Theory Questions With Correct Answers
2025-2026
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
What is an anode? - CORRECT ANSWER -The electrode where oxidation occurs.
What is a cathode? - CORRECT ANSWER -The electrode where reduction occurs.
What is a metallic pathway? - CORRECT ANSWER -The conductive path for electrons to flow.
What are electrolytes? - CORRECT ANSWER -
Substances that conduct electricity when dissolved in water.
What is the function of an electrolyte in corrosion? - CORRECT ANSWER -
Allows passage of ions in corrosion cell.
What is the function of a metallic pathway in corrosion? - CORRECT ANSWER -
Allows flow of electrons in corrosion cell.
What is the galvanic series? - CORRECT ANSWER -Listing of metals in order of reactivity.
What is the general rule of the galvanic series? - CORRECT ANSWER -
Less noble metal connected to a more noble metal will corrode preferentially.
What is localized corrosion? - CORRECT ANSWER -Corrosion that occurs in specific areas.
What are the types of localized corrosion? - CORRECT ANSWER -
Pitting and crevice corrosion.
, Why s s is s s localized s s corrosion s s concerning? ss- s s CORRECT
s s ANSWER ss- ssDamage s s is s s concentrated s s and s s can s s lead
s s to s s structural s s failure.
What s s is s s general s s corrosion? s s - s s CORRECT
s s ANSWER ss- ssUniform s s loss ssof s s material s s over
s s entire s s surface.
How s s does s s general s s corrosion s s affect s s the s s surface? ss- s s CORRECT
s s ANSWER ss- ssResults s s in s s general s s thinning s s of s s affected
s s surface.
Is s s general s s corrosion s s easy s s to s s inspect? s s - s s CORRECT
s s ANSWER s s - ssYes, s s it s s is ssrelatively sseasy ssto s s inspect.
Does s s general sscorrosion sscause s s catastrophic s s failure? s s - s s CORRECT
s s ANSWER ss- ssNo, s s it s s does ssnot s s cause s s catastrophic s s failure.
What s s is s s inorganic s s convertible s s thermosetting? s s - s s CORRECT
s s ANSWER s s - ssCoating s s that s s undergoes s s irreversible s s chemical
s s changes s s upon s s curing.
What s s is s s inorganic ssnon-convertible s s thermoplastic? s s - s s CORRECT
s s ANSWER ss- ssCoating s s that s s softens ssupon s s heating s s and s s hardens
s s upon s s cooling.
What s s are s s the s s primary s s components s s of s s a s s liquid s s applied s s coating? s s - s s CORRECT
s s ANSWER s s - ssPigments s s and s s Vehicle s s (Resin s s or ssBinder s s and s s Solvent)
What s s is s s a s s sacrificial s s coating s s system? s s - s s CORRECT s s ANSWER s s -
A s s coating s s system s s where s s a s s more s s active s s metal s s is s s applied s s over s s a s s less s s active
s s metal s s to s s act s s as s s an ssanode s s and s s protect s s the s s underlying s s metal.