Engineering · Unit 3 · Civil structures in society · Civil structures in society
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A steel pipeline carrying pressurised natural gas is buried underground in soil with high chloride content and variable moisture levels. Engineers discover longitudinal cracks along welded joints despite no visible surface rust. Identify the most likely type of corrosion affecting the pipeline. Justify your response using two characteristics of the corrosion mechanism or environment.
Identify the most suitable corrosion protection method for the steel pylons of a coastal bridge structure that are partially submerged in seawater and subject to cyclic loading from traffic vibrations. Use two features of the corrosive environment to justify your response.
A coastal bridge is constructed using steel beams in direct contact with seawater spray and high humidity. After several years, visible rust appears on unprotected sections, while galvanised sections remain largely intact. Identify the type of corrosion occurring on the unprotected steel beams. Justify your response using two features of the corrosive environment.
An underground steel water pipeline is installed in clay soil with high sulfate content and fluctuating groundwater levels. Explain why two different types of corrosion are likely to occur in this environment, and recommend one corrosion protection method that addresses both types.