Paint systems for metal protection

Decision help for corrosion classes

The corrosion class indicates the extent to which metal surfaces need to be protected against corrosion by impurity. The impact of the corrosion depends on the atmospherical circumstances of the environment where the object is being/will be used. Salt and humidity in the air, polluted atmosphere and impurities have an effect on the formation of corrosion. Atmospherical corrosion is divided up into the corrosion classes C1 to CX according to ISO 9223. For each class, a minimal and maximal corrosion speed has been determined. The corrosion class applies to both indoor and outdoor use of a metal. Aside from the corrosion classes, there are also four immersion classes for construction used underground or underwater.

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	very low corrosivity > indoors dry air and clean indoor climate	PAINT SYSTEMS STEEL C1/C2

	low corrosivity > indoors and outdoors unheated buildings and national dry areas	PAINT SYSTEMS STEEL C1/C2

	average corrosivity > indoors and outdoors Production spaces with high humidity CITIES AND LIGHT INDUSTRIAL ENVIRONMENTS WITH MODERATE POLLUTION	PAINT SYSTEMS STEEL C3

	HIGH CORROSIVITY > indoors and outdoors spaces with a very high humidity like swimming pools light industrial environments with pollution, not near the coast	paint systems steel C4 paint systems galvanized steel C4

	very high corrosivity > outdoors COASTAL AREAS AND AREAS WITH HEAVY INDUSTRY A LOT OF POLLUTION AND HIGH HUMIDITY	paint systems steel C5 paint systems galvanized steel C5

	Extreme corrosiviTY > OUTDOORS Marine AND offshore, VERY AGGRESSIVE ATMOSPHERE Extreme HUMIDITY AND POLLUTION OF THE ENVIRONMENT	PAINT SYSTEMS STEEL CX

	FRESH WATER RivERS, WATER POWER PLANTS	PAINT SYSTEMS IMMERSION

	SALT AND BRACKISH WATER WITHOUT CATHODIC PROTECTION HARBORS AND LOCKS	PAINT SYSTEMS IMMERSION

	underGROUND Dam WALLS, PIPES AND tanks in THE GROUND	PAINT SYSTEMS IMMERSION

	SALT AND BRACKISH WATER WITH CATHODIC PROTECTION HaRBORS AND LOCKS	paint systems immersion

VERY LOW CORROSIVITY > INDOORS
DRY AIR AND CLEAN INDOOR CLIMATE
PAINT SYSTEMS STEEL C1/C2

LOW CORROSIVITY > INDOORS AND OUTDOORS
UNHEATED BUILDINGS AND NATIONAL DRY AREAS
PAINT SYSTEMS STEEL C1/C2

AVERAGE CORROSIVITY > INDOORS AND OUTDOORS
PRODUCTION SPACES WITH HIGH HUMIDITY CITIES AND LIGHT INDUSTRIAL ENVIRONMENTS WITH MODERATE POLLUTION
PAINT SYSTEMS STEEL C3

HIGH CORROSIVITY > INDOORS AND OUTDOORS
SPACES WITH A VERY HIGH HUMIDITY LIKE SWIMMING POOLS
LIGHT INDUSTRIAL ENVIRONMENTS WITH POLLUTION, NOT NEAR THE COAST
PAINT SYSTEMS STEEL C4
PAINT SYSTEMS GALVANIZED STEEL C4

VERY HIGH CORROSIVITY > OUTDOORS
COASTAL AREAS AND AREAS WITH HEAVY INDUSTRY
A LOT OF POLLUTION AND HIGH HUMIDITY
PAINT SYSTEMS STEEL C5
PAINT SYSTEMS GALVANIZED STEEL C5

EXTREME CORROSIVITY > OUTDOORS
MARINE AND OFFSHORE, VERY AGGRESSIVE ATMOSPHERE
EXTREME HUMIDITY AND POLLUTION OF THE ENVIRONMENT
PAINT SYSTEMS STEEL CX

FRESH WATER
RIVERS, WATER POWER PLANTS
PAINT SYSTEMS IMMERSION

SALT AND BRACKISH WATER
WITHOUT CATHODIC PROTECTION
HARBORS AND LOCKS
PAINT SYSTEMS IMMERSION

UNDERGROUND
DAM WALLS, PIPES AND TANKS IN THE GROUND
PAINT SYSTEMS IMMERSION

SALT AND BRACKISH WATER
WITH CATHODIC PROTECTION
HARBORS AND LOCKS
PAINT SYSTEMS IMMERSION

MAINTENANCE PAINT SYSTEMS PAINT SYSTEMS FOR SHIPS NORSOK PAINT SYSTEMS

DurABILITY

ISO 12944 also describes the lifespan of a paint system. This is the time that it takes till the steel parts need a first big maintenance job. This standard durability is expressed in 4 ranges:

Low durability (L): up to 7 years
Medium durability (M): 7 to 15 years
High durability (H): 15 to 25 years
Very high durability (VH): more than 25 years