Decision help 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.

Show all Baril paint systems

 

C1.png
VERY LOW CORROSIVITY
INDOORS
DRY AIR AND CLEAN
INDOOR CLIMATE

steel C1/C2

C2.png

LOW CORROSIVITY
INDOORS AND OUTDOORS
UNHEATED BUILDINGS AND NATIONAL
DRY AREAS

steel C1/C2

 

C3.png

AVERAGE CORROSIVITY
INDOORS AND OUTDOORS
PRODUCTION SPACES WITH HIGH HUMIDITY CITIES 
AND LIGHT INDUSTRIAL ENVIRONMENTS WITH MODERATE POLLUTION

steel C3

C4.png

HIGH CORROSIVITY
INDOORS AND OUTDOORS
SPACES WITH A VERY HIGH HUMIDITY LIKE SWIMMING POOLS
LIGHT INDUSTRIAL ENVIRONMENTS WITH POLLUTION, NOT NEAR THE COAST

steel C4 galvanized steel C4

 

 

 C5.png

VERY HIGH CORROSIVITY
OUTDOORS
COASTAL AREAS AND AREAS WITH HEAVY INDUSTRY
A LOT OF POLLUTION AND HIGH HUMIDITY

steel C5 galvanized steel C5

CX.png

EXTREME CORROSIVITY
OUTDOORS
MARINE AND OFFSHORE, VERY AGGRESSIVE ATMOSPHERE
EXTREME HUMIDITY AND POLLUTION OF THE ENVIRONMENT

steel CX

 

 

IM1.png

FRESH WATER
RIVERS, WATER
POWER PLANTS

IMMERsion

IM2.png

SALT AND BRACKISH WATER
WITHOUT CATHODIC PROTECTION
HARBORS AND LOCKS

IMMERsion

 

IM3.png

UNDERGROUND
DAM WALLS, PIPES AND
TANKS IN THE GROUND

IMMERsion

IM4.png

SALT AND BRACKISH WATER
WITH CATHODIC PROTECTION
HARBORS AND LOCKS

IMMERsion

 

Other paint systems

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