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Titolo:
CORROSION AND PASSIVATION OF TIN ANODE IN NA2CO3 SOLUTIONS AND THE EFFECT OF HALIDE-IONS
Autore:
ELREHIM SSA; TAHA F; SALEH MB; MOHAMED SA;
Indirizzi:
AIN SHAMS UNIV,FAC SCI,DEPT CHEM CAIRO EGYPT MENIA UNIV,FAC SCI,DEPT CHEM MENIA EGYPT
Titolo Testata:
Collection of Czechoslovak Chemical Communications
fascicolo: 9, volume: 58, anno: 1993,
pagine: 2013 - 2020
SICI:
0010-0765(1993)58:9<2013:CAPOTA>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
SODIUM-HYDROXIDE SOLUTIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
20
Recensione:
Indirizzi per estratti:
Citazione:
S.S.A. Elrehim et al., "CORROSION AND PASSIVATION OF TIN ANODE IN NA2CO3 SOLUTIONS AND THE EFFECT OF HALIDE-IONS", Collection of Czechoslovak Chemical Communications, 58(9), 1993, pp. 2013-2020

Abstract

The corrosion and passivation of tin anode in Na2CO3 (0.01 to 1.0 M) was investigated using potentiodynamic and cyclic voltammetry techniques and complemented by X-ray and scanning electron microscopy. The polarization curves exhibit two anodic peaks assigned to the electroformation of Sn(II) and Sn(IV) species, respectively, prior to permanent passive region. The anodic dissolution reactions are controlled by diffusion. X-Ray diffraction showed that the permanent passive layer is duplex and consists of SnO and SnO2. A multiplicity of cathodic peaks is related to the electroreduction of the anodically formed compounds. Addition of Cl-, Br- or I- ions into the carbonate solutions enhances the anodic dissolution of tin to some extent depending upon the sodium carbonate concentration. In the passive region, addition of the halide ions causes pitting corrosion at a critical pitting potential. The pitting potential decreases with increasing both the halide ion concentration and the scanning rate but increases with increasing the sodium carbonate concentration. SEM examination confirms the occurance of pitting corrosion.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 21/09/20 alle ore 05:35:55