Question

Which of the following can be used to inhibit stress corrosion cracking in ammoniacal solutions?

(a) Addition of 0.2% water

(b) Addition of 0.025% hydrazine in refrigeration

(c) Addition of oxidizing agents

(d) Either addition of 0.2% water or addition of 0.025% hydrazine in refrigeration

I got this question during an internship interview.

Question is taken from Environments topic in division Other Environments of Corrosion Engineering

Answer 1

The correct choice is (d) Either addition of 0.2% water or addition of 0.025% hydrazine in refrigeration

Explanation: Oxygen and oxidizing agents are the primary cause of stress corrosion cracking in ammoniacal solutions. It can be inhibited by the addition of 0.25% of water or the addition of 0.025% hydrazine in refrigeration.