Temperature Effect on Corrosion Protective Coatings

Temperature Effect on Corrosion Protective Coatings

Low temperatures

There are three general detrimental characteristics to be considered for coatings under cold temperature:

• Adhesion,
• Shrinkage, and
• Brittleness

High temperatures

High temperature and cyclic high temperature create problems for coating application  as well. It may cause chloride containing polymers, such as PCV and chlorinated rubber, hydrolyse and leach hydrochloric acid.  Some , e.g. styrene polymer, may tend to depolymerize and evaporate from the metal surface. Epoxies can over cure at high temperature will become brittle, shrink and lose adhesion. Only  some special types of coating is endured for high temperature application:IOZ  and silicon polymer are stable at temperature up to 370^oC.  Silicon polymer can be heat resistant to 520^oC for short period of time (days /weeks). Polysiloxane coating may have higher temperature resistant up to 1079^oC

Typical Temperature Range for Coatings