خوردگی داغ مواد : مکانیزم جریان سیال ؟

  ?Hot corrosion of materials: a fluxing mechanism

خوردگی داغ مواد :  مکانیزم جریان سیال  ؟

ABSTRACT

Hot corrosion is the accelerated oxidation of a material at elevated temperature induced by a thin  film of fused salt deposit. Fused Na2 S04 , which is the dominant salt involved in hot corrosion, is an ionic conductor, so that the corrosion mechanism is certainly electrochemical in nature.  Further, the acid/base nature of this oxyanion salt offers the possibility for the disso- lution  (fluxing) of the normally protective oxide scale. Non-protective precipitated oxide par- ticles are  often observed in the corrosion products. In this paper, the status of knowledge for the  solubilities of oxides in fused Na2 S04 is reviewed, and the effects of various influences on a  fluxing mechanism are discussed. An evaluation of a negative solubility gradient as a cri- terion  for continuing hot corrosion is made. © 2001 Elsevier Science Ltd. All rights reserved.