EFFECTS OF CATHODIC POLARIZATION ON THE HYDROGEN EMBRITTLEMENT SENSITIVITY OF WELDING LINE IN HIGH STRENGTH HULL STRUCTURAL STEEL

J Chin Soc Corr Pro

2011, Vol. 31

Issue (1): 46-50 DOI:

Research Articles

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EFFECTS OF CATHODIC POLARIZATION ON THE HYDROGEN EMBRITTLEMENT SENSITIVITY OF WELDING LINE IN HIGH STRENGTH HULL STRUCTURAL STEEL

LIN Zhaoqiang, MA Li, YAN Yonggui

State Key Laboratory for Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266071

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Abstract Electrochemical properties and mechanical properties of welded high strength steel were investigated by the slow strain rate test (SSRT) method with applied constant cathodic potential. During tensile process the fracture occurred mainly in the weld fusion zone. There was no correlation between maximum tensile strength, yield strength, strength at failure, and hydrogen embrittlement. However, the elongation rate, time-to-fracture and strain-to-failure rate decreased with shifting potential of the negative direction. And the elongation rate, time-to-fracture and strain-to-failure rate displayed the highest values when the potential was -0.89 V (vs SCE). As the cathode potential shifted negatively, the fracture mode gradually shifted from ductile fracture to brittle fracture, and also the sensitivity of hydrogen embrittlement gradually increased. When the polarization potentials between -0.70~-0.89 V (vs SCE), the hydrogen embrittlement coefficient were less than 5%, the hydrogen embrittlement did not occured. When it was negative to -0.94 V (vs SCE), the hydrogen embrittlement susceptibility rapidly increased, while when the polarization potential was -0.99 V (vs SCE), the hydrogen embrittlement coefficient closed to 20% and the fracture surface exhibited some small cell cleavage characteristics of quasi-cleavage fracture. When the polarization potentials were negative to -1.04 V (vs SCE), the hydrogen embrittlement coefficient were more than 25%, and the material reached into the dangerous zone. The surface of fracture appeared more thick cell cleavage characteristics of quasi-cleavage, and cleavage fracture of hydrogen embrittlement. When the polarization potentials negative to -1.14 V (vs SCE), the specimen occured mainly cleavage organization, intergranular, transgranular structure or combination of the two of brittle fracture characteristics of hydrogen embrittlement.

Key words: hydrogen embrittlement cathodic polarization slow strain rate test welding line cathodic potential

Received: 15 December 2009

ZTFLH:

O646

Corresponding Authors: YAN Yonggui E-mail: yanyg@sunrui.net

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LIN Zhaoqiang, MA Li, YAN Yonggui. EFFECTS OF CATHODIC POLARIZATION ON THE HYDROGEN EMBRITTLEMENT SENSITIVITY OF WELDING LINE IN HIGH STRENGTH HULL STRUCTURAL STEEL. J Chin Soc Corr Pro, 2011, 31(1): 46-50.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2011/V31/I1/46

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