Acta Metallurgica Sinica (English Letters) >
Influence of Temperature on the Protectiveness and Morphological Characteristics of Calcareous Deposits Polarized by Galvanostatic Mode
Received date: 2013-05-22
Revised date: 2013-09-12
Online published: 2014-03-11
The influence of temperature on calcareous deposits formed under galvanostatic polarization mode was studied. The deposition was monitored by electrochemical impedance spectrum, and a supplementary loop in Nyquist diagram at high frequency was found to be an indicator of deposits precipitation with sufficient protection at above 20 °C. An exponential increase of protectiveness with temperature was observed, which was quantified by linear polarization resistance technique. Observation by scanning electron microscope and X-ray diffraction analyses demonstrated that the critical temperature of calcium carbonate crystal form transition ranged from 15 to 20 °C. Calcite formed below 15 °C, while aragonite precipitated at above 20 °C.
Key words： Calcareous deposits; Temperature; Galvanostatic; Cathodic protection
Chengjie Li , Min Du , Jing Qiu , Jing Zhang , Congjie Gao . Influence of Temperature on the Protectiveness and Morphological Characteristics of Calcareous Deposits Polarized by Galvanostatic Mode[J]. Acta Metallurgica Sinica (English Letters), 2014 , 27(1) : 131 -139 . DOI: 10.1007/s40195-013-0010-6
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