• General thinning (wastage)
1. Material corroded fairly uniformly over wide area, and where the flaky and porous corrosion products no barrier to further corrosion
• Passive film formation (beneficial)
1. Corrosion products form durable & impervious barrier which slows down / halts more corrosion
• Oxidation (mainly high temperature ‘dry’)
1. Consequence: scale formation which causes eg blockages in pipe work
• Pitting
1. Material selectively attacked to form spherical pits
• Cracking
1. Selective attack leads to formation of deep, sharp-fronted cracks
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