Environmental Degradation of Materials — Winter 2023

Ametal tank has flat bottom and experiences corrosion at corner. Suggest remedy to avoid corrosion without changing material.

If pure copper and pure zinc metal are in contact in presence of corrosive media. Predict which metal will corrode? Why?

Pipe bends in pipeline fails preferentially. Suggest cause of failure? Explain mechanism and prevention for it.

Briefly explain faraday’s law of electrolysis.

Explain fretting corrosion mechanism.

Write brief note on hydrogen damage.

Write detailed note on wear and its measurement methods.

Explain uniform corrosion and its prevention.

Discuss mechanism of cavitation damage with neat sketch.

What lead to pit formation by pitting corrosion in material? Write detailed note on pitting corrosion mechanism.

What is inhibitor? List different types of inhibitor.

How to avoid IGC of austenitic stainless steel.

Write in brief about anodizing and galvanizing coating for corrosion control.

Why zinc coating of iron protect from corrosion even if coating break?

If instead of zinc coating, tin coating is used, iron undergoes severe corrosion. Explain why.

If stabilized austenitic stainless steel is exposed to more than 1200 0C, it become prone to corrosion. Explain why and how it can be prevented.

What is sensitization temperature range for austenitic stainless steel? Explain phenomena of sensitization.

Suggest ways to avoid galvanic corrosion.

Write note on different methods for corrosion rate measurement.

What is stress corrosion cracking? Give example where SCC results.

Briefly explain pourbaix diagram for metal water system.

Write detailed note on polarization.

Justify corrosion is reverse of extractive metallurgy.

Explain method of impressed current cathodic protection.

Brass preferentially loose zinc in presence of corrosive media. Predict corrosion and explain its mechanism.