A10 Cathodic Protection .ppt

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  Paint School JPS-E/Cathodic/1 Organisation Chart   Jotun Cathodic Protection JotunCathodicProtection JotunDecorative(Scandinavia)JotunProtectiveCoatingsJotunDecorativePaintsJotunMarineCoatings JotunPaints JotunPowder Coatings Jotun Group  Paint School JPS-E/Cathodic/2 Corrosion of a metal or alloy ã Corrosion is a reaction between the metal and the surrounding environment ã The corrosion rate depends on the properties of the metal and the corrosivity of the environment. ã Corrosion is dissolution of the metal, among other things involving the release of electrons:Fe Fe + 2e 2+  Paint School JPS-E/Cathodic/3 What is cathodic protection ? ã Cathodic protection (CP) is a method for reducing the corrosion rate of a metal. ã  The principle is based on “Supplying electrons to the base material”. ã This is done by either:  –  Connecting the structure to a more electro-negative material (Sacrificial anode)  –  Connecting the structure to an external electron source (Impressed current)  Paint School JPS-E/Cathodic/4 How to protect a structure Corrosion Protection can be achieved by : ã Sacrificial Anode Cathodic Protection System ã Impressed Current Cathodic Protection SystemBoth systems supply electrons to the structure.The structure will become more negative and metal dissolution will be prevented
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