Near-surface solution pH measurements during the pitting corrosion of AISI 1020 steel using a ring-shaped sensor

Autor(es)

da Silva, Marina Medina ; Mascaro, Lucia Helena ; Pereira, Ernesto Chaves ; Zimer, Alexsandro Mendes

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ELECTROANALYTICAL CHEMISTRY; v. 780, p. 7-pg., 2016-11-01.

Resumo

This work presents the development and characterization of a ring-shaped sensor built around a steel sample (AISI 1020) to determine the near-surface solution pH (NSSpH) duringpitting corrosion. The pH sensor is constituted by a ring of IrOx, a material that is sensitive to pH changes, synthesized using the Pechini method on a glass tube with a gap of 1 mm between the pH. sensor (ring) and the metal sample (disc). The evolution of the corrosion process was also followed using a temporal series of micrographs with an optical microscope. At the same time, the sensor followed the NSSpH during the passivation of the metal, during the breakdown of the passive film, and during the pit evolution in an aqueous basic solution containing HCO3- and Cl- species. When the pit potential was reached, the NSSpH was reduced by one pH unit. (C) 2016 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 11/19430-0 - Investigação in situ da corrosão do aço carbono por meio de series temporais de imagens acoplada a técnicas eletroquímicas
• Beneficiário: Alexsandro Mendes Zimer
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/13503-0 - Desenvolvimento de sensor para determinação de pH interfacial durante a corrosão puntiforme observada in situ por serie temporal de imagens
• Beneficiário: Marina Medina da Silva
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs