TY - JOUR

T1 - Effects of organic acid pickling on the corrosion resistance of magnesium alloy AZ31 sheet

A1 - Nwaogu,Ugochukwu Chibuzoh

A1 - Blawert,C.

A1 - Scharnagl,N.

A1 - Dietzel,W.

A1 - Kainer,K. U.

AU - Nwaogu,Ugochukwu Chibuzoh

AU - Blawert,C.

AU - Scharnagl,N.

AU - Dietzel,W.

AU - Kainer,K. U.

PB - Pergamon

PY - 2010

Y1 - 2010

N2 - 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.

AB - 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.

KW - EIS

KW - IR spectroscopy

KW - Weight loss

KW - Acid solutions

KW - Magnesium

KW - Pitting corrosion

U2 - 10.1016/j.corsci.2010.03.002

DO - 10.1016/j.corsci.2010.03.002

JO - Corrosion Science

JF - Corrosion Science

SN - 0010-938X

IS - 6

VL - 52

SP - 2143

EP - 2154

ER -