TY - JOUR
T1 - Failure analysis and experimental verification on the hydrogen-driven pitting corrosion of heat exchanger tube material
AU - Liu, Dong
AU - Hu, Junying
AU - Yuan, Xi
AU - Zhou, Li
AU - Zhong, Xiankang
N1 - Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/7
Y1 - 2022/7
N2 - Hydrogen provides a workable scheme for lightening heavy oil, but it also brings ammonium chloride (NH4Cl) corrosion which could further lead to heat exchanger tubes leakage failure during hydrocracking. Moreover, the hydrogen entering steel may shorten the service life of the material. Therefore, the effect of hydrogen on failure of the heat exchanger tube material exposed to 3.5 wt% NH4Cl solution analyzed and verified experimentally. The pitting susceptibility, semiconductive properties, surface morphologies, components of passive film were investigated using electrochemical techniques, surface characterization and Mott-Schottky analysis. The results show that hydrogen substantially decreases the charge transfer resistance and the pitting potential, and simultaneously increases the OH–/O2– ratio and the densities of point defects in passive film. The results indicate that hydrogen increases the pitting corrosion susceptibility of specimens and weaken the pitting corrosion resistance of heat exchanger tube material during hydrocracking, thus the failure occurs.
AB - Hydrogen provides a workable scheme for lightening heavy oil, but it also brings ammonium chloride (NH4Cl) corrosion which could further lead to heat exchanger tubes leakage failure during hydrocracking. Moreover, the hydrogen entering steel may shorten the service life of the material. Therefore, the effect of hydrogen on failure of the heat exchanger tube material exposed to 3.5 wt% NH4Cl solution analyzed and verified experimentally. The pitting susceptibility, semiconductive properties, surface morphologies, components of passive film were investigated using electrochemical techniques, surface characterization and Mott-Schottky analysis. The results show that hydrogen substantially decreases the charge transfer resistance and the pitting potential, and simultaneously increases the OH–/O2– ratio and the densities of point defects in passive film. The results indicate that hydrogen increases the pitting corrosion susceptibility of specimens and weaken the pitting corrosion resistance of heat exchanger tube material during hydrocracking, thus the failure occurs.
KW - Failure analysis
KW - Heat exchanger tubes
KW - Pitting corrosion
UR - https://www.scopus.com/pages/publications/85128280662
U2 - 10.1016/j.engfailanal.2022.106283
DO - 10.1016/j.engfailanal.2022.106283
M3 - 文章
AN - SCOPUS:85128280662
SN - 1350-6307
VL - 137
JO - Engineering Failure Analysis
JF - Engineering Failure Analysis
M1 - 106283
ER -