Question

The thickness of the protective film in passivation is about ____________

(a) 1 mm

(b) 0.02 mm

(c) 0.0004 mm

(d) 0.004 mm

The question was asked in an online interview.

I want to ask this question from Galvanic Series in portion Corrosion, Electrolysis, Fuel Cells and Batteries of Engineering Chemistry II

Answer 1

Correct answer is (c) 0.0004 mm

Best explanation: The thickness of the protective film in passivation is about 0.0004 mm. Passivation is the use of a light coat of protective material, such as metal oxide, to create a shell against corrosion.