Abstract
Laser processing parameters of an ytterbium fiber laser were explored using a two-stage searching strategy to form an optimum surface layer on Fe-14Cr ferritic alloy samples for improved corrosion performance. With one or two passes of laser surface scanning, corrosion behavior and surface layer uniformity were investigated for different laser parameters utilizing energy-dispersive X-ray spectroscopy (EDS) and electrochemical tests in saltwater. The optimum laser processing parameters were found to be 175 w of laser power, 200 mm/s of scanning speed, and 0.025 mm of hatching space. Corrosion behavior of laser-treated samples with the optimum laser parameters was found to be 5 and 13 times better respectively than the baseline sample in 3.5 wt% NaCl water solution, in term of corrosion rate. The formation of a uniform thin oxidation layer was the main reason for the improved corrosion performance.
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