Abstract
Film growth on mild steel in chromate solutions was found to be logarithmic with respect to time for all types of surface preparation tested; these included polished, abraded, pickled and grit-blasted surfaces. Growth constants, and also the monolayer uptake of‘labelled’ chromium, Cr*, before logarithmic film growth started, varied in a similar fashion as different types of surface preparation were used.
Relative values of surface roughness factor (S.R.F.) calculated from relative values ofgrowth constants agreed with published values of S.R.F. for comparable suffaces, where these were available.
It is suggested that measurements of Cr* uptake with respect to time made instandardised conditions could be used as a method of determining relative S.R.F.
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