Electrochemical behaviour of 22MnB5 steel coated with hot-dip Al-Si before and after hot-stamping process investigated by means of scanning Kelvin probe microscopy. (September 2020)

• Record Type: Journal Article
• Authors: Couto, Camila Pucci; Revilla, Reynier I.; Colosio, Marco Antonio; Costa, Isolda; Panossian, Zehbour; De Graeve, Iris; Terryn, Herman; Rossi, Jesualdo Luiz
• Is Part Of: Corrosion science. Volume 174(2020)
• Publication Date: 2020-09
• Subjects: hot stamping -- Hot-dip Al-Si -- Galvanic coupling -- Electrochemical behaviour -- SKPFM; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.108811
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Local electrochemical behaviour of multilayer coating was characterized by SKPFM. Influence of hot stamping on the galvanic coupling (coating/steel) was investigated. Both coating layer and steel substrate became nobler after hot stamping. The hot-stamping process decreased the driving force for cathodic protection A concurrent mechanism was thoroughly established. Abstract: Press-hardened steels are commonly protected with hot-dip Al-Si coating. Due to the electrochemical complexity of this system, either before or after hot-stamping process, SKPFM was used to investigate the influence of the thermo-mechanical process on the electrochemical behaviour of the galvanic coupling. The hot-stamping process changed significantly the anodic/cathodic coupling of the coating/steel due to iron enrichment in the coating layer. Hence, a concurrent mechanism was thoroughly established, i.e., while the press hardening enhances the corrosion properties of the steel system (steel and metallic coating) through diffusion, at the same time it diminishes the cathodic protection of the Al-Si layer.