There is interest in using thiosulfate as a simulant for research on the sour corrosion of carbon steel because of its safety compared to the original sour test using H2S gas. The effect of Ni on trenching behavior using a simulated sour solution containing 10−3 M Na2S2O3 with pH 4.0 was investigated using a four-point bending test in various applied and open-circuit potential conditions. In this study, x-ray diffraction and scanning electron microscopy were used to characterize steel surfaces after testing. The results showed that Ni promotes trenching and is especially favored by anodic constant potential conditions. On the other hand, the amount of H2S generated by the dissociation and reaction of Na2S2O3 with the metal surface during the test was also influenced by Ni content and applied potential. Specifically, the alloying of Ni and the increase in potential promoted H2S formation. Moreover, the H2S concentrations on the steel surface during the tests at pH 4.0 in this study were estimated to correspond to the sour region 0, which is lower than previously reported test at pH 2.7. This indicates that the simulated sour test is more difficult to control H2S concentration than in our earlier sour test with actual H2S gas and found that the amount of H2S generated on each test condition must be taken into consideration carefully when investigating the corrosion behavior in a simulated sour solution containing Na2S2O3. Based on the experimental findings, the trenching mechanism of Ni-containing steel low alloy steel under 10−3 M Na2S2O3 containing acid brines with pH4.0 is proposed.
Skip Nav Destination
Article navigation
1 February 2025
Research Article|
January 08 2025
Novel Insights into Trenching of Ni-Containing Low Alloy Steel in Simulated Sour Conditions with Sodium Thiosulfate
Itaru Samusawa;
Itaru Samusawa
‡
*Steel Research Laboratory, JFE Steel Corporation, 1 Kokan-cho, Fukuyama, Hiroshima, 7210931, Japan.
**Curtin Corrosion Centre, Faculty of Science and Engineering, Curtin University, Perth, Western Australia, 6102, Australia.
‡Corresponding author. E-mail: [email protected].
Search for other works by this author on:
Junji Shimamura;
Junji Shimamura
*Steel Research Laboratory, JFE Steel Corporation, 1 Kokan-cho, Fukuyama, Hiroshima, 7210931, Japan.
Search for other works by this author on:
Ammar Al Helal;
Ammar Al Helal
**Curtin Corrosion Centre, Faculty of Science and Engineering, Curtin University, Perth, Western Australia, 6102, Australia.
Search for other works by this author on:
Thaneshan Sapanathan
Thaneshan Sapanathan
**Curtin Corrosion Centre, Faculty of Science and Engineering, Curtin University, Perth, Western Australia, 6102, Australia.
Search for other works by this author on:
CORROSION (2025) 81 (2): 182–193.
Citation
Itaru Samusawa, Junji Shimamura, Ammar Al Helal, Thaneshan Sapanathan; Novel Insights into Trenching of Ni-Containing Low Alloy Steel in Simulated Sour Conditions with Sodium Thiosulfate. CORROSION 1 February 2025; 81 (2): 182–193. doi: https://doi.org/10.5006/4651
Download citation file:
Sign in
Don't already have an account? Register
Client Account
You could not be signed in. Please check your email address / username and password and try again.
Could not validate captcha. Please try again.
Sign in via your Institution
Sign in via your Institution
2
Views
Citing articles via
The elimination of intergranular stress-corrosion cracking (IGSCC) in the corrosion of Cu-Mn alloys
Guojun Yan, Qi Xue, Xinmin Xu, Bailing Jiang
Oxide Scale Formation Behavior of Stainless Steels Exposed to the Oxidative High Concentration Alkaline Solutions
Yian Gao, Hongling Zhang, Peng Zhou, Qin Shang, Hongbin Xu
Exfoliation corrosion susceptibility of variously treated high-strength 7068 and 5059 alloys
Ankur Kumar, Arushi Garg, Gajanan P. Chaudhari
Algorithm for the Quantitative Characterization of Galvanic Corrosion Morphology from Optical Micrographs
Vangelina Osteguin, Luis Perdomo-Hurtado, Haya Abdelaziz, James Dante, Brendy C. Rincon Troconis
Stress Corrosion Cracking of 316L Stainless Steel in Concentrated Ammonium Chloride Solution with Very Low Dissolved Oxygen Levels
Jonas da Silva de Sa, Nicholas Laycock, Monir Aljaradli, Alexander Saul, Roger Newman, Guruprasad Sundararajan, Amine Haboub, Dana Abdeen, Hanan Farhat