NaCl-Induced Atmospheric Corrosion of the MgAl Alloy AM50-The Influence of CO2
Journal article, 2014

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°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 × 4.5H2O) formed in the absence of CO2. In the presence of CO2 and NaCl three magnesium-hydroxy-carbonates, giorgiosite, hydromagnesite and Mg5(CO3)4(OH)2 × 8H2O formed. The influence of CO2 on the electrochemical corrosion process is discussed.

XPS

BIB

Atmospheric Corrosion

SEM

MgAl alloy

XRD

Author

Mehrdad Shahabi Navid

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Mohsen Esmaily

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Jan-Erik Svensson

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Mats Halvarsson

Chalmers, Applied Physics, Materials Microstructure

Lars Nyborg

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Yu Cao

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Lars-Gunnar Johansson

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Journal of the Electrochemical Society

0013-4651 (ISSN)

Vol. 161 6 C277-C287

Driving Forces

Sustainable development

Subject Categories

Materials Engineering

Corrosion Engineering

Areas of Advance

Materials Science

DOI

10.1149/2.088405jes

More information

Created

10/7/2017