Powder mixtures of FeB and CrB were compacted and then treated at 1000 degr
ees C under vacuum for 8 h in order to obtain information on the solid stat
e reactivity of the monoborides, useful to clarify the growth mechanism of
boride coatings on chromium steels and to optimize the conditions of the th
ermochemical process. The effects of diffusion phenomena are pointed out an
d the relevant mechanisms discussed.