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Mazur, Maurício Marlon
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article
Laser Welding Influence on Corrosion Rate of Galvanized Sheets of DP600 Automobilistic Alloy
Abstract
<jats:p>Corrosion rate behavior of laser welded dual-phase galvanized steel, DP 600, has been assessed in comparison with the material without the laser weld, in 3.5% NaCl solution. Three combinations of both scanning speed and laser power parameters were selected, maintaining the thermal input of 30 J mm<jats:sup>-1</jats:sup>, calculated as the ratio between the laser beam power [W] and the scanning speed [mm s<jats:sup>-1</jats:sup>]. The corrosion studies included measurements of open circuit potential, micro and macro polarization, showing higher corrosion rates as scanning speed decreased. Optical microscopy showed the formation of a grain size refined morphology in the heat affected zone and fusion zone. A mechanism has been proposed to explain the corrosion behavior as a function of the laser parameters, which dictated the galvanized coating vaporization.</jats:p>