INSPECTOR THEORY EXAM 2025
QUESTIONS AND ANSWERS
What are Volatile Organic Compounds (VOCs)? - ANS Chemicals that easily evaporate at
room temperature.
What are solvents? - ANS Substances that dissolve other substances to form a solution.
Why can solvents in coatings be harmful? - ANS Because they can release VOCs into the air.
What are some examples of solvents used in coatings? - ANS Acetone, toluene, xylene, and
ethyl acetate.
What are three commonly used galvanic anodes for carbon steel? - ANS Zinc, Aluminum, and
Magnesium
What is the effect of temperature on corrosion rate? - ANS Decrease in temperature
decreases corrosion rate.
What is an electrolyte? - ANS A medium that carries ionic current.
What is sacrificial coating? - ANS A type of coating that becomes the anode of an
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electrochemical cell.
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, What is the role of binders in coating? - ANS Binders form a stable film that retains its
properties.
What is a barrier coating? - ANS A coating that interrupts the electrolyte of an
electrochemical cell.
What are two environments most susceptible to corrosion? - ANS Marine Environment,
Chemical with High Humidity Environment
What is the direction of electron flow in an oxidation reaction? - ANS From the anode to the
cathode through the metallic path.
What is the role of binders? - ANS Binders bonds pigments together and adhere to surface.
What are solvents? - ANS Solvents are liquids that dissolve the solid resins.
What is the purpose of pigments? - ANS Pigments hide the substrates, provide decorative
color, and enhance desired properties.
What are additives? - ANS Additives are special purpose ingredients used to enhance the
performance.
What are vehicles? - ANS Vehicles are the liquid portions of the coating.
What is corrosion? - ANS Deterioration of metal or alloy due to electrochemical reaction.
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What is passivation? - ANS Layer of oxides on metal surface for corrosion protection.
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, Give an example of a metal that undergoes passivation. - ANS Stainless steel
What is an anode? - ANS The electrode where oxidation occurs.
What is a cathode? - ANS The electrode where reduction occurs.
What is a metallic pathway? - ANS The conductive path for electrons to flow.
What are electrolytes? - ANS Substances that conduct electricity when dissolved in water.
What is the function of an electrolyte in corrosion? - ANS Allows passage of ions in corrosion
cell.
What is the function of a metallic pathway in corrosion? - ANS Allows flow of electrons in
corrosion cell.
What is the galvanic series? - ANS Listing of metals in order of reactivity.
What is the general rule of the galvanic series? - ANS Less noble metal connected to a more
noble metal will corrode preferentially.
What is localized corrosion? - ANS Corrosion that occurs in specific areas.
What are the types of localized corrosion? - ANS Pitting and crevice corrosion.
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, Why is localized corrosion concerning? - ANS Damage is concentrated and can lead to
structural failure.
What is general corrosion? - ANS Uniform loss of material over entire surface.
How does general corrosion affect the surface? - ANS Results in general thinning of affected
surface.
Is general corrosion easy to inspect? - ANS Yes, it is relatively easy to inspect.
Does general corrosion cause catastrophic failure? - ANS No, it does not cause catastrophic
failure.
What is inorganic convertible thermosetting? - ANS Coating that undergoes irreversible
chemical changes upon curing.
What is inorganic non-convertible thermoplastic? - ANS Coating that softens upon heating
and hardens upon cooling.
What are the primary components of a liquid applied coating? - ANS Pigments and Vehicle
(Resin or Binder and Solvent)
What is a sacrificial coating system? - ANS A coating system where a more active metal is
applied over a less active metal to act as an anode and protect the underlying metal.
Why is inorganic zinc commonly used as a sacrificial coating over mild steel? - ANS Zinc is
more active than steel, so it becomes the anode and protects the steel from corrosion.
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