Metal corrosion cannot be successfully halted via its__________________?
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Answer: A. Tempering
Explanation
Tempering modifies internal crystalline stresses and hardness through controlled thermal heating cycles. The process alters mechanical properties but leaves the chemical corrosion resistance unchanged. Corrosion protection requires active surface barriers or specific alloying elements within the metal. Tempering is performed on quenched steels to reduce brittleness and increase toughness. Alloying involves adding elements like chromium to form protective passive oxide surface films. Surface treatments like chromising and aluminising impart durable corrosion-resistant outer layers.
Engineering components undergo tempering to withstand high mechanical shock without fracturing unexpectedly. Protecting structural metals from environmental degradation prevents catastrophic infrastructure failure over time. Manufacturers select specific protective coatings based on the anticipated operating environment. Chromising diffuses chromium into the metal surface to create a corrosion-resistant barrier layer. Aluminising forms an aluminum-rich surface alloy that prevents high-temperature oxidation and corrosion. Alloying incorporates corrosion-resistant elements throughout the entire bulk matrix of the material.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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