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Journal article

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

By Nwaogu, Ugochukwu Chibuzoh1,2; Blawert, C.3; Scharnagl, N.3; Dietzel, W.3; Kainer, K. U.3

From

Manufacturing Engineering, Department of Mechanical Engineering, Technical University of Denmark1

Department of Mechanical Engineering, Technical University of Denmark2

Helmholtz-Zentrum Hereon3

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.

Language: English
Year: 2010
Pages: 2143-2154
ISSN: 0010938x and 18790496
Types: Journal article
DOI: 10.1016/j.corsci.2010.03.002
Keywords

Acid solutions EIS IR spectroscopy Magnesium Pitting corrosion Weight loss

Other keywords

A. Acid solutions A. Magnesium B. EIS B. IR spectroscopy B. Weight loss C. Pitting corrosion

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