Using Wire Beam Electrode (WBE) To Evaluate The Corrosion Behavior Of Nd Steel In Acid Medium

Bo Zhao (), Yuxin Yu, Jing Guo, Tianyu Zhou, Shiwen Zou and Tong Xu
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Bo Zhao: Materials Research and Evaluation Center, China Special Equipment Inspection and Research Institute, Beijing, 100013, China
Yuxin Yu: Materials Research and Evaluation Center, China Special Equipment Inspection and Research Institute, Beijing, 100013, China
Jing Guo: Materials Research and Evaluation Center, China Special Equipment Inspection and Research Institute, Beijing, 100013, China
Tianyu Zhou: Materials Research and Evaluation Center, China Special Equipment Inspection and Research Institute, Beijing, 100013, China
Shiwen Zou: Aerospace Research Institute of Materials & Processing Technology, Beijing, 100076, China
Tong Xu: Materials Research and Evaluation Center, China Special Equipment Inspection and Research Institute, Beijing, 100013, China

Materials & Corrosion Engineering Management (MACEM), 2020, vol. 1, issue 1, 27-30

Abstract: In this article, wire beam electrode (WBE) was used to evaluate the corrosion behavior of ND steel in environmental acid atmosphere with different partial pressure of CO2. Meanwhile, corrosion products and surface morphology analysis also used to support this research. The results showed that the corrosion behavior began from the edge of droplet in dew point corrosion, and gradually spread to the center of it. The spread speed would be increasing with CO2 partial pressure enhance, which was 24h in 5% CO2 and 4h in 50% CO2. Corrosion current density in the edge of droplet can form the “cathode-anode-cathode ring” structure and disappears gradually as the corrosion time was going. Corrosion morphology observation results showed three ring shapes region and different elemental composition of different corrosion products, which is correspondence with the “cathode-anode We-cathode ring” structure measured in WBE experiments. The results showed that the reaction gradually transferred to the uniform corrosion on electrode surface when the dew point corrosion reaction reaching the late stage. It comes from the dissolution, diffusion and reaction of gaseous corrosion medium of CO2 and O2.

Keywords: wire beam electrode; CO2; Corrosion. (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:zib:zmacem:v:1:y:2020:i:2:p:27-30

DOI: 10.26480/macem.02.2020.27.30

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