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23 Cards in this Set
- Front
- Back
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Corrosion that occurs when different metals are in contact with each other and an electrolyte?
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Galvanic
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Corrosion that is an extremely localized attack and results in holes in the metal?
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Pitting
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Corrosion on the grain boundaries of the metal?
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Intergranular
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An advanced form of intergranular corrosion where the surface grains of the metal are lifted up by the force of expanding corrosion products occurring at the grain boundaries?
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Exfoliation
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What is a form of crevice corrosion that occurs on metal surfaces having a thin organic protective coating?
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Filiform
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What is the intergranular or transgranular cracking of a metal caused by the combined effects of constant tensile stress and corrosion?
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Stress corrosion
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What is the cracking of metals caused by the combined effects of cyclic stress and corrosion?
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Corrosion fatigue
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What corrosion occurs at contact areas between materials under load subject to repeated vibration?
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Fretting corrosion
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What is Corrosion?
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The electrochemical deterioration of a material or its properties due to its chemical reaction with the surrounding environment.
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What is the natural occurring state of corrosion?
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usually oxide or sulfide ores
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What kind of corrosion products do aluminum and magnesium form?
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White oxides or hydroxide
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When can corrosion occur in the absent of water?
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High temps.
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What is the most common form of corrosion?
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Electrochemical corrosion
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What is a negatively charged subatomic particle?
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Electron
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What is an atom or group of atoms or molecules which have acquired a net electric charge by gaining or losing electrons?
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Ion
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What is an electrolyte?
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A liquid, usually water, that contain ions.
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What are the four conditions that must exist for corrosion to occur?
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1. A metal which has a tendency to corrode must be present.
2. A dissimilar conductive material which has less tendency to corrode than the anode must be present. 3. A conductive liquid must connect the anode and cathode. 4. Electrical contact between the anode and cathode must exist so the electrons can move between them. |
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How much more is corrosion accelerated with sea water?
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By a factor of 1000 times or more.
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What kind of corrosion is stainless steal susceptible to?
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Pitting
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How can filiform corrosion be prevented?
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Storing in relative humidity of below 65%.
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What kind of corrosion is high strength steel and aluminum parts susceptible to?
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Stress corrosion.
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What kind of dust forms with corroded steel?
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Red dust
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What metal is considered the best coating for corrosion resistance and solder-ability?
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Gold
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