Corrosion in Poor-Oxygenated Parts
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Questions and Answers

What is the effect of adding a small amount of copper sulphate to dilute sulphuric acid on the corrosion of zinc metal?

  • It increases the hydrogen overvoltage.
  • It has no effect on the hydrogen overvoltage.
  • It reduces the hydrogen overvoltage. (correct)
  • It increases the rate of oxidation.

    • What is the relationship between the specific volume ratio of a metal oxide and the oxidation corrosion rate?

  • The ratio is only applicable to Nickel and Chromium.
  • The higher the specific volume ratio, the lower the oxidation corrosion rate. (correct)
  • The specific volume ratio has no effect on the oxidation corrosion rate.
  • The higher the specific volume ratio, the higher the oxidation corrosion rate.

    • What is the effect of a small anodic area on the corrosion rate?

  • It only affects the cathodic area.
  • It decreases the corrosion rate.
  • It has no effect on the corrosion rate.
  • It increases the corrosion rate. (correct)

    • What type of corrosion occurs when two dissimilar metals or alloys are in contact?

    <p>Galvanic corrosion.</p> Signup and view all the answers

    What is the factor that affects the rate of corrosion in the presence of a surface film?

    <p>The specific volume ratio of the metal oxide.</p> Signup and view all the answers

    Why is the corrosion of zinc metal increased when copper sulphate is added to dilute sulphuric acid?

    <p>Because copper sulphate reduces the hydrogen overvoltage.</p> Signup and view all the answers

    What is the effect of a large cathodic area on the corrosion of a small anodic area?

    <p>It increases the corrosion rate of the anodic area.</p> Signup and view all the answers

    What type of corrosion occurs when there is a difference in aeration between two areas of the same metal?

    <p>Differential aeration corrosion.</p> Signup and view all the answers

    What is the effect of a higher current density on the corrosion rate?

    <p>It increases the corrosion rate.</p> Signup and view all the answers

    Why is the corrosion of Tungsten the least among Ni, Cr, and W?

    <p>Because of its high specific volume ratio.</p> Signup and view all the answers

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