1. Near-surface solution pH measurements during the pitting corrosion of AISI 1020 steel using a ring-shaped sensor
- Author
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Marina Medina da Silva, Lucia H. Mascaro, Ernesto C. Pereira, and Alexsandro Mendes Zimer
- Subjects
Aqueous solution ,Passivation ,Chemistry ,General Chemical Engineering ,Metallurgy ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Analytical Chemistry ,law.invention ,Corrosion ,Metal ,Optical microscope ,law ,visual_art ,Basic solution ,Electrochemistry ,visual_art.visual_art_medium ,Pitting corrosion ,Composite material ,0210 nano-technology ,Glass tube - Abstract
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) during pitting 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.
- Published
- 2016
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