Wrought iron serves as an appropriate construction material for managing _____________ solutions?
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Answer: C. Alkalis & alkaline
Explanation
Wrought iron features a pure iron matrix combined with silicate slag fibers that resist alkaline attack. Caustic solutions do not rapidly corrode the iron matrix, making wrought iron suitable for alkaline service. Industrial alkaline processing equipment historically utilized wrought iron to ensure long operating lifespans. Alkaline solutions contain high concentrations of hydroxide ions that dissolve many common metals and oxides. Wrought iron contains fibrous silicate inclusions that interrupt continuous corrosion pathways through the metal. The chemical passivity of iron in alkaline environments prevents the rapid thinning seen in acidic services.
Historical chemical plants handling sodium hydroxide solutions frequently specified wrought iron for tanks and piping. Soap manufacturing processes involving boiling caustic solutions relied upon wrought iron process equipment. Water treatment facilities utilizing alkaline chemical dosing sometimes employed iron piping systems for longevity. Dilute acidic solutions readily attack and dissolve wrought iron due to hydrogen evolution corrosion mechanisms. Concentrated acidic environments cause severe chemical degradation and rapid failure of wrought iron equipment. None of these is incorrect because wrought iron serves as an appropriate material for alkaline solutions.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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