The lifespan of a powder coating on CNC machined parts can vary significantly depending on several factors:  

l Powder Coating Type: Different powder formulations have varying degrees of durability. Some are designed for high-performance applications with enhanced resistance to abrasion, chemicals, and UV radiation.  

l Application Environment: Exposure to harsh weather conditions (sun, rain, snow, salt spray) can accelerate degradation. Industrial environments with high levels of chemicals or abrasive particles can also shorten the coating's lifespan.

l Substrate Material: The type of metal substrate (steel, aluminum, etc.) and its surface preparation can influence the coating's adhesion and longevity.  

l Coating Thickness: Thicker coatings generally offer better protection against wear and tear, but may be more susceptible to chipping or cracking. 

l Maintenance and Care: Regular cleaning and maintenance can help to extend the life of the powder coating.