Passive current density maxima have been observed by various workers during the anodic polarization of different stainless steels in sulfuric acid solutions and have been explained by many theories. This paper describes the precorrosion time and some other pretreatments of the sample surface which change drastically the anodic polarization curve of AISI Type 304 stainless steel in 2N H2SO4, lowering the critical current density and causing two passive maxima. Our results are used in a critical analysis of the conclusions of other authors. The passive current density maxima are attributed to the oxidation of hydrogen formed during precorrosion and absorbed into the alloy and of ions present in the solution and coming from the alloy dissolution.
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1 November 1978
Research Article|
November 01 1978
Contribution to the Interpretation of Current Maxima in the Passivity Range of Austenitic Stainless Steels Available to Purchase
A. Cigada;
A. Cigada
*Centro Studi Processi Elettrodici, C.N.R. Istituto di Elettrochimica, Chimica-Fisica e Metallurgia del Politecnico di Milano, Milan,
Italy
.
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G. Re;
G. Re
*Centro Studi Processi Elettrodici, C.N.R. Istituto di Elettrochimica, Chimica-Fisica e Metallurgia del Politecnico di Milano, Milan,
Italy
.
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D. Sinigaglia;
D. Sinigaglia
*Centro Studi Processi Elettrodici, C.N.R. Istituto di Elettrochimica, Chimica-Fisica e Metallurgia del Politecnico di Milano, Milan,
Italy
.
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F. Borile
F. Borile
**Laboratorio Materiali Metallici non Tradizionali, C.N.R. Cinisello Balsamo, Milan,
Italy
.
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Received:
April 01 1977
Online ISSN: 1938-159X
Print ISSN: 0010-9312
© 1978 National Association of Corrosion Engineers
1978
CORROSION (1978) 34 (11): 407–412.
Article history
Received:
April 01 1977
Connected Content
This is a correction to:
Stress Corrosion Studies on Some Stainless Steels in Elevated Temperature Aqueous Environments✫
Citation
A. Cigada, G. Re, D. Sinigaglia, F. Borile; Contribution to the Interpretation of Current Maxima in the Passivity Range of Austenitic Stainless Steels. CORROSION 1 November 1978; 34 (11): 407–412. https://doi.org/10.5006/0010-9312-34.11.407
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