Corrosion - Final Study Set Questions with Correct Answers
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Course
Challenger 350
Institution
Challenger 350
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 red...
Corrosion - Final Study Set Questions with Correct
Answers
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
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
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
DESCRIBE RH (RELATIVE HUMIDITY) Correct Answer-RH is
defined as the ratio of the quantity of water vapor present in the
atmosphere to the saturation quantity at a given temperature, and it is
expressed as percent
WHAT IS THE MAIN DRAWBACK OF USING CORROSION
COUPONS FOR ATMOSPHERIC CORROSION CONTROL? Correct
Answer-They require long exposure times
WHAT IS THE MOST COMMON/ WIDESPREAD METHOD TO
CONTROL ATMOSPHERIC CORROSION OF METALS? Correct
Answer-Using protective coatings
NAME AN ALTERNATIVE DE-ICING AGENT TO ROCK SALT
(NACL) AND EXPLAIN WHY IT IS NOT SUITABLE FOR WIDE
USAGE? Correct Answer-Calcium Magnesium Acetate or CMA is an
alternative de-icer and it not corrosive. It's very expensive and because
of that its usage has been limited to cases where corrosion due to usage
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