Question

Which of the following is the most environmental factor of filiform corrosion?

(a) Relative humidity of the atmosphere

(b) Temperature

(c) pH of the environment

(d) Temperature and pH of the environment

I had been asked this question during an online exam.

Enquiry is from Eight Forms in portion Eight Forms of Corrosion of Corrosion Engineering

Answer 1

Correct option is (a) Relative humidity of the atmosphere

The explanation is: Relative humidity of the surroundings is the most environmental factor of filiform corrosion. It occurs primarily between 65% to 90% relative humidity. If the relative humidity is less than 65%, the metal is unaffected.