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Study of Preparation and Corrosion Property of Glass-ceramic Coating on the Metal Surface

Author: ChenPingHu
Tutor: QiuChangJun
School: Nanhua University
Course: Mechanical Manufacturing and Automation
Keywords: glass ceramic coating Thermal spraying technology Corrosion resistance Bonding strength Wetting behavior
CLC: TG174.45
Type: Master's thesis
Year: 2013
Downloads: 104
Quote: 0
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Abstract


This paper mainly through experimental method to study on corrosion propertiesof glass-ceramic coatings in resistance to liquid solution.Under the presentexperimental conditions, preparation the different mass ratio of glass coated ceramiccomposite powder; Using conventional oxygen-acetylene thermal spray technologypreparation glass ceramics coating under the304stainless steel flat plate specimens.Study on Corrosion Behavior of various ratio of coating specimens usingimmersion corrosion method and electrochemical corrosion method, and test thebonding strength of the specimens before and after corrosion，select the bestcomprehensive properties of ratio coating. In addition, the author of this articlecombined Hunan graduate research and innovation projects of Independentdeclaration which study a preliminary experimental that resist to liquid plumbumwetting characteristics at the conditions of different temperatures and differentholding time.Research results that the paper obtained are as follows:1、 Glass-ceramic composite powder of good corrosion resistance and thethermal-expansion coefficient adjustable are prepared by the methods of hightemperature sintering and ball grinding, then the composite powder of doubleexcellent performance with balanced system of glass powder and ceramic powdersystem are obtained.2、Glass-ceramic coatings of three different proportion72mass.-%Cr2O3（serialnumber1#）、54mass.-%Cr2O3（serial number2#）、36mass.-%Cr2O3（serial number3#） whose thickness is200±50μm are prepared by thermal spraying technology.The softening point of the glass glazes is low,so it can achieve a sealing effect by thethermal spraying.It can increase the bonding strength of the coating and the substrate, coating and coating,and it also can improve the the smoothness of coating surfaceand compactness of coating.3、 Extensive experimental results show that corrosion resistance of54mass.-%Cr2O3composite coating is better than the other，The experiment of thecorrosion behavior of glass-ceramic coating are done by the Immersion corrosion testand electrochemical corrosion method.Analyse of the chemical compositions of singleand composite powders by means of XRD(X-Ray Diffraction),and characterizecoating surfaces before and after its corrosion with the help of SEM(ScanningElectron Microscope).4、The1#composite coating specimen’s wetting properties, which was tested inthe self-made experimental devices with the conditions of different heavy metal massand different temperature.The experimental results show that：Different heavy metalmass in the case of other conditions are the same, the small mass has a big wettingangle;The same heavy metal mass has a different wetting angle in differenttemperature conditions,and the higher the temperature,the more intense reaction ofdroplets.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Inorganic complex layer of protection
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