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CORROSION BEHAVIORS OF ND: YAG LASER-GMA HYBRID WELDMENT OF AA5052-H32AlALLOYS

Author

Listed:
  • DA-QUAN ZHANG

    (Department of Environmental Engineering, Shanghai University of Electric Power, Shanghai 200090, P. R. China)

  • YOUNG WOO PARK

    (Stress Analysis and Failure Design Laboratory, School of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea)

  • KANG YONG LEE

    (Stress Analysis and Failure Design Laboratory, School of Mechanical Engineering, Yonsei University, Seoul 120-749, Korea)

Abstract

This paper investigated the corrosion behaviors of theNd: YAGlaser-gas metal arc (GMA) AA5052-H32 weldments comparing with the base alloy. The corrosion susceptibility of weldments was higher than that of the base alloy. The weld fusion zone (WFZ) suffered the severe pitting in acidic chloride media. The zones adjacent to the weld fusion boundary showed less corrosion tendency. A corrosion cracking was associated with pitting in the weldments. The surface morphology observation and composition analysis were investigated by the scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) spectroscopy. At the WFZ/HAZ interface and the HAZ/base alloy interface, the galvanic corrosion coupling existed. From the comparison, the WFZ showed anodic behavior, the zone adjacent to the weld fusion boundary showed cathodic behavior. The corrosion of WFZ was progressed by the formation of the galvanic couples.

Suggested Citation

  • Da-Quan Zhang & Young Woo Park & Kang Yong Lee, 2009. "CORROSION BEHAVIORS OF ND: YAG LASER-GMA HYBRID WELDMENT OF AA5052-H32AlALLOYS," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 16(01), pages 43-47.
    • Handle: RePEc:wsi:srlxxx:v:16:y:2009:i:01:n:s0218625x09012275
    DOI: 10.1142/S0218625X09012275
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