Laser welding of galvanized high strength low alloy (HSLA) steels leads to the evaporation of zinc at the weld and the formation of a heat-affected-zone (HAZ). High heat input due to welding generates macro galvanic coupling between the weld and the parent metal as well as micro galvanic corrosion at different microstructures of the weld, HAZ and the parent metal. Different microstructural substructures exhibit different electrochemical characteristics, potentially leading to microgalvanic corrosion when exposed to an aggressive electrolyte. One of the main aims of this project is to study the effect of laser welding parameter settings on the corrosion behaviour of galvanized steels. It is also important to understand the corrosion behaviour after the zinc coating is consumed or damaged. Therefore, the corrosion mechanisms in and without the presence of the zinc coating have been extensively investigated.
Microgalvanic corrosion of laser-welded HSLA steels
Über die mikrogalvanische Korrosion von lasergschweißten HSLA Stählen
2008
149 Seiten, 11 Bilder, 2 Tabellen, 18 Quellen
Theses
English
Automobilbau , Blase (Fehler) , chemische Zusammensetzung , Delaminierung (Schichtablösung) , elektrisches Potenzial , elektrochemische Eigenschaft , elektrochemische Korrosion , energiedispersive Röntgenspektrometrie , energiedispersive Spektrometrie , hochfester niedrig legierter Stahl , Kaltverfestigen , Korrosion , Korrosionsprüfung , Korrosionsverhütung , Laserschweißen , Mikrostruktur , Polymerbeschichtung , Rasterelektronenmikroskopie , Schichtdicke , Schichtdickenmessung , Schweißmaterial , Schweißnaht , Schweißnahtform , Versuchsaufbau , Wärmeeinflusszone , verzinktes Blech , anodische Auflösung , Kornausbildung
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