Abstract

Laser surface modification (LSM) was performed on autogenously welded samples to homogenize the weld microstructure and mitigate poor corrosion performance. Characterization of weld zone corrosion behavior and microstructure was performed using established electrochemical analysis techniques and scanning electron microscopy. Following LSM, partial chemical homogenization was observed for regions of the base alloy, along with the fusion zone and heat affected zone. The corrosion rates for the isolated weld zones followed a similar trend with an increase in chemical uniformity as determined by electrochemical impedance spectroscopy, gravimetric mass loss, and H2 gas collection. Overall, limited galvanic coupling was observed between weld zones resulting in an order of magnitude reduction in galvanic corrosion rate.

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