Laser Welding Influence on Corrosion Rate of Galvanized Sheets of DP600 Automobilistic Alloy

Abstract:

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^-1, calculated as the ratio between the laser beam power [W] and the scanning speed [mm s^-1]. 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.

• Periodical: Materials Science Forum (Volume 1012)
• Pages: 436-440
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.1012.436
• Online since: October 2020
• Authors: Viviane Teleginski Mazur, Sílvia Rosa Nascimento, Marilei de Fátima Oliveira, Willer Cézar Braz, Correard Gilson Carlos de Castro, Milton Sergio Fernandes Lima, Maurício Marlon Mazur
• Keywords: Advanced High-Strength Steel, Corrosion, Dual-Phase Steel, Laser Welding

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