Characterization of the corrosion behavior of Zn-Al-Mg coated steel under São Paulo acidic rain by Scanning Vibrate Electrode Technique
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2023
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EUROPEAN CORROSION CONGRESS
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Resumo
Smart coatings tailored to enhance the corrosion protection of steel substrates are
the target of the automotive industry, as they ensure the reliability and long-term
performance of coated parts. In this field, galvanized steel progresses through the
last decades entail the development of more durable, reliable, and sustainable anticorrosive coatings, reducing the need for additional corrosion protection on coated
components, while also lowering costs and fuel consumption in automobiles. The
addition of aluminum and magnesium to the zinc bath leads to the formation of
different metallurgical products in the galvanized layer, as well as more compact and
stable corrosion products, increasing the service life of the steel. Also, the addition of
those elements contributes to a self-repairing effect on scratches and at the cut
edges, a crucial region under corrosive agents. In this study, electrochemical
techniques were used to understand the corrosive process that occurs in Zn-3.5%Al3%Mg alloy coated steel (ZM), when exposed to aggressive aqueous electrolytes,
and the differences in its corrosion behavior with respect to conventional galvanized
steels (GI). Besides the conventional polarization analysis, samples of ZM and GI
were investigated by Scanning Vibrate Electrode Technique (SVET), a local probe
technique outstanding in providing information about the corrosive process in situ, on
the micrometer scale. Through SVET, it is possible to visualize the corrosion
progress in terms of identifying anodic and cathodic regions with estimation of the
respective currents and their evolution in space and time. The tests were performed
synthetic acid rain, reproducing the conditions found in the city of São Paulo. The
study was complemented by Scanning Electron Microscope (SEM), Energy
Dispersive X-Ray Analysis (EDX) and Glow-discharge optical emission spectroscopy
(GDOES) analysis, for the identification corrosion products formed after exposure to
the corrosive electrolyte. The superiority of ZM corrosion resistance over GI has been
proven and attributed to the different corrosion products formed by the alloying
elements added to the coating, therefore not observed in the conventional galvanized
steel.
Como referenciar
BOLSANELLO, MARIALIA F.; ABREU, ANDREA; GUEDES, MARIA G.P.; COSTA, ISOLDA; PEREZ, JAVIER I.; ROSSI, JESUALDO L. Characterization of the corrosion behavior of Zn-Al-Mg coated steel under São Paulo acidic rain by Scanning Vibrate Electrode Technique. In: EUROPEAN CORROSION CONGRESS, August 27-31, 2023, Belgium, Brussels. Abstract... Disponível em: https://repositorio.ipen.br/handle/123456789/47996. Acesso em: 20 Mar 2026.
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.