Corrosion - Final Exam Actual Questions
and Answers 2026
What is the driving force for corrosion of metals? Provide a brief
description. -
correct answer ✅The metals want to constantly be at their lowest
energy state and will do whatever they can to make that happen.
When it does, corrosion is created.
Which of the following defines the oxidation and reduction
reactions happening in corrosion reactions? -
correct answer ✅Reduction happens when metals receive
electrons and oxidation happens when metals lose electrons.
According to following galvanic series for metals in sea water, if Zinc
(Zn) and Carbon Steel (Fe) are immersed in sea water, which metal
will be the cathode and which metal will be the anode in the
corrosion reaction? (For the table, the metals on the right are more
reactive compared to the metals on the left)
Where does the oxidation reaction happen ?
Where does the reduction reaction happen? -
correct answer ✅Zinc will be the Anode and Carbon Steel will be
the Cathode
Oxidation happens in Anode and Reduction happens in Cathode
,Corrosion - Final Exam Actual Questions
and Answers 2026
Explain how Daniell Cell works. -
correct answer ✅Daniell Cell consists of two different metals: Zinc
(Zn) which works as an anode and Copper (Cu) as a cathode. Each
of these electrodes remains dipped into chemical solutions made
out of their own ions.
A flow of electric current is generated through an external circuit.
The zinc rod loses mass while copper gains it. The concentration of
Zinc Sulphate increases while the concentration of Copper Sulphate
decreases. In both the compartments, the solutions remain
electrically neutral. While the separation resists polarization, the
design allows a flow of ions between the metals through the
electrolyte.
What is the cathodic reaction when Zinc is immersed in HCl
(hydrochloric Acid)? -
correct answer ✅Zinc reacts rapidly with hydrochloric acid to form
zinc chloride and hydrogen gas. The zinc metal displaces the
hydrogen to form hydrogen gas and zinc chloride.
What is the main cause of corrosion in reinforced concrete
structures? -
correct answer ✅Corrosion of steel reinforcing bars
, Corrosion - Final Exam Actual Questions
and Answers 2026
NAME TWO MAIN POLLUTING GASES IN INDUSTRIAL
ENVIRONMENTS -
correct answer ✅Sulfur Dioxide (SO2) and Nitrogen Oxide (NO2)
WHAT ARE THE MOST AND LEAST CORROSIVE ENVIRONMENTS?
(HINT: THE CATEGORY INCLUDES 5 ENVIRONMENTS: RURAL,
MARINE, INDUSTRIAL, INDOOR, AND SUBURBAN) -
correct answer ✅The Most Corrosive: Industrial
The Least Corrosive: Indoor
IN A MARINE ENVIRONMENT, HOW DOES THE CORROSION RATE OF
CARBON STEEL CHANGE WITH DISTANCE FROM THE SHORE AND
WHY? -
correct answer ✅Corrosion rate decreases. The quantity of salt
contamination in marine environment decreases as the distance
from the shore increases.
THE CORROSION ACTIVITY MAY _____ FOR EACH 10° INCREASE IN
TEMPERATURE IN ATMOSPHERIC CORROSION CASES. -
correct answer ✅Double
and Answers 2026
What is the driving force for corrosion of metals? Provide a brief
description. -
correct answer ✅The metals want to constantly be at their lowest
energy state and will do whatever they can to make that happen.
When it does, corrosion is created.
Which of the following defines the oxidation and reduction
reactions happening in corrosion reactions? -
correct answer ✅Reduction happens when metals receive
electrons and oxidation happens when metals lose electrons.
According to following galvanic series for metals in sea water, if Zinc
(Zn) and Carbon Steel (Fe) are immersed in sea water, which metal
will be the cathode and which metal will be the anode in the
corrosion reaction? (For the table, the metals on the right are more
reactive compared to the metals on the left)
Where does the oxidation reaction happen ?
Where does the reduction reaction happen? -
correct answer ✅Zinc will be the Anode and Carbon Steel will be
the Cathode
Oxidation happens in Anode and Reduction happens in Cathode
,Corrosion - Final Exam Actual Questions
and Answers 2026
Explain how Daniell Cell works. -
correct answer ✅Daniell Cell consists of two different metals: Zinc
(Zn) which works as an anode and Copper (Cu) as a cathode. Each
of these electrodes remains dipped into chemical solutions made
out of their own ions.
A flow of electric current is generated through an external circuit.
The zinc rod loses mass while copper gains it. The concentration of
Zinc Sulphate increases while the concentration of Copper Sulphate
decreases. In both the compartments, the solutions remain
electrically neutral. While the separation resists polarization, the
design allows a flow of ions between the metals through the
electrolyte.
What is the cathodic reaction when Zinc is immersed in HCl
(hydrochloric Acid)? -
correct answer ✅Zinc reacts rapidly with hydrochloric acid to form
zinc chloride and hydrogen gas. The zinc metal displaces the
hydrogen to form hydrogen gas and zinc chloride.
What is the main cause of corrosion in reinforced concrete
structures? -
correct answer ✅Corrosion of steel reinforcing bars
, Corrosion - Final Exam Actual Questions
and Answers 2026
NAME TWO MAIN POLLUTING GASES IN INDUSTRIAL
ENVIRONMENTS -
correct answer ✅Sulfur Dioxide (SO2) and Nitrogen Oxide (NO2)
WHAT ARE THE MOST AND LEAST CORROSIVE ENVIRONMENTS?
(HINT: THE CATEGORY INCLUDES 5 ENVIRONMENTS: RURAL,
MARINE, INDUSTRIAL, INDOOR, AND SUBURBAN) -
correct answer ✅The Most Corrosive: Industrial
The Least Corrosive: Indoor
IN A MARINE ENVIRONMENT, HOW DOES THE CORROSION RATE OF
CARBON STEEL CHANGE WITH DISTANCE FROM THE SHORE AND
WHY? -
correct answer ✅Corrosion rate decreases. The quantity of salt
contamination in marine environment decreases as the distance
from the shore increases.
THE CORROSION ACTIVITY MAY _____ FOR EACH 10° INCREASE IN
TEMPERATURE IN ATMOSPHERIC CORROSION CASES. -
correct answer ✅Double
