A comparative study of the passivation and localized corrosion of α-brass and β-brass in borate buffer solutions containing sodium chloride : III. The effect of temperature
The passivation and localized corrosion of α-brass and β-brass in an aqueous borate-boric acid buffer (pH 9) containing different concentrations of NaCl (c<sub>NaCl</sub>) in the temperature range 5 °C ≤ T ≤ 45 °C were studied comparatively by potential sweeping at 2 × 10<sup>−2<...
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| Autores principales: | , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1998
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/118441 |
| Aporte de: |
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I19-R120-10915-118441 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas Química A. brass C. passive films C. localized corrosion |
| spellingShingle |
Ciencias Exactas Química A. brass C. passive films C. localized corrosion Morales, J. Fernandez, G. T. Gonzales, S. Esparza, P. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge A comparative study of the passivation and localized corrosion of α-brass and β-brass in borate buffer solutions containing sodium chloride : III. The effect of temperature |
| topic_facet |
Ciencias Exactas Química A. brass C. passive films C. localized corrosion |
| description |
The passivation and localized corrosion of α-brass and β-brass in an aqueous borate-boric acid buffer (pH 9) containing different concentrations of NaCl (c<sub>NaCl</sub>) in the temperature range 5 °C ≤ T ≤ 45 °C were studied comparatively by potential sweeping at 2 × 10<sup>−2</sup>Vs<sup>−1</sup> and 2 × 10<sup>−4</sup>Vs<sup>−1</sup> and de-alloying measurements. The passivation of α-brass and β-brass was related to the electroformation of a complex ZnO · xH<sup>2</sup>O/Cu<<sup>2</sup>O layer, its thickness and compactness presumably increasing with temperature. For both α-brass and β-brass immersed in an aqueous NaCl-containing buffer, pitting corrosion was observed as the value of the breakdown potential (E<sub>b</sub>) was exceeded. At constant temperature, the value of E<sub>b</sub> shifted negatively as either cNaCl or the zinc content in the alloy was increased. For β-brass, the value of E<sub>b</sub> decreased slightly with increasing temperature in the range 5 °C≤ T ≤45 °C. In the range 5 °C≤ T ≤ 25 °C, for α-brass the value of E<sub>b</sub> was close to that reported for copper, whereas for T > 25 °C it approached those values measured for β-brass. De-alloying measurements in aqueous 0.5 M NaCl indicate that zinc surface enrichment of α-brass was responsible for the decrease in pitting corrosion resistance at T > 45 °C. |
| format |
Articulo Articulo |
| author |
Morales, J. Fernandez, G. T. Gonzales, S. Esparza, P. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge |
| author_facet |
Morales, J. Fernandez, G. T. Gonzales, S. Esparza, P. Salvarezza, Roberto Carlos Arvia, Alejandro Jorge |
| author_sort |
Morales, J. |
| title |
A comparative study of the passivation and localized corrosion of α-brass and β-brass in borate buffer solutions containing sodium chloride : III. The effect of temperature |
| title_short |
A comparative study of the passivation and localized corrosion of α-brass and β-brass in borate buffer solutions containing sodium chloride : III. The effect of temperature |
| title_full |
A comparative study of the passivation and localized corrosion of α-brass and β-brass in borate buffer solutions containing sodium chloride : III. The effect of temperature |
| title_fullStr |
A comparative study of the passivation and localized corrosion of α-brass and β-brass in borate buffer solutions containing sodium chloride : III. The effect of temperature |
| title_full_unstemmed |
A comparative study of the passivation and localized corrosion of α-brass and β-brass in borate buffer solutions containing sodium chloride : III. The effect of temperature |
| title_sort |
comparative study of the passivation and localized corrosion of α-brass and β-brass in borate buffer solutions containing sodium chloride : iii. the effect of temperature |
| publishDate |
1998 |
| url |
http://sedici.unlp.edu.ar/handle/10915/118441 |
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Repositorios |
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