Metal Corrosion Resistance in Salt Water
This solution addresses the question of identifying which metal resists salt-water corrosion from the provided options.
Key Concept: Salt Water Corrosion
Salt water is highly corrosive to many metals. Corrosion occurs via electrochemical reactions. Metals that resist this environment either form a passive protective layer or act as a sacrificial anode.
Analysis of Options
- Cast iron: Prone to rusting and degradation in saltwater environments.
- Gun metal: A type of bronze, offering moderate corrosion resistance but not optimal for prolonged saltwater exposure compared to specialized alloys or coatings.
- Mild steel: Contains iron and carbon, making it highly susceptible to rust (iron oxide) when exposed to oxygen and saltwater.
- Zinc alloy: Zinc is frequently used for its excellent corrosion resistance, particularly in marine applications. It functions as a sacrificial coating. In a zinc alloy or as a coating (like galvanizing), the zinc corrodes preferentially to the base metal (e.g., steel), thereby protecting it from salt-water corrosion.
Conclusion on Corrosion Resistance
Zinc alloys offer superior resistance to salt-water corrosion due to their sacrificial protection mechanism.
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