✦ LIBER ✦
Copper behaviour in acid and alkaline brines. II. Formation of a protective layer in slightly alkaline 0.5 M NaCl solutions
✍ Scribed by G. Fiori; S. Casola; G. Faita
- Publisher
- Elsevier Science
- Year
- 1977
- Weight
- 415 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0390-6035
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✦ Synopsis
The behaviour of rotating Cu electrodes in 0.5 M NaC1 solutions has been examined in the pH range from 8 to 9. Free corrosion potential measurements and quasi-stationary current-potential relationships show a clear-cut transition at pH values near 8.5; the rate control on the corrosion process is anyway diffuse both in the prepassivation and in the passivation region.
The current-time behaviour shows that passivation can be caused by the alkalinisation of the solution layer at the interphase or by the attainment of a more noble electrode potential.