Corrosion of Metals (Leaving Cert Engineering): Flashcards
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Practise the cards
14 cards from this deck
What is corrosion?
What is corrosion?
Degradation of metals by chemical/electrical reactions
Results of corrosion
Results of corrosion
Material loss & reduced durability
Uniform corrosion
Uniform corrosion
Corrosion affecting entire surface evenly
Crevice corrosion
Crevice corrosion
Corrosion in small confined spaces
Stress corrosion cracking
Stress corrosion cracking
Corrosion from mechanical stress + corrosive environment
Galvanic corrosion
Galvanic corrosion
Two different metals in contact in wet/salty environment
Main causes of corrosion
Main causes of corrosion
Oxygen, water, acids, chemicals
Rusting of iron causes
Rusting of iron causes
Moisture & oxygen
Tarnishing of silver causes
Tarnishing of silver causes
Sulfur compounds in air
Green patina on copper causes
Green patina on copper causes
Oxygen, moisture, & pollutants
Protective coating examples
Protective coating examples
Grease, oil, paint, carbon fibre finishes
Sacrificial anodes purpose
Sacrificial anodes purpose
Used in cathodic protection to prevent corrosion
Effect of temperature on corrosion
Effect of temperature on corrosion
Higher temp increases corrosion rate
Effect of electrolytes on corrosion
Effect of electrolytes on corrosion
Increases corrosion rates by facilitating ion movement