US 12,265,017 B2
Method for establishing hydrogen charging model for pipeline steel in equivalent wet hydrogen sulfide environment and application thereof
Lianyong Xu, Tianjin (CN); Yongdian Han, Tianjin (CN); Jiajun Shao, Tianjin (CN); Lei Zhao, Tianjin (CN); and Kangda Hao, Tianjin (CN)
Assigned to Tianjin University, Tianjin (CN)
Filed by Tianjin University, Tianjin (CN)
Filed on Aug. 28, 2024, as Appl. No. 18/818,481.
Claims priority of application No. 202311108371.7 (CN), filed on Aug. 29, 2023.
Prior Publication US 2025/0076180 A1, Mar. 6, 2025
Int. Cl. G01N 17/02 (2006.01); G16C 20/00 (2019.01)
CPC G01N 17/02 (2013.01) [G16C 20/00 (2019.02)] 6 Claims
OG exemplary drawing
 
1. A method for establishing a hydrogen charging model for pipeline steel in an equivalent wet hydrogen sulfide environment, wherein the establishment method comprises the following:
S1: using a cathode hydrogen charging method and a wet hydrogen sulfide environment method respectively to perform hydrogen charging on each sample to be tested under different reaction conditions to obtain a plurality of first hydrogen charging samples and second hydrogen charging samples, wherein the cathode hydrogen charging method specifically comprises: placing the sample to be tested as a cathode in an electrolyte solution, and performing cathode hydrogen charging at a preset hydrogen charging time and a current density;
S2: measuring a hydrogen content of each of the first hydrogen charging samples and the second hydrogen charging samples, and adopting an electrochemical method for measuring the hydrogen content, specifically: measuring an anode current change of a sample not charged with hydrogen, and using it as a background current curve; then, testing the anode current change of each of the first hydrogen charging samples and the second hydrogen charging samples under the same conditions respectively, and performing interpolation calculation on the anode current change of each of the first hydrogen charging samples and the second hydrogen charging samples with an area of the background current curve to obtain the hydrogen content of each of the first hydrogen charging samples and the second hydrogen charging samples;
S3: performing curve fitting on variables in the two methods respectively according to the hydrogen content obtained in Step S2, and obtaining the hydrogen charging model for the pipeline steel in the equivalent wet hydrogen sulfide environment according to a fitting result, wherein the hydrogen charging model for the pipeline steel in the equivalent wet hydrogen sulfide environment is specifically:

OG Complex Work Unit Math
wherein in the formula, CH1 is the hydrogen concentration of the first hydrogen charging samples obtained by the cathode hydrogen charging method, A1, B1, and C1 are the corresponding coefficients of the fitting surface in the cathode hydrogen charging method, t1 is the hydrogen charging time of the cathode hydrogen charging method, i is the current density of the cathode hydrogen charging method, CH2 is the hydrogen concentration of the second hydrogen charging samples obtained by the wet hydrogen sulfide environment method, A2, B2, and C2 are the corresponding coefficients of the fitting surface in the wet hydrogen sulfide environment method, t2 is the hydrogen charging time of the wet hydrogen sulfide environment method, and CH2S is the hydrogen sulfide concentration of the solution in the wet hydrogen sulfide environment method.