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- Title
CORROSÃO POR PITE EM CONDIÇÃO EROSIVA DA LIGA CU 10NI-3AL-1,3FE ENVELHECIDA A 550°C, EM MEIO CONTENDO SULFATO.
- Authors
Liberto, Rodrigo Nascimento; Magnabosco, Rodrigo; Alonso-Falleiros, Neusa
- Abstract
This study evaluates the effect of aging at 550°C on pitting corrosion of Cu 10Ni-3AI-1.3Fealloy, after potentiodynamic polarization test in 0.01 M Na2SO4 in erosive condition. Cold rolled sheet specimens were solution treated at 900°C for 1 hour, and aged at 550°C until 1,032 hours. The investigation was carried out by potentiodynamic polarization in electrolyte consisted of 0.01 M Na2SO4 with 10 wt. (%) of Al2O3 abrasive particles. After the polarization tests, specimens were analyzed by optical microscopy and scanning electron microscopy techniques to examine the morphology of the corroded regions. Result show that all samples present a passivity break potential (Eq) that characterizes the initiation of pitting corrosion. However, it is not observed any significant change in the value of passivity break potential as a function of aging time. The mechanism of pitting corrosion in the studied alloys can be the passivity breakdown by the action of sulfate ion, followed by growth of pit by galvanic action or dissolution of the copper in cupric and cuprous ions and membrane formation of cuprous oxide over the pit.
- Subjects
PITTING corrosion; IONS; COPPER; ALLOYS; OPTICAL polarization; MICROSCOPY; ELECTROLYTES; SCANNING electron microscopy
- Publication
Tecnologia em Metalurgia, Materiais e Mineração, 2012, Vol 9, Issue 3, p173
- ISSN
2176-1515
- Publication type
Article
- DOI
10.4322/tmm.2012.025