INVESTIGADORES
CALVO Ernesto Julio
artículos
Título:
Precursor sites for localised corrosion on lacquered tinplates visualised by means of alternating current scanning eletrochemical microscopy
Autor/es:
BALLESTEROS KATEMANN, B.; GONZÁLEZ INCHAUSPE, C.; P.A. CASTRO,; A. SCHULTE,; ERNESTO JULIO CALVO; W. SCHUMANN,
Revista:
ELECTROCHIMICA ACTA
Referencias:
Año: 2003 vol. 48 p. 1115 - 1121
ISSN:
0013-4686
Resumen:
In solutions of low conductivity and at high frequencies the impedance of a SECM tip-auxiliary electrode cell is dominated by the
solution resistance between the tip and counter electrode. Alternating current scanning electrochemical microscopy (AC-SECM)
utilises the effect of an increasing (decreasing) solution resistance as the SECM tip approaches an insulator (conductor) for mapping
domains of different conductivity/electrochemical activity on surfaces immersed into electrolytes. In the present study, we employed
AC-SECM in aqueous solutions to evaluate the integrity of the solid/liquid interface of lacquered tinplates as commonly used in
industry to manufacture, i.e. food cans. Significant differences were determined between the AC response and the phase shift
measured with the SECM tip above the intact coating and above defects where the surface of the steel base is exposed. This allowed
with high lateral resolution to detect and to visualise artificial micro cavities which we consider as an experimental model of
microscopically small precursor sites for localised corrosion.vity and at high frequencies the impedance of a SECM tip-auxiliary electrode cell is dominated by the
solution resistance between the tip and counter electrode. Alternating current scanning electrochemical microscopy (AC-SECM)
utilises the effect of an increasing (decreasing) solution resistance as the SECM tip approaches an insulator (conductor) for mapping
domains of different conductivity/electrochemical activity on surfaces immersed into electrolytes. In the present study, we employed
AC-SECM in aqueous solutions to evaluate the integrity of the solid/liquid interface of lacquered tinplates as commonly used in
industry to manufacture, i.e. food cans. Significant differences were determined between the AC response and the phase shift
measured with the SECM tip above the intact coating and above defects where the surface of the steel base is exposed. This allowed
with high lateral resolution to detect and to visualise artificial micro cavities which we consider as an experimental model of
microscopically small precursor sites for localised corrosion.vity/electrochemical activity on surfaces immersed into electrolytes. In the present study, we employed
AC-SECM in aqueous solutions to evaluate the integrity of the solid/liquid interface of lacquered tinplates as commonly used in
industry to manufacture, i.e. food cans. Significant differences were determined between the AC response and the phase shift
measured with the SECM tip above the intact coating and above defects where the surface of the steel base is exposed. This allowed
with high lateral resolution to detect and to visualise artificial micro cavities which we consider as an experimental model of
microscopically small precursor sites for localised corrosion.valuate the integrity of the solid/liquid interface of lacquered tinplates as commonly used in
industry to manufacture, i.e. food cans. Significant differences were determined between the AC response and the phase shift
measured with the SECM tip above the intact coating and above defects where the surface of the steel base is exposed. This allowed
with high lateral resolution to detect and to visualise artificial micro cavities which we consider as an experimental model of
microscopically small precursor sites for localised corrosion.ve the intact coating and above defects where the surface of the steel base is exposed. This allowed
with high lateral resolution to detect and to visualise artificial micro cavities which we consider as an experimental model of
microscopically small precursor sites for localised corrosion.visualise artificial micro cavities which we consider as an experimental model of
microscopically small precursor sites for localised corrosion.