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

• 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.  
• 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.
• Substrate Material:The type of metal substrate (steel, aluminum, etc.) and its surface preparation can influence the coating's adhesion and longevity.  
• Coating Thickness:Thicker coatings generally offer better protection against wear and tear, but may be more susceptible to chipping or cracking.  
• Maintenance and Care:Regular cleaning and maintenance can help to extend the life of the powder coating.