Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5148547 | International Journal of Hydrogen Energy | 2017 | 10 Pages |
Abstract
The effect of the cathodic current density (i) on the permeation of hydrogen through API X80 pipeline steels under cathodic protection was investigated using an electrochemical permeation technique. A proper equation was presented for determining the sub-surface concentration of hydrogen (c0). With the aim to enhance the predictive capabilities of the proposed equation, actual environmental parameters such as temperature were considered. The experimental results reported herein clarified the relationship between c0 and i. It was clearly shown that the ratio of c0 to the specimen thickness (L) was proportional to âi when i was lower than its critical value (iH). On the other hand, for i values above iH, c0 was equal to the saturation hydrogen content because of reaction equilibrium. Furthermore, iH was found to be dependent on temperature (i.e., iH increased with the test temperature).
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Lei Zhang, Wenhai Cao, Kuangda Lu, Zhu Wang, Yunying Xing, Yanxia Du, Minxu Lu,