Weathering and Aging of Paint

This chapter presents a brief overview of the major mechanisms that cause aging, and subsequent failure, of organic coatings. Even the best organic coatings, properly applied to compatible substrates, eventually age when exposed to weather, losing their ability to protect the metal. 

In real-life environments, the aging process that leads to coating failure can generally be described as follows  

Even more transportation of water, oxygen, and ions through the coating. 

Deterioration of coating-metal adhesion at this interface. 

Development of an aqueous phase at the coating/metal interface. 

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Blast-cleaning and other heavy surface pretreatments Abrasive blasting and heavy-metal contamination Weathering and aging of paint... 

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