ISSN:
1572-8838
Schlagwort(e):
benzotriazole
;
copper
;
corrosion
;
mass-transfer coefficient
;
rotating-disk electrode
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
,
Elektrotechnik, Elektronik, Nachrichtentechnik
Notizen:
Abstract The effect of benzotriazole, BTA, on mass transfer in dissolution-corrosion of the copper rotating disk electrode in 0.02 M Fe(III)–0.5 M H2SO4 has been studied by means of atomic absorption spectrometry. The mass transfer coefficient, K, was determined from the slope of ln(C 0/C)Fe(III) vs. time plots. In the absence of BTA the corrosion process can be described by the correlation Sh = KR/D = 4.47Re 0.5. The difference in values between Sh and Sh Levich, and the change in slope in the Arrenhius plot points to mixed control for the cathodic process Fe3+ + 1e− → Fe 2+ and charge transfer control for the anodic process, Cu → Cu2+ + 2e. The average activation energies were 7.7 kJ mol−1 and 19.5 kJ mol−1 at (500–1500) and (2000–3000) rpm, respectively. At low concentration of BTA the inhibiting action of BTA increases with concentration and with rotation speed. For [BTA] ≥ 5 × 10−3 M, the K value, 10−4 cm s−1, remains constant and is independent of rotation rate. The morphology of the copper rotating disk after corrosion in the absence and presence of BTA was examined using scanning electron microscopy (SEM).
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1003981509603
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