092-5102. (doi:10.1016/j.surfcoat.2008.05.008).

More information

Submitted date: 30 November 2007
Published date: 30 July 2008
Keywords: corrosion resistance, corrosion testing, current vs. time, linear polarisation resistance, electroless nickel coatings, polarisation curves, porosity, tafel extrapolation
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 54641
URI: http://eprints.soton.ac.uk/id/eprint/54641
ISSN: 0257-8972
PURE UUID: c5603b12-4f69-4b3d-9cab-14a9bed7bf2d

Catalogue record

Date deposited: 04 Aug 2008
Last modified: 17 Jul 2017 14:35

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Contributors

Author: F.C. Walsh
Author: C. Ponce de León
Author: C, Kerr
Author: S. Court
Author: B.D. Barker

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