Influence of heat treatment on corrosion resistance of press hardened steel coated with AlSi and ZnNi
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2017
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EUROPEAN CORROSION CONGRESS; INTERNATIONAL CORROSION CONGRESS, 20th; PROCESS SAFETY CONGRESS
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Resumo
The ultrahigh strength boron manganese steels, also known as PHS (press hardened steels), are strategic
materials for the automotive industry, satisfying safety needs and fuel reduction requirements by means of
the lightweight design concept, a current trend for new vehicles. It is possible by the hot stamping process
which consists in heating a steel blank to the austenitization temperature, transferring it to press tooling,
forming and quenching to fully martensitic transformation. At the end of process, the steel achieves tensile
strength up to 1,500 MPa. The transference step from furnace to press is a critical stage because it might
promote deleterious steel oxidation. The use of metallic coatings avoids this outcome. AlSi coatings have
been the most applied on PHS. Alternative coatings such as electroplated ZnNi are under investigation to
evaluate their potential for replacement of AlSi coatings, besides to keep up with the high projected world
demand. Zinc based coatings are advantageous comparatively to AlSi ones because they provide cathodic
protection to steel substrates. In this study the influence of hot stamping heat treatment on corrosion
resistance of 25MnB5 steel coated by AlSi and electroplated ZnNi has been investigated. The tests include
open circuit potential measurement, electrochemical impedance spectroscopy and anodic polarization
curves. The samples have been tested as received and after the heat treatment which consists in heating the
sample at 900°C by 10 minutes and then, fast cooling in water. It is expect that the heat treatment changes
the corrosion resistance due to the intermetallics formation at the coating layer as a consequence of
diffusion.
Como referenciar
COUTO, CAMILA P.; COSTA, ISOLDA; COLOSIO, MARCO; GOMES, MAURILIO; ROSSI, JESUALDO; BOLSANELLO, MARILIA. Influence of heat treatment on corrosion resistance of press hardened steel coated with AlSi and ZnNi. In: EUROPEAN CORROSION CONGRESS; INTERNATIONAL CORROSION CONGRESS, 20th; PROCESS SAFETY CONGRESS, September 3-7, 2017, Prague, Czech Republic. Abstract... Frankfurt, Germany: European Federation of Corrosion, 2017. Disponível em: http://repositorio.ipen.br/handle/123456789/31206. Acesso em: 11 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.