EFFECTS OF CATHODIC POLARIZATION ON THE HYDROGEN EMBRITTLEMENT SENSITIVITY OF 921A STEEL IN SEA WATER

J Chin Soc Corr Pro

2010, Vol. 30

Issue (1): 83-88 DOI:

技术报告

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EFFECTS OF CATHODIC POLARIZATION ON THE HYDROGEN EMBRITTLEMENT SENSITIVITY OF 921A STEEL IN SEA WATER

CHANG E^1;2; YAN Yonggui²; LI Qingfen³; MA Li²

1. School of Materials Science and Chemical Engineering; Harbin Engineering University; Harerbin 150001
2. Luoyang Ship Material Research Institute; State Key Laboratory for Marine Corrosion and Protection; Qingdao 266071
3. School of Mechanical and Electrical Engineering; Harbin Engineering University; Harerbin 150001

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Abstract

The susceptibility of 921A steel to hydrogen embrittlement was investigated by slow strain rate test and electrochemical study at different cathodic polarization potentials. Fracture surfaces observation were made by three-dimension microscope and scanning electron microscope (SEM). The results showed that the elongation, time-to-fracture, and fracture energy ratio decreased and hydrogen embrittlement coefficient increased with shifting potential in the negative direction. The elongation, time-to-fracture, and fracture energy ratio displayed uniform variance trend and exhibited the highest values when polarization potential was -0.710 V_SCE. when the polarization potentials were negative to -0.960 V _SCE, the hydrogen embrittlement coefficient suddenly increased and the fracture surfaces exhibited quasi-cleavage fracture. The brittle fracture was observed by three-dimension microscope when the polarization potential was -1.110 V_SCE. The resistance of hydrogen embrittlement decreased when the polarization potential reached -0.960 V_SCE.

Key words: slow strain rate test 921A steel hydrogen embrittlemen cathodic polarization

Received: 14 July 2008

ZTFLH:

TG172.5

Corresponding Authors: CHANG E E-mail: change@sunrui.net

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CHANG E; YAN Yonggui; LI Qingfen; MA Li. EFFECTS OF CATHODIC POLARIZATION ON THE HYDROGEN EMBRITTLEMENT SENSITIVITY OF 921A STEEL IN SEA WATER. J Chin Soc Corr Pro, 2010, 30(1): 83-88.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2010/V30/I1/83

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