Influence of the Alusi® coating on corrosion resistance of press hardened steel
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2018
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23.
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Resumo
Press hardened steels (PHS) have been used in the last decades by automotive
industries to aggregate the improvement of vehicle safety with the reduction of its
heavy, also reducing CO2 emissions. This material category, also called ultrahigh
strength boron manganese steels, is capable to succeed hot stamping process, a
development of the cold stamping process, that avoids spring back and allows the
attainment of complex geometries. Hot stamping process consists basically on heating
a steel blank until its austenitization, transferring it to press tooling, forming and
quenching it to fully martensitic transformation. Besides all the advantages in the final
product, the step consisted in the transference from the furnace to the press is critical
for the steel, once the absence of a protective atmosphere might promote deleterious
steel oxidation. To solve this problem, ArcelorMittal developed a precoated boron steel,
with aluminum-silicon metallic coating, named Alusi®. The addition of this metallic
layer prevents steel oxidation and peeling, however laboratorial tests indicated that the
coating addition affects mechanical properties of the steel substrate, requiring special
cares during conformation process. When submitted to elastic deformation, extensive
cracks can form in the coating, and affect the corrosion resistance of the steel. To
investigate the influence of the Alusi® coating on ultrahigh strength boron manganese
steel corrosion resistance, samples of this material were analyzed with and without the
coating, and results obtained were compared to evaluate the interference of the
coating on the corrosion process. The tests include open circuit potential
measurement, to compare the stabilization of the steel with and without the coating;
electrochemical impedance spectroscopy, to compare the effectiveness of the
corrosion resistance; and immersion trials, interrupted every two hours in order to
monitor the formation of corrosion products. The results obtained for the two groups of
samples were compared, to weigh the advantages and disadvantages of using the
Alusi® on hot stamping process.
Como referenciar
BOLSANELLO, M.F.; ARAUJO, J.V.S.; COSTA, I.; ROSSI, J.L. Influence of the Alusi® coating on corrosion resistance of press hardened steel. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... p. 5183-5183. Disponível em: http://repositorio.ipen.br/handle/123456789/29573. Acesso em: 24 Apr 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.