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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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pH value in simulated occluded corrosion cell for magnesium alloys
ZENG Rong-chang(曾荣昌)1, CHEN Jun(陈  君)1, KE Wei(柯  伟)2,
Han En-hou(韩恩厚)2, W. Dietzel3

1. School of Materials Science and Engineering, Chongqing Institute of Technology, Chongqing 400050, China;
2. Environmental Corrosion Center, Institute of Metals Research,
Chinese Academy of Sciences, Shenyang 110016, China;
3. GKSS Research Centre Geesthacht GmbH, Geesthacht 21502, Germany

Abstract:Corrosion of magnesium alloys is an important issue for their applications in automobile and aerospace industry. pH values as a function of time in two types of simulated occluded corrosion cells (OCC) for magnesium alloys AZ80 and AM60 were measured. The influence of mass ratio of solution to material or liquid to solid ratio (L/S ratio), initial pH value and chemical compositions of solutions on pH value in OCC was discussed. The experimental results show that pH value for magnesium alloys increases gradually or rapidly in Occ, depending on L/S ratio, initial pH value of solution and chloride ions concentration etc, and then reaches up to 10.5−10.6 and finally stabilizes at the level. The onset in the pH value time curve corresponds to the precipitate of magnesium hydroxide according to the theoretical calculation.

 

Key words: magnesium alloy; pH value; corrosion; occluded corrosion cell; free corrosion potential

ISSN 1672-7029
CN 43-1423/U

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