Question

The intergranular attack is evident in the resin shell casting but not on the ceramic mold casting.

(a) True

(b) False

I had been asked this question in an interview.

The origin of the question is Eight Forms in portion Eight Forms of Corrosion of Corrosion Engineering

Answer 1

The correct answer is:

(a) True

Explanation:

Intergranular corrosion refers to corrosion that occurs along the grain boundaries of a material, which can happen when certain factors like impurities, elemental depletion, or phase segregation occur at those boundaries. In resin shell casting, impurities or segregation can create regions that are more prone to corrosion, leading to intergranular attack.

On the other hand, ceramic mold casting involves the use of ceramic materials, which are more stable and less likely to experience the same type of intergranular attack as metals, since ceramics don't have grain boundaries in the same sense as metals do.

Therefore, it is true that intergranular attack is more commonly observed in resin shell casting than in ceramic mold casting, making the statement True.