Question

The cast irons are highly corrosive resistant material due to presence of high silicon content in it.

(a) True

(b) False

I have been asked this question during an interview.

My enquiry is from Cast Irons topic in section Foundry Introduction & Materials of Casting-Forming-Welding II

Answer 1

Right option is (a) True

Explanation: The composition of cast iron generally varies depending on the grade of pig iron used in its manufacturing process. High silicon content in cast iron makes it resistance to oxidation and corrosion by creating a tight adhering oxide layer to minimize other further attacks. Iron castings are used in applications where this type of resistance gives relatively good service.