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How can caustic embrittlement be avoided?

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How can caustic embrittlement be avoided?

(a) Addition of nickel

(b) Increasing potential

(c) Decreasing carbon

(d) Adding tannins

This question was posed to me during an interview.

The above asked question is from Corrosion and Oxidation Control in portion Imperfection in Metal Crystals, Fracture, Corrosion and Oxidation of Engineering Material & Metallurgy

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Correct choice is (d) Adding tannins

To explain I would say: Caustic embrittlement is caused in boilers due to the stress and high concentration of hydroxyl ions. This can be prevented by the addition of tannins and phosphates.

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