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Magnesium Corrosion Mechanisms
Song, G. L.,Atrens, A. 한국부식방식학회 2002 Corrosion Science and Technology Vol.31 No.2
This paper provides an overview of the corrosion mechanisms of magnesium alloys based on our recent research and the literature. Magnesium is a very reactive metal. Thus galvanic cmosian is very important. Galvanic corrosion is associated with (1) impurities, particularly Fe, Ni & Cu (2) second phases, eg β, and (3) coupling with a less active metal. Magnesium alloys exposed without galvanic coupling have a corrosion resistance that, in general, is not as good as that of aluminium alloys. When magnesium is passive, then the corrosion rates are low. But the range of environmental conditions for passivity for magnesium is less than for aluminium; ie passive films are not very stable. Corrosion is typically important as localised corrosion such as pitting & SCC. There is the expectation that SCC failures will increase with increased use of Mg alloys in load bearing applications. Corrosion of AZ91 is by "pitting" in IN NaCI. The corrosion potential, Ecorr is above the "pitting" potential. Corrosion of cast AZ91 has the following morphologies, (1) preferential attack of primary α, (2) preferential attack of eutectic α & undermining of β. The β phase is more stable than α, and β is a better cathode. There is corrosion protection and low corrosion rates if there is a significant fraction of finely divided continuous β. Otherwise β accelerates corrosion. Corrosion acceleration is significant if there are large blocks of interconnected β. Corrosion acceleration may be small if β is small and finely divided.
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Thermal Desorption Spectroscopy Study of the Interaction of Hydrogen with TiC Precipitates
D. Pérez Escobar,E. Wallaert,L. Duprez,A.Atrens,K. Verbeken 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.4
Thermal desorption spectroscopy (TDS) was used to study hydrogen-trap interactions for an experimental steel (0.025 wt%C-0.09%Ti). After lab processing, the microstructure consisted of small (~20 μm) ferrite grains containing nanometer TiC precipitates. After hot and cold rolling, the material contained some hydrogen (originated from the hot rolling) in irreversible traps, the TiC precipitates. After annealing in hydrogen, the TDS spectra consisted of a high temperature peak, attributed to irreversible trapping by TiC precipitates. Annealing slightly increased the TiC precipitate size. Both the peak temperature and peak area increased with increasing annealing temperature. The increase in peak area occurred together with the increase in TiC precipitate size. The TDS spectra for samples annealed at 800 °C, and electrochemically charged, contained (i) a low temperature peak which decreased in height with increasing desorption time,and (ii) a high temperature peak that did not change significantly with desorption time, and was similar to those after gaseous charging. The low temperature peak was attributed to reversible traps such as grain boundaries, whereas the high temperature peak was attributed to irreversible trapping by TiC precipitates. The high temperature TDS peak was composed of constituent peaks with essentially the same activation energy of 145 kJ/mol.
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