Posted by Dr. R.D. Kane on July 20, 1996 at 08:02:44:
In some studies that we have conducted on steel in
aqueous H2S environments exposed on only one side of a
plate, we have had concern that the mill scale on the
egress side may act as a barrier to the exit of
hydrogen. The concern is for changes that may occur
in the hydrogen concentration profile in the steel.
Normally the concentration on the egress surface is
assumed to be zero. If a barrier exists on this
surface would it lead to an effective increase in
hydrogen concentration and increase in susceptibiilty
to cracking?
To test this we added a layer of Cu plating on the
egress surface as a significant hydrogen permeation
barrier. However, we did not observe the significant
change in susceptibility anticipated. Any comments?