mm5aho wrote:While it is "pickling" in acid, some H2 is formed.
It is possible to "clean" the steel by blast cleaning, but the reprofiling that often results alters the coating characteristics. Sometimes positively, sometimes adversely depending on the other factors involved.
It could be that the anchors is galvanized that way.
So, just so I can get this into my head, the hydrogen comes from the hydrochloric acid and the way to avoid the problem would be to use blast cleaning not chemical.