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Selective Leaching in Alloys Quiz

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Questions and Answers

What is the necessary condition for selective leaching to occur in an alloy?

The two elements must have significant difference in their electrode potentials (correct)

The corrosion potential must be higher than the equilibrium potential of the nobler element

Only one element should be present in significant amounts

The two elements must have similar electrode potentials

Which term is used to describe the process of selective leaching in brass alloys?

Denickelification

Dezincification (correct)

Dealuminofication

Graphitic corrosion

How can selective leaching be prevented in alloys?

Adding more of the reactive element to the alloy

Increasing the corrosion potential of the nobler element

Using alloys with similar electrode potentials

Avoiding exposure to the specific corrosive medium triggering the leaching (correct)

What is the main cause of sensitization in austenitic stainless steels?

Depletion of chromium at grain boundaries Signup and view all the answers

Which method is NOT recommended for the prevention of intergranular corrosion of sensitized stainless steels?

Adding titanium as a stabilizing agent Signup and view all the answers

Exfoliation corrosion in aluminum alloys is most likely to occur due to?

Preferential precipitation at grain boundaries Signup and view all the answers

What is a common industrial alias for pitting corrosion?

Oxygen attack Signup and view all the answers

Which of the following is a characteristic feature of pitting corrosion?

Localized attack with microscopic pits Signup and view all the answers

What process leads to the autocatalytic nature of pitting corrosion?

Chloride ions combine with water to regenerate ions Signup and view all the answers

Which of the following is a common method to prevent selective leaching in metals?

Reducing the ratio of zinc in the alloy Signup and view all the answers