TY - JOUR
T1 - Characterization of different allotropic forms of calcium carbonate scales on carbon steel by electrochemical impedance spectroscopy
AU - Marín-Cruz, J.
AU - Cabrera-Sierra, R.
AU - Pech-Canul, M. A.
AU - González, I.
PY - 2004/3
Y1 - 2004/3
N2 - Calcium carbonate scales with allotropic forms of aragonite, calcite and a mixture of both, were selectively induced onto carbon steel substrates in a synthetic cooling water. Electrochemical impedance spectroscopy (EIS) was successfully applied to characterize these scales. The resistance and capacitance of the high frequency loop of impedance diagrams for the aragonite and aragonite-calcite scales were related to the morphology of the deposits, and gave information which is in good agreement with scanning electron microscopy (SEM) observations. The impedance response of the scale with a calcite-aragonite mixture was dominated by the aragonite constituent. However, the calcite constituent has a strong influence on the scale morphology, so that the calcite crystals merged laterally with the aragonite agglomerates to form a more coherent and thicker scale, compared to that for a scale consisting of aragonite alone. For scales containing aragonite and a calcite-aragonite mixture, increasing the formation time lead to less porous and thicker deposits.
AB - Calcium carbonate scales with allotropic forms of aragonite, calcite and a mixture of both, were selectively induced onto carbon steel substrates in a synthetic cooling water. Electrochemical impedance spectroscopy (EIS) was successfully applied to characterize these scales. The resistance and capacitance of the high frequency loop of impedance diagrams for the aragonite and aragonite-calcite scales were related to the morphology of the deposits, and gave information which is in good agreement with scanning electron microscopy (SEM) observations. The impedance response of the scale with a calcite-aragonite mixture was dominated by the aragonite constituent. However, the calcite constituent has a strong influence on the scale morphology, so that the calcite crystals merged laterally with the aragonite agglomerates to form a more coherent and thicker scale, compared to that for a scale consisting of aragonite alone. For scales containing aragonite and a calcite-aragonite mixture, increasing the formation time lead to less porous and thicker deposits.
KW - Aragonite
KW - Calcite
KW - Calcium carbonate scales
KW - Carbon steel
KW - Electrochemical impedance spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=1542471508&partnerID=8YFLogxK
U2 - 10.1023/B:JACH.0000015648.68779.c6
DO - 10.1023/B:JACH.0000015648.68779.c6
M3 - Artículo
SN - 0021-891X
VL - 34
SP - 337
EP - 343
JO - Journal of Applied Electrochemistry
JF - Journal of Applied Electrochemistry
IS - 3
ER -