Excess of Cathode Protection Current over Limiting One on Oxygen as a Factor of Corrosion Cracking of Pipeline under Stress

Issue 1(51) 2009
Pages 57-61
Khizhnjakov V.I., Trofimova E.V.

In this article, experimental research results of internal stress influence and excess of cathode protection current density over limiting current density of oxygen reduction on the amount of absorbed hydrogen in steel are shown. It has been proved that the accumulation of critical hydrogen concentration at the cathode protected surface is sufficient to form hydrogen indentation which, in its turn, is affected by various factors, including internal stress and the degree of excess of cathode current protection density over limiting current density in oxygen.