Objective Question & Answer

Steel pipe - Electrolytic corrosion: Steel is a metal and highly susceptible to galvanic or electrochemical corrosion when

in contact with soil and moisture.

Concrete pipe - Sulfide corrosion: Sewage generates hydrogen sulfide H₂S gas, which converts to sulfuric acid and

eats away the concrete crown (known as crown corrosion).

Asbestos cement pipe - Highly resistant to corrosion but can break easily: These pipes handle corrosion well but are

brittle and prone to structural failure under heavy external loads.

Vitrified clay pipe - Virtually corrosion resistant: Clay is an inert ceramic material, making it completely resistant to acids

and chemical corrosion from municipal sewage.