Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 20    No. 10    October 2010

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Corrosion behavior of Mg-Al-Pb and Mg-Al-Pb-Zn-Mn alloys in 3.5% NaCl solution
WANG Nai-guang(王乃光)1, WANG Ri-chu(王日初)1, PENG Chao-qun(彭超群)1,
FENG Yan(冯 艳)1, ZHANG Xiang-yu(张翔宇)2

1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Changsha Research Institute of Mining and Metallurgy, Changsha 410012, China

Abstract:Mg-6%Al-5%Pb and Mg-6%Al-5%Pb-0.55%Zn-0.22%Mn (mass fraction) alloys were prepared by induction melting with the prote, ction of argon. The corrosion behaviors of these alloys were studied by electrochemical measurements and immersion tests. The results show that at the corrosion onset of Mg-Al-Pb anode there is an incubation period that can be shortened with 0.55%Zn and 0.22%Mn additions in the magnesium matrix. The corrosion rate of Mg-Al-Pb anode is mainly determined by the incubation period. Short incubation period always leads to high corrosion rate while long incubation period leads to low corrosion rate. The corrosion rates based on the corrosion current density by the electrochemical measurements do not agree with the measurements evaluated from the evolved hydrogen volume.


Key words: magnesium anode; AP65 Mg alloy; corrosion resistance; hydrogen evolution; electrochemistry

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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