Effects of organic acid pickling on the corrosion resistance of magnesium alloy AZ31 sheet

Ugochukwu Chibuzoh Nwaogu, C. Blawert, N. Scharnagl, W. Dietzel, K. U. Kainer

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Organic acids were used to clean AZ31 magnesium alloy sheet and the effect of the cleaning processes on the surface condition and corrosion performance of the alloy was investigated. Organic acid cleanings reduced the surface impurities and enhanced the corrosion resistance. Removal of at least 4 mu m of the contaminated surface was required to reach corrosion rates less than 1 mm/year in salt spray condition. Among the three organic acids examined, acetic acid is the best choice. Oxalic acid can be an alternative while citric acid is not suitable for cleaning AZ31 sheet, because of insufficient removal of iron impurities.
Original languageEnglish
JournalCorrosion Science
Volume52
Issue number6
Pages (from-to)2143-2154
ISSN0010-938X
DOIs
Publication statusPublished - 2010

Keywords

  • EIS
  • IR spectroscopy
  • Weight loss
  • Acid solutions
  • Magnesium
  • Pitting corrosion

Cite this

Nwaogu, U. C., Blawert, C., Scharnagl, N., Dietzel, W., & Kainer, K. U. (2010). Effects of organic acid pickling on the corrosion resistance of magnesium alloy AZ31 sheet. Corrosion Science, 52(6), 2143-2154. https://doi.org/10.1016/j.corsci.2010.03.002