Link to glossary of corrosion and materials maintenance terms

Corrosion Categories

Corrosion of common metals according to ISO 9223

When the time of wetness (TOW) falls in category four (T₄)

Chloride	Sulfur dioxide	Steel	Copper & Zinc	Aluminum
S₀ or S₁	P₁	C₃	C₃	C₃
..	P₂	C₄	C_3-4	C_3-4
..	P₃	C₅	C_4-5	C_4-5
S₂	P₁	C₄	C₄	C_3-4
..	P₂	C₄	C₄	C₄
..	P₃	C₅	C₅	C₅
S₃	P₁	C₅	C₅	C₅
..	P₂	C₅	C₅	C₅
..	P₃	C₅	C₅	C₅

Back to ISO 9223