HF Corrosion Control
HF is used in refineries to catalyse the formation of branched C8 olefins from smaller olefins. The alternative catalyst – sulfuric acid – also causes corrosion but provides a much weaker flux signal. HF corrosion is very widespread and continuous, and this is very evident from hydrogen flux measurements (F.W.H.Dean, P.A.Nutty, M.Carroll, Corrosion 2001, Paper 01636, Conf. series, NACE, Houston, 2010). HF corrosion is usually only controlled by means of process control. Routine monitoring with Hydrosteel 6000 and AT-S probes and Hydrosteel 7000TL is recommended to evaluate the effectiveness of attempts to mitigate corrosion.