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24 Cards in this Set
- Front
- Back
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The process by which electrons are added or removed from atoms or molecules, creating ions.
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Ionization
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Electric current flow through a metal where no obvious chemical change is observed.
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Metallic Conduction
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The measure of the ability of a substance to allow current flow
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Conductivity
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The deterioration of a material due to interaction with its environment.
A refined metal returning to its unrefined state. |
Corrosion
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Decomposition of a substance by electric current.
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ELECTROLYSIS
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A fluid that conducts electricity.
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ELECTROLYTE
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The movement of ions through an electrolyte.
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ELECTROLYTIC CONDUCTION
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The process whereby the surface of a metal undergoes a slow, relatively uniform, removal of metal.
Infinite number of micro cells on the surface of the metal Oxidation occurs on anodic areas, reduction on cathodic areas Uniform attack on the metal surface |
General Corrosion
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Electrodes or micro-electrodes of two different substances.
Anode (negative) Electrolyte (positive) |
Electrochemical Cells
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Anode is ____
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Negative
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Electrolyte is ____
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Positive
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A chemical process in which electrons are given up and positive ions are formed.
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Oxidation
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A chemical process in which electrons are gained by a positive ion.
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Reduction
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chemical inactivity, especially the resistance to corrosion of certain metals when covered with a coherent oxide layer.
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Passivity
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the complete discharge of the voltage potential of an electrochemical cell
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Polarization
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Condtitions that contribute to the general corrosion
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Metal and water in same environment
Chemical reaction between them forming oxide |
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Three products of general corrosion of Iron
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Ferrous Oxide (FeO)
Crystalline state of oxygen and iron (Fe3O4) Ferric Oxide (Fe2O3) |
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Chalk River Unidentified Deposits
Early Canadian research reactor site Finely divided, insoluble oxide particles from metal corrosion |
Crud
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Sudden increase in coolant radioactivity due to a release of crud into the coolant.
Causes: Rise in oxygen concentration Lower pH Significant temperature change Physical shock |
Crud Burst
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Corrosion byproduct
Surface deposits from formation of insoluble compounds from soluble salts Calcium Carbonate (CaCO3) Magnesium Carbonate (MgCO3) Chemically treat CWS to prevent scale inside Main Condenser tubes. |
Scale
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Corrosion that results when two dissimilar metals with different potentials are placed in electrical contact in an electrolyte
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Galvanic Corrosion
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Anodic site fixed in a small area producing deep holes (pits).
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Pitting
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A type of pitting corrosion occurring in the low flow areas created by crevices.
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Crevice
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Intergranular corrosion that occurs at grain boundaries under tensile stress.
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Stress Corrosion Cracking
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