Corrosion of Metals (Leaving Cert Engineering): Flashcards
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Practise the cards
15 cards from this deck
Corrosion definition
Corrosion definition
Degradation of metals via chemical or electrical reactions
Uniform corrosion
Uniform corrosion
Affects entire exterior surface evenly
Crevice corrosion
Crevice corrosion
Occurs in small, confined spaces with ion differences
Stress corrosion cracking
Stress corrosion cracking
Mechanical stress + corrosive environment exposure
Galvanic corrosion
Galvanic corrosion
Two different metals in contact in wet/salty environment
Main substances causing corrosion
Main substances causing corrosion
Oxygen, water, acids, other chemicals
Rusting of iron caused by
Rusting of iron caused by
Moisture and oxygen
Tarnishing of silver caused by
Tarnishing of silver caused by
Sulfur compounds in air
Green patina on copper caused by
Green patina on copper caused by
Oxygen, moisture, and pollutants like sulfur dioxide
Rust-resistant metals examples
Rust-resistant metals examples
Stainless steel and aluminium
Protective layer examples
Protective layer examples
Grease, oil, paint, or carbon fibre finishes
Sacrificial anodes purpose
Sacrificial anodes purpose
Corrode instead of protected metal in cathodic protection
Temperature effect on corrosion
Temperature effect on corrosion
Higher temperature increases corrosion rates
Electrolytes effect on corrosion
Electrolytes effect on corrosion
Increase corrosion rates by facilitating ion movement
Metal reactivity and corrosion
Metal reactivity and corrosion
More reactive metals corrode faster