Corrosion and Prevention — Prelims Questions

Which of the following statements about galvanization is/are correct? 1. It involves coating iron with a layer of tin. 2. The coating provides sacrificial protection to iron. 3. It is primarily used for aluminum alloys. Select the correct answer using the code given below:

Consider the following statements regarding corrosion: 1. Rusting is a specific type of corrosion applicable only to iron. 2. The presence of an electrolyte is essential for electrochemical corrosion. 3. Aluminum readily corrodes due to its high reactivity, forming a porous oxide layer. Which of the statements given above is/are correct?

Which of the following methods is/are used for cathodic protection? 1. Sacrificial anode protection 2. Impressed current cathodic protection 3. Anodization Select the correct answer using the code given below:

Consider the following pairs: 1. Pitting corrosion : Localized attack forming small holes 2. Stress corrosion cracking : Combined action of tensile stress and corrosive environment 3. Intergranular corrosion : Uniform attack over the entire surface Which of the pairs given above is/are correctly matched?

Which of the following environmental factors would generally accelerate the rate of corrosion of iron? 1. High humidity 2. Presence of dissolved salts in water 3. Acidic environment (low pH) 4. High temperature Select the correct answer using the code given below: