NaCl-induced atmospheric corrosion of two MgAl alloys in semi-solid cast and diecast states - Influence of microstructure and CO2
Paper i proceeding, 2014

The atmospheric corrosion of MgAl alloys AM50 and AZ91 was studied in the laboratory at constant (95.0%) relative humidity and 22°C, in the presence and absence of 400 ppm CO2. NaCl was added prior to exposure. The materials were in semi-solid cast (SSC) and pressure diecast (DC) states. Crystalline corrosion products were identified by X-ray diffraction (XRD). Alloy microstructure and corrosion morphology were characterized by scanning electron microscopy (SEM). Corrosion was more localized in CO2-free environment compared with air with 400 ppm CO2. The different corrosion behavior of the materials is discussed in terms of differences in the microstructure, especially the area fraction and distribution of β-phase. The surface film formed in the absence of NaCl was investigated by X-ray photoelectron spectroscopy (XPS).

SEM

Semi-solid casting

XPS

XRD

Atmospheric corrosion

MgAl alloys

Författare

Mehrdad Shahabi Navid

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Mohsen Esmaily

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Yu Cao

Chalmers, Material- och tillverkningsteknik, Yt- och mikrostrukturteknik

Lars-Gunnar Johansson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Jan-Erik Svensson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Materials Science and Technology Conference and Exhibition 2014, MS and T 2014, David L. Lawrence Convention CenterPittsburgh, United States, 12-16 October 2014

Vol. 2 777-784

Ämneskategorier

Kemi

ISBN

978-163439723-0