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96441 HIGH TEMPERATURE CORROSION OF ALLOYS AND CERAMICS BY ALKALI CHLORIDES

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Product Number: 51300-96441-SG
ISBN: 96441 1996 CP
Author: M.J. McNallan, Y. S. Park
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Alkali chlorides are well known to cause accelerated corrosion. At elevated temperatures, the presence of alkali chlorides as vapors or molten deposits can cause accelerated attack of either high temperature metal alloys or ceramics. The mechanism of attack is different in the two cases, however, with the chlorine component being most aggressive for corrosion of metals and the alkali being most aggressive for corrosion of ceramics. The reaction of the alkali chloride with the oxide scale on metals releases chlorine which causes accelerated corrosion. The corrosion rate can be reduced by absorbing this chlorine. For ceramics, the alkali oxide species produced by such reactions is most damaging and the rate of corrosion can be reduced by adding chlorine to the system. Keywords: oxidation, high temperature, chlorine, alkali, sodium, alloys, SiC, ceramics
Alkali chlorides are well known to cause accelerated corrosion. At elevated temperatures, the presence of alkali chlorides as vapors or molten deposits can cause accelerated attack of either high temperature metal alloys or ceramics. The mechanism of attack is different in the two cases, however, with the chlorine component being most aggressive for corrosion of metals and the alkali being most aggressive for corrosion of ceramics. The reaction of the alkali chloride with the oxide scale on metals releases chlorine which causes accelerated corrosion. The corrosion rate can be reduced by absorbing this chlorine. For ceramics, the alkali oxide species produced by such reactions is most damaging and the rate of corrosion can be reduced by adding chlorine to the system. Keywords: oxidation, high temperature, chlorine, alkali, sodium, alloys, SiC, ceramics
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