Corrosion Studies of Temperature-Resistant Zinc Alloy Sacrificial Anodes and Casing Pipe at Different Temperatures

• Published in: Materials Vol. 16; no. 22; p. 7120
• Main Authors: Zhao, Mifeng, Feng, Shaobo, Hu, Fangting, Geng, Hailong, Li, Xuanpeng, Long, Yan, Feng, Wenhao, Chen, Zihan
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.11.2023
• Subjects: Alloys; Cathodic protection; Corrosion; Corrosion currents; Corrosion potential; Corrosion rate; Corrosion resistance; Corrosion tests; Electrode materials; Electrode polarization; Electrodes; Gas fields; Heat resistant alloys; High temperature; high temperature resistant; Morphology; Oil and gas exploration; Oil fields; polarization curve; sacrificial anode; Sacrificial anodes; SEM; Specialty metals industry; Steel; Zinc; zinc alloy; Zinc alloys; Zinc base alloys; Zinc products; China; United States > US
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma16227120

In order to solve the problem of external corrosion of deep well casing in oil and gas fields, a new type of high-temperature-resistant zinc alloy sacrificial anode material was used. The temperature and corrosion resistance of the new anode material and TP140 casing were investigated by simulating the high-temperature working conditions of a deep well in an oil field using high-temperature and high-pressure corrosion tests and electrochemical tests. The results showed that at 100–120 °C, the corrosion rate of TP140 protected by a sacrificial anode was only one-tenth of that under unprotected conditions, and the minimum corrosion rate of TP140 protected by a sacrificial anode at 100 °C was 0.0089 mm/a. The results of the dynamic potential polarization curve showed that the corresponding corrosion current density of TP140 first increased and then decreased with the increase in temperature. The self-corrosion potential in sacrificial anode materials first increased and then decreased with the increase in temperature, and the potential difference with TP140 gradually decreased.