NACE CP1 STUDY EXAM QUESTIONS & ANSWERS.
corrosion - CORRECT ANSWER The deterioration of a substance, usually a metal from a reaction with its environment
Passivation - CORRECT ANSWER A layer of oxides formed on the surface of a metal that provides corrosion protection.
the elements of a c...
NACE CP1 STUDY EXAM QUESTIONS &
ANSWERS.
corrosion - CORRECT ANSWER The deterioration of a substance, usually a metal from a reaction with its
environment
Passivation - CORRECT ANSWER A layer of oxides formed on the surface of a metal that provides
corrosion protection.
the elements of a corrosion cell - CORRECT ANSWER Anode, cathode, metallic pathway, electrolyte
what happens at the anode - CORRECT ANSWER The metal dissolves into the electrolyte
the function of the metallic pathway - CORRECT ANSWER Allows the flow of electrons to connect the
corrosion cell
galvanic series - CORRECT ANSWER A listing in order of reactivity ( more or less noble) in seawater 25c
The general rules of galvanic corrosion - CORRECT ANSWER The less noble (more reactive) metal when
connected to a more noble (or less reactive metal) will corrode preferentially.
the five most important factors that affect the rate of corrosion. - CORRECT ANSWER Humidity, oxygen,
chemical salts, pollutants, temperature
General corrosion - CORRECT ANSWER Results in a relatively uniform loss of material over the entire
surface. Results in a general thinning of the affected surface. Realively easy to inspect. Does not cause
catastrophic failures.
Localized corrosion - CORRECT ANSWER Typically pitting and crevice corrosion. It is typically of the most
concern as damage is concentrated and loss of integrity or structure failure can result.
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