10 Questions
What is the effect of adding a small amount of copper sulphate to dilute sulphuric acid on the corrosion of zinc metal?
It reduces the hydrogen overvoltage.
What is the relationship between the specific volume ratio of a metal oxide and the oxidation corrosion rate?
The higher the specific volume ratio, the lower the oxidation corrosion rate.
What is the effect of a small anodic area on the corrosion rate?
It increases the corrosion rate.
What type of corrosion occurs when two dissimilar metals or alloys are in contact?
Galvanic corrosion.
What is the factor that affects the rate of corrosion in the presence of a surface film?
The specific volume ratio of the metal oxide.
Why is the corrosion of zinc metal increased when copper sulphate is added to dilute sulphuric acid?
Because copper sulphate reduces the hydrogen overvoltage.
What is the effect of a large cathodic area on the corrosion of a small anodic area?
It increases the corrosion rate of the anodic area.
What type of corrosion occurs when there is a difference in aeration between two areas of the same metal?
Differential aeration corrosion.
What is the effect of a higher current density on the corrosion rate?
It increases the corrosion rate.
Why is the corrosion of Tungsten the least among Ni, Cr, and W?
Because of its high specific volume ratio.
Understand how corrosion occurs in metal parts with limited oxygen supply, including examples of water line corrosion and metal parts buried in soil. Learn how the anodic and cathodic regions are formed and how corrosion takes place.
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