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Liquid dispersed in the sand / water / metal multiphase system the role of the corrosion process

Author: WangWeiWei
Tutor: WangJia
School: Ocean University of China
Course: Applied Chemistry
Keywords: Liquid state Three phase boundary Cathodic behavior Corrosion Behavior
CLC: TG172
Type: Master's thesis
Year: 2008
Downloads: 30
Quote: 0
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Abstract


Soil and concrete metal corrosion phenomenon is the recent erosion of our natural environment, the main research object. Liquid in the soil and concrete corrosion system was highly decentralized state , the metal surface is not continuous distribution of the electrolyte . Gas and solid impact also depends on the relative corrosion behavior of both the degree of dispersion of the liquid form , depending on the degree of dispersion and liquid water content . The corrosion process gas / liquid and liquid / solid interface area dissolution , diffusion and transformation process depends water content changes. To this end , the subject started a liquid dispersion and three phase boundary properties on the corrosion behavior of highly dispersed multiphase system and its mechanism of action . Mainly studied the sand / water dispersion system moisture , sand particle size , water salinity and metal materials for the cathode behavior and corrosion behavior and mechanism . In this paper, using the polarization curves and electrochemical impedance method to study the sand / water / steel multiphase system cathodic limiting diffusion current with changes in moisture content and its mechanism of action, and to study the sand particle size , electrode materials , salt type and concentration on the cathode of the system behavior and corrosion Behavior of the cathode . Obtain the following findings . ( 1) The sand / water / Steel system, the main features of cathodic processes with the increase of water content in the cathodic limiting diffusion current is relatively saturated water content of 60% there is a great value , the polarization resistance is minimized at 60% values. ( 2 ) established a three phase boundary in the sand / water / metal dispersion corrosion system the role of the physical model , according to this model explains the sand / water / steel system behavior and the corrosion behavior of the cathode water content maxima phenomenon . ( 3 ) sand particle size , type and concentration of salt , steel types have varying degrees of sand / water / Steel system behavior and the corrosion behavior of the cathode , but does not change the water content in the electrode Behavior of the maximum value appears phenomenon was confirmed phase dispersion in multiphase system corrosion behavior of an important role.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Various types of metal corrosion
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