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Local nucleate boiling in the crevice region between non-conforming contacting bodies causes an increase in the chemical concentration of the solution flowing in this region. This in turn may result in accelerated crevice corrosion damage. This paper is concerned with the development of a computer model for accurate prediction of the temperature field and the occurrence of nucleate boiling in the crevice region. The model recognizes the closed-loop interaction between the boiling process and the temperature field, through the changes in the conditions of heat transfer at water-cooled surfaces. It also accounts for the volumetric effect of the thermal contact resistance (TCR) and allows evaluating the thermal barrier effect caused by the increase in the TCR due to fretting corrosion. Analysis of the results indicated the significance of modeling the nonlinear behavior of the system for accurate predictions. The results also indicated that the increase in the TCR with fretting corrosion can cause the crevice corrosion process to be a self-limiting one.
crevice corrosion, fretting corrosion, thermal modeling, computer simulation
Research Engineer, Mechanical Research Department, Ontario Hydro Research Division, Toronto, Ontario