The exposure of zinc samples in simulated acid rain solution (SARS) was investigated under periodic wet/dry conditions using an alternating current (AC) impedance technique. The influence of relative humidity (RH), temperature, and surface inclination on the atmospheric corrosion of zinc is described. The polarization resistance reciprocal (1/Rp) decreases rapidly during the initial stages and slowly attains a steady state as the overall exposure time progresses. The experiment result shows a pronounced dependence reciprocal polarization resistance on RH. Two main components were identified in the corrosion products on zinc surfaces, namely hydrozincite (Zn5[OH]6[CO3]2) and hydrated zinc hydroxysulfate (Zn4SO4[OH]6·nH2O [n = 1, 2 and 3]). Exposure in the presence of carbonate anions gives rise to more protective corrosion products than it does in a nitrate anion solution.
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1 May 2005
Research Article|
May 01 2005
Monitoring of Initial Stages of Atmospheric Zinc Corrosion in Simulated Acid Rain Solution Under Wet/Dry Cyclic Conditions
G.A. EL-Mahdy;
G.A. EL-Mahdy
‡
fn1-1_3280641
*Department of Metallurgical System Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul,
South Korea
120-749.‡Corresponding author. E-mail: [email protected].
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K.B. Kim
K.B. Kim
**Department of Metallurgical System Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-ku, Seoul,
South Korea
120-749. Research Center for Energy Conversion and Storage, San 56-1, Shillimdong, Kwanak-gu, Seoul, 151-744, Korea.
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‡Corresponding author. E-mail: [email protected].
Present address: Chemistry Department, Faculty of Science, Helwan University, Ain-Helwan, Cairo, Egypt.
Online ISSN: 1938-159X
Print ISSN: 0010-9312
NACE International
2005
CORROSION (2005) 61 (5): 420–427.
Citation
G.A. EL-Mahdy, K.B. Kim; Monitoring of Initial Stages of Atmospheric Zinc Corrosion in Simulated Acid Rain Solution Under Wet/Dry Cyclic Conditions. CORROSION 1 May 2005; 61 (5): 420–427. https://doi.org/10.5006/1.3280641
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