A study of the effect of concentration build-up of electrolyte on the atmospheric corrosion of carbon steel during drying

Kyung Woo Chung, Kwang Bum Kim

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Impedance and cathodic polarization measurements for carbon steel under a thin layer of Na2SO4 solution of varying concentrations were conducted to investigate the effect of concentration build-up on the atmospheric corrosion of carbon steel. Electrolyte thickness was controlled by two methods. One is a microsyringe method which allows a predetermined amount of the electrolyte to be dropped onto the metal surface to make electrolyte layers of different thickness with the same electrolyte concentration; the other is a drying method which controls a water layer thickness through drying causing concentration build-up of electrolyte during thinning. The concentration build-up has two opposite effects on the atmospheric corrosion rate of carbon steel depending on electrolyte layer thickness. For a comparatively thick electrolyte layer in which the atmospheric corrosion of carbon steel is controlled by a cathodic oxygen reduction reaction, the concentration build-up reduced the corrosion rate. However, it increased the corrosion rate for a very thin electrolyte layer. The critical thickness for maximum corrosion rate also changed by the concentration build-up, which indicates that the concentration build-up is the important factor responsible for determining the critical thickness. (C) 2000 Elsevier Science Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)517-531
Number of pages15
JournalCorrosion Science
Volume42
Issue number3
DOIs
Publication statusPublished - 2000 Mar 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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