Hydrogen Evolution and Enrichment Around Stress Corrosion Crack Tips of Pipeline Steels in Dilute Bicarbonate Solution

Publisher Website
Google Scholar
Abstract
Hydrogen involvement in the process of stress corrosion cracking (SCC) of pipelines in a dilute bicarbonate solution was studied. Hydrogen distributions in the steels were determined using secondary ion mass spectrometry (SIMS). Results indicated hydrogen evolved from the solution, then diffused into the steels, and enriched around the notch tip. Low pH values and cathodic potentials facilitated evolution and enrichment of hydrogen in the SCC process. Measured hydrogen distributions in the steels showed two hydrogen enrichment peaks ahead of the notch tip. The first peak near the notch tip was a result of the maximum plastic strain. The second was caused by the maximum hydrostatic stress. The heights of both hydrogen enrichment peaks increased with increases in stress intensity (KI). The position of the second peak moved further away from the notch tip when KI was increased.

This publication has 0 references indexed in Scilit: