Abstract
The optimum conditions for the fluorine passivation of 316L stainless steel are described. The direct fluoridation products formed at temperatures of 320 degrees C or lower are composed solely of FeF/sub 2/, while those which were formed at the temperatures of 330 degrees C or higher have a compound-phase composition of FeF/sub 2/ and FeF/sub 3/. At a critical temperature (400 degrees C for 316L stainless steel) of the thermal modification process, FeF/sub 3/ is converted to FeF/sub 2/ and disappears completely as the temperature rises. Meanwhile, CrF/sub 3/ is formed at a certain temperature (440 degrees C for 316L stainless steel). The two-phase composition gets further crystallized as the thermal modification temperature rises. As the crystal growth induces the cracks on the fluoridated film, it is very difficult to form a satisfactory passivation film from the two-phase composition by thermal modification. It is confirmed that excellent passivation film has been obtained from the single-phase composition by the optimum fluoridation following the optimum thermal modification. >
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