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Influence of Ultrasonic Nanocrystal Surface Modification on the Corrosion and Stress Corrosion Cracking Behavior of Welded Joint in District Heating Pipe

Stress corrosion cracking behavior measured by slow-strain rate tests with accelerated anodic & cathodic reactions. Results indicated the UNSM treatment has a significant effect on the corrosion condition. No effect appeared in the hydrogen embrittlement.

Product Number: 51317--8953-SG
ISBN: 8953 2017 CP
Author: Yong-Sang Kim
Publication Date: 2017
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$20.00
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The effect of ultrasonic nanocrystal surface modification (UNSM) on the corrosion and stress corrosion cracking behavior of welded joint in district heating pipe were investigated. After UNSM treatment the microstructure of welded joint was transformed from the grain boundary ferrite widmanstatten ferrite to polygoanl ferrite and refined the grain. In the electrochemical tests the corrosion resistance of welded joint was increased after UNSM treatment due to the grain refinement and stability of oxide film. The stress corrosion cracking behavior was measured by slow-strain rate tests with accelerated anodic and cathodic reactions. The results indicated that the UNSM treatment has a significant effect on the corrosion condition whereas no effect appeared on the hydrogen embrittlement.

Key words: weld, steel, corrosion, stress corrosion cracking, polarization

The effect of ultrasonic nanocrystal surface modification (UNSM) on the corrosion and stress corrosion cracking behavior of welded joint in district heating pipe were investigated. After UNSM treatment the microstructure of welded joint was transformed from the grain boundary ferrite widmanstatten ferrite to polygoanl ferrite and refined the grain. In the electrochemical tests the corrosion resistance of welded joint was increased after UNSM treatment due to the grain refinement and stability of oxide film. The stress corrosion cracking behavior was measured by slow-strain rate tests with accelerated anodic and cathodic reactions. The results indicated that the UNSM treatment has a significant effect on the corrosion condition whereas no effect appeared on the hydrogen embrittlement.

Key words: weld, steel, corrosion, stress corrosion cracking, polarization

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