Theory Questions with Correct Answers
2025
What are Volatile Organic Compounds (VOCs)? CORRECT ANSWER -
Chemicals that easily evaporate at room temperature.
What are solvents? CORRECT ANSWER -
Substances that dissolve other substances to form a solution.
Why can solvents in coatings be harmful? CORRECT ANSWER - Because
they can release VOCs into the air.
What are some examples of solvents used in coatings? CORRECT ANSWER - Acetone,
toluene, xylene, and ethyl acetate.
What are three commonly used galvanic anodes for carbon steel? CORRECT ANSWER - Zinc,
Aluminum, and Magnesium
What is the effect of temperature on corrosion rate? CORRECT ANSWER - Decrease
in temperature decreases corrosion rate.
What is an electrolyte? CORRECT ANSWER -A medium that carries ionic current.
What is sacrificial coating? CORRECT ANSWER -
A type of coating that becomes the anode of an electrochemical cell.
What is the role of binders in coating? CORRECT ANSWER -
Binders form a stable film that retains its properties.
,What is a barrier coating? CORRECT ANSWER -
A coating that interrupts the electrolyte of an electrochemical cell.
What are two environments most susceptible to corrosion? CORRECT ANSWER -
Marine Environment, Chemical with High Humidity Environment
What is the direction of electron flow in an oxidation reaction? CORRECT ANSWER - From the
anode to the cathode through the metallic path.
What is the role of binders? CORRECT ANSWER - Binders
bonds pigments together and adhere to surface.
What are solvents? CORRECT ANSWER -Solvents are liquids that dissolve the solid resins.
What is the purpose of pigments? CORRECT ANSWER -
Pigments hide the substrates, provide decorative color, and enhance desired properties.
What are additives? CORRECT ANSWER -
Additives are special purpose ingredients used to enhance the performance.
What are vehicles? CORRECT ANSWER -Vehicles are the liquid portions of the coating.
What is corrosion? CORRECT ANSWER -
Deterioration of metal or alloy due to electrochemical reaction.
What is passivation? CORRECT ANSWER -
Layer of oxides on metal surface for corrosion protection.
, Give an example of a metal that undergoes passivation. CORRECT ANSWER -Stainless steel
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What is an anode? CORRECT ANSWER -The electrode where oxidation occurs.
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What is a cathode? CORRECT ANSWER -The electrode where reduction occurs.
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What is a metallic pathway? CORRECT ANSWER -The conductive path for electrons to flow.
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What are electrolytes? CORRECT ANSWER -
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Substances that conduct electricity when dissolved in water.
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What is the function of an electrolyte in corrosion? CORRECT ANSWER -
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Allows passage of ions in corrosion cell.
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What is the function of a metallic pathway in corrosion? CORRECT ANSWER -
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Allows flow of electrons in corrosion cell.
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What is the galvanic series? CORRECT ANSWER -Listing of metals in order of reactivity.
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What is the general rule of the galvanic series? CORRECT ANSWER -
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Less noble metal connected to a more noble metal will corrode preferentially.
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What is localized corrosion? CORRECT ANSWER -Corrosion that occurs in specific areas.
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What are the types of localized corrosion? CORRECT ANSWER - Pitting
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and crevice corrosion.
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, Why is localized corrosion concerning? CORRECT ANSWER -
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Damage is concentrated and can lead to structural failure.
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What is general corrosion? CORRECT ANSWER - Uniform
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loss of material over entire surface.
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How does general corrosion affect the surface? CORRECT ANSWER -
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Results in general thinning of affected surface.
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Is general corrosion easy to inspect? CORRECT ANSWER - Yes, it
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0is relatively easy to inspect.
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Does general corrosion cause catastrophic failure? CORRECT ANSWER - No, it
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does not cause catastrophic failure.
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What is inorganic convertible thermosetting? CORRECT ANSWER -
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Coating that undergoes irreversible chemical changes upon curing.
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What is inorganic non-convertible thermoplastic? CORRECT ANSWER - Coating
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that softens upon heating and hardens upon cooling.
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What are the primary components of a liquid applied coating? CORRECT ANSWER -
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Pigments and Vehicle (Resin or Binder and Solvent)
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What is a sacrificial coating system? CORRECT ANSWER -
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A coating system where a more active metal is applied over a less active metal to act as an
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anode and protect the underlying metal.
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