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Effect of Hydrostatic Pressure and Alternating Pressure on Degradation of Epoxy Coating

Author: LiuHaoYu
Tutor: WangFuHui
School: Harbin Engineering University
Course: Materials Science
Keywords: Epoxy coating Hydrostatic pressure Alternating pressure Electrochemical impedance spectroscopy Failure process
CLC: TG172
Type: Master's thesis
Year: 2010
Downloads: 50
Quote: 0
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Abstract


Metal material corrosion damage can easily occur in the deep-sea environment , organic coating is to prevent a major means of protection against metal corrosion . Electrochemical impedance spectroscopy (EIS) can get rich electrochemical organic coatings and metal corrosion coating , which is widely used in the study of the protective properties of the organic coating system . The water pressure is an important factor influencing the material corrosion failures in the deep-sea environment . In this thesis, using electrochemical impedance spectroscopy to study two commonly used epoxy coating system failure process as well as the corrosion behavior of the metal coating under hydrostatic pressure and alternating pressure , and the combination of the coating water absorption and adhesion with the the time variation of hydrostatic pressure and alternating pressure on the properties of the coating , and the coating failure behavior . The experimental results showed that the hydrostatic pressure of the electrolyte solution to the coating within the penetration accelerating ; compared with atmospheric pressure , the coating under hydrostatic pressure resistance decreases, the barrier effect of the coating on the particles of water, oxygen and other erosion weakened coating failure process faster ; smaller charge transfer resistance of the coating / metal interface , metal corrosion reaction at the interface faster , coating metal substrate is more prone to corrosion and deterioration of the protective properties of the coating . Alternating pressure pressurized coating performance is significantly reduced, the coating of metal corrosion . Corrosion reaction occurs after the change of coating properties as well as metal corrosion with a certain periodicity, pressure compared with atmospheric pressure , coating properties deteriorate rapidly, accelerated corrosion reaction . Coating under hydrostatic pressure and alternating pressure water absorption increases with time , the coating adhesion is decreased over time , coating performance is gradually reduced .

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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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