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2021 Scheme Engineering Chemistry 21CHE12/22 Module 2 Notes (Download👇)
21CHE12/22 – Module 2
Corrosion and Metal finishing
MODULE 2
Corrosion and it’s control:
Introduction, Electrochemical theory of corrosion, Factors affecting the rate of corrosion: ratio of anodic
to cathodic areas, nature of corrosion product, nature of medium – pH, conductivity and temperature.
Types of corrosion – Differential metal and differential aeration (pitting and water line). Corrosion
control: Anodizing – Anodizing of aluminum, Cathodic protection – sacrificial anode and impressed
current methods, Metal coatings – Galvanization. Corrosion Penetration Rate (CPR), numerical
problems on CPR.
Metal finishing: Introduction, technological importance. Electroplating: Introduction, Electroplating
of chromium (hard and decorative). Electroless plating: Introduction, distinction between
electroplating and electroless plating processes. Electroless plating of copper.
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