Corrosion: Conditions and Prevention

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What is corrosion?
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Corrosion is the process of deterioration of metals due to chemical reactions with their environment.
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What are common conditions that lead to corrosion?
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Common conditions include exposure to moisture, oxygen, acids, and salts.
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Why is moisture essential for corrosion?
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Moisture provides the necessary medium for chemical reactions that lead to corrosion.
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How does salt accelerate corrosion?
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Salt increases the conductivity of water, enhancing the electrochemical reactions that cause corrosion.
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What is rust, and which metal does it commonly affect?
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Rust is iron oxide, a common result of the corrosion of iron and steel.
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Name two conditions that can slow down corrosion.
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Protective coatings and controlled environments without oxygen and moisture.
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What is galvanization?
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Galvanization is the process of applying a protective zinc coating to steel or iron to prevent rusting.
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What role does pH play in corrosion?
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Extreme pH levels (highly acidic or basic) can increase the rate of corrosion.
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What are sacrificial anodes and how do they work?
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Sacrificial anodes are more reactive metals placed with another metal; they corrode first, protecting the less reactive metal.
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How can coatings prevent corrosion?
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Coatings act as a barrier to environmentally corrosive agents.
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Why is the control of impurities important in preventing corrosion?
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Impurities can act as catalysts, increasing the rate of corrosion.
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Describe an example of a corrosion-preventive coating.
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Paint is a common corrosion-preventive coating, providing a physical barrier against moisture and oxygen.
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What is cathodic protection?
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Cathodic protection is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell.
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How does temperature affect corrosion rates?
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Higher temperatures typically increase corrosion rates by accelerating chemical reactions.
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Why is it important to prevent corrosion?
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Preventing corrosion is crucial to maintaining structural integrity, safety, and value of metal products.
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