Abstract
Reduction in mechanical strength of iron and steel can result from the absorption of atomic hydrogen produced by the action of acid on the metal.
This is designated as hydrogen embrittlement. When acidcleaning large iron and steel equipment, it is necessary to prevent hydrogen embrittlement which may result serious failures.
The author investigated the effect of Urotropin on hydrogen embrittlement by measuring the mechanical strengths of mild steel, cast iron and steel casting which have been acid-cleaned and illustrated that Urotropin has the effect of preventing hydorogen embrittlement.
