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19 Cards in this Set
- Front
- Back
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What is an atom?
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The smallest unit of an element, made
up of a positively charged nucleus surrounded by a system of negatively charged electrons. |
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What is an electron
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A negatively charged subatomic
particle. |
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Definition of corrosion.
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Corrosion is the
electrochemical deterioration of a material or its properties due to its chemical reaction with the surrounding environment. |
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What is an electrolyte?
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A liquid (usually water) solution
containing ions. |
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Theory of corrosion.
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All metals will corrode
to some extent in a natural environment. |
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What four things must be present for corrosion to occur?
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1.Anode 2.Cathode 3.Electrolyte 4.electrical contact
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What is the most common type of corrosion?
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Uniform surface corrosion
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What is galvanic corrosion?
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Occurs when different metals are in contact with each
other and an electrolyte, such as sea water. |
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What does pitting corrosion look like?
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A white or
gray powdery deposit, similar to dust, which blotches the surface. |
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What does exfoliation corrosion look like?
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Swelling or lifting of the metal.
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How is filiform corrosion recognized?
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By is wormlike trace of corrosion products beneath the coating.
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What is the appearance of corrosion on Aluminum alloy?
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White to gray powder
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What metal has corrosion
products that are white powdery snow-like mounds? |
Magnesium alloys
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What type of metals gets a Reddish-brown oxide (rust) corrosion?
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Carbon & Low Alloy Steel
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What does corrosion look like on Titanium Alloy?
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Colored surface oxides develop above 700° F (370° C)
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What type of metal gets green powdery deposits?
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Nickel-base Alloy
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What does corrosion on silver look like?
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Brown to black film
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What does corrosion on gold look like?
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Deposits cause darkening of reflective surfaces
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What kind of alloy is steel?
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Ferrous (iron)
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