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40 Cards in this Set
- Front
- Back
how much does corrosion cost the navy each year
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up to 20 billion |
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when does corrosion occur
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metals contact with air, moisture, high temperatures, bacteria, chemicals, and sometimes other metals
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how can a metal be chemically broken down and oxidized
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coming in contact with a corrosive liquid or gas |
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chemically corrosive contaminates
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dirt, salt, acid, gases |
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conditions that must be present for electrochemical corrosion. |
anodic area, cathodic area, electrolyte, metal |
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how electrochemical corrosion is stopped |
eliminating any of the four conditions |
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which has the higher tendency to corrode |
anode
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catastrophic natural corrosion
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salty atmosphere |
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dust from volcanic ash contains |
chlorides and sulfates |
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industrial pollution, manufacturing operations, storage and shipping conditions
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man made |
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chemicals associated with the industrial pollution |
carbon, nitrates, ozone, sulfur dioxide, sulfates |
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man made corrosion that creates chipped and damaged equiptment |
shipment |
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temperatures increase corrosion rates |
TRUE |
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passive film
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barrier that forms an invisible layer of oxide
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cover of corrosion over a large surface area
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uniform |
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gives stainless steel a higher level of resistance |
passive film |
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metal that greatly accelerates corrosion of the other metals and accumulates a blusish green hue |
copper |
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color rust most associated with steel |
red
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metal that leaves a white to gray powdery material with pitting
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Aluminum |
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Metal that leaves white powdery mounds |
Magnesium |
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further one metal is from another the greater the corrosion |
true |
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order metals are arranged on the galvanic table |
order of relative activity in a sea water environment |
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factors that determine the type of corrosion that may form |
metal type, environment, lack of protective coating |
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corrosion that occurs in the absence of water at high temperatures |
oxidation |
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cracking of metals caused by the combined effects of cyclic stress and corrosion |
Fatigue |
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Filiform is recognized by |
wormlike trace of corrosion, products beneath paint film |
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seen on the surface of pitting corrosion |
tiny pitts or holes |
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first step once corrosion is detected |
begin corrective action |
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procedure for exposed metals that cannot be painted or coated |
wiped down with oil |
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what must paint surfaces be inspected for? |
bumps, blisters, flakes, chips and lumps |
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type of cleaner used for cleaning surfaces in a corrosive environment |
mildest possible non corrosive environment |
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how are the costs resulting from corrosion minimized |
early detection, identification, and treatment
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4 basic standard stages of corrosion prevention and control
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cleaning, inspection, control and protection |
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least active metal, low corrosion potential, accelerates the corrosion of any metal |
carbon fiber |
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tarnishes in the presence of sulfur |
Silver |
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metals used as protective platings |
nickel and chromium
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with titanium, what is necessary to prevent galvanic corrosion of the other metal.
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electrical insulaiton |
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corrosion that looks like sideways lightning
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intergranulated |
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first indication of corrosion in aluminum and magnesium |
pitting |
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corrosion recognized by an intense localized corrosion that occurs within crevices and other shielded areas.
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crevice and concentration cell
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