NaCl-Induced Atmospheric Corrosion of the MgAl Alloy AM50-The Influence of CO2
NaCl-Induced Atmospheric Corrosion of the MgAl Alloy AM50-The Influence of CO2
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DOI：
10.1149/2.088405jes
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发表时间：
2014-01-01
影响因子：
3.9
通讯作者：
Johansson, L. -G.
中科院分区：
文献类型：
--
作者：
Shahabi-Navid, M.;Esmaily, M.;Johansson, L. -G.
以99.97%Mg为参比材料，研究了NaCl对AM 50镁铝合金大气腐蚀的影响。将抛光样品在22.00 ℃、95.0%RH、400 ppm或0 ppm CO2的空气中暴露长达672 h。对样品进行了重量分析、SEM/EDX、XRD和XPS分析。CO2抑制大气腐蚀，在不存在CO2的情况下，AM 50合金的腐蚀速度快6-7倍。水镁石和meixnerite（Mg 6Al 2（OH）（18）x 4.5H（2）O）在没有CO2的情况下形成。在CO_2和NaCl存在下，生成了三种羟基碳酸镁：水菱镁矿、水菱镁矿和Mg-5（CO_3）（4）（OH）（2）x8 H（2）O。讨论了CO2对电化学腐蚀过程的影响。(C)2014年电化学学会。All rights reserved.
The NaCl-induced atmospheric corrosion of the MgAl alloy AM50 has been investigated using 99.97% Mg as reference. Polished samples were exposed up to 672 h in 95.0% RH air with 400 ppm or 0 ppm CO2 at 22.00 degrees C. Samples were analyzed gravimetrically and by SEM/EDX, XRD and XPS. CO2 inhibited atmospheric corrosion with alloy AM50 corroding 6-7 times faster in the absence of CO2. Brucite and meixnerite (Mg6Al2(OH)(18) x 4.5H(2)O) formed in the absence of CO2. In the presence of CO2 and NaCl three magnesium-hydroxy-carbonates, giorgiosite, hydromagnesite and Mg-5(CO3)(4)(OH)(2) x 8H(2)O formed. The influence of CO2 on the electrochemical corrosion process is discussed. (C) 2014 The Electrochemical Society. All rights reserved.