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LO block 4 test With Correct Actual Questions And Correctly Well Defined Answers.

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corrosion - correct answer deterioration of the metal by chemical or electrochemical reaction to its environment atom - correct answer smallest unit of an element ions - correct answer ...

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  • October 4, 2024
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RealGrades
LO block 4 test

corrosion - correct answer deterioration of the metal by chemical or
electrochemical reaction to its environment



atom - correct answer smallest unit of an element



ions - correct answer positively or negatively charged atoms. can only move
through liquid



electron - correct answer negatively charged particle



neutron - correct answer neutral particle



Proton - correct answer positively charged particle



Corrosion Theory - correct answer anode, cathode, metal path, electrolyte



Anode - correct answer high tendency to corrode and is active, loses electrons



Cathode - correct answer less tendency to corrode and is passive. gains electrons



metal path - correct answer the conductor that allows electrons to travel from the
anode to the cathode



Electrolyte - correct answer liquid containing ions. most important factor because is
can be controlled.



where does corrosion start? - correct answer the surface

, once corrosions has started to form how can you stop it - correct answer remove
every trace



corrosion factors - correct answer temperature, time, electrolyte strength, oxygen,
biological organisms, mechanical stress, heat treatment/ grain direction



electrolyte strength - correct answer strong or weak. most critcal factor affecting
the rate of corrosion



Potential hydrogen (ph) - correct answer how strength of electrolyte is measured.
further away from 7 the stronger the electrolyte



biological organisms - correct answer slime, mold, fungi. they secrete corrosive
waste



stress cracking - correct answer dangerous because the part could fail under a
normal load



Uniform surface corrosion - correct answer first seen as dulling of the surface. if
unnoticed the surface can become rough and possibly frosted in appearance.



pitting - correct answer progression of uniform surface. aluminum=white
magnesium= gray. when cleaned tiny pits are revealed



galvanic - correct answer difference in metal composition. buildup of corrosion at
the joint between metals. EXAMPLE - around rivets and fasteners



intergranular - correct answer difference in metal composition between the grain
boundary and center part of grain. hard to detect because it is beneath the surface



exfoliation - correct answer advanced stage of intergranular corrosion. grains are
separated from each other

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