Questions and Answers 100% Pass
Define Corrosion - ✔✔The deterioration of a substance, usually a metal from a reaction
with its environment
What is passivation? - ✔✔A layer of oxides formed on the surface of a metal that
provides corrosion protection.
What is an example of passivation? - ✔✔Stainless Steel
What are the elements of a corrosion cell? - ✔✔Anode, Cathode, Metallic Pathway,
Electrolyte
Describe what happens at the anode. - ✔✔The metal dissolves into the electrolyte
What is the function of the electrolyte? - ✔✔Allows the passage of ions to connect the
corrosion cell
What is the function of the metallic pathway? - ✔✔Allows the flow of electrons to
connect the corrosion cell
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, What is the galvanic series? - ✔✔A listing of metals in order of reactivity (more or less
noble) in seawater at 25 C
The general rules of galvanic corrosion are: - ✔✔The less noble (or more reactive) metal
when connected to a more noble (or less reactive metal) will corrode preferentially
Name the five most important factors that affect the rate of corrosion. - ✔✔Humidity,
oxygen, chemical salts, pollutants, temperature
General corrosion is: - ✔✔Results in a relatively uniform loss of material over the entire
surface, Results in a general thinning of the affected surface, Relatively easy to inspect,
Does not casue catastrophic failures
Localized corrosion is: - ✔✔Typically pitting and crevice corrosion. It is typically of the
most concern as damage is concentrated and loss of integrity or structural failure can
result.
List some of the common tools/methods used for corrosion control. - ✔✔Design,
Inhibitors, Material Selection, Cathodic Protection, Protective Coatings, Splash Zone
Systems, Alteration of the Environment
How does NACE define the inspector's role? - ✔✔The inspector's role is that of a quality
control technician responsible for observing and reporting conformance or deviation
from the project specification.
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