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Air-Oil Systems Newsletter
July 2010 
                      
Fabco Logo 
 
   Fabcoat Cylinder
 
                 Fabcoat Cylinder Whitepaper
                       
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Greetings!
 
FABCO-AIR, Inc. now offers proprietary coatings for their aluminum air cylinder product lines, providing a cost effective alternative to stainless steel. In rigorous life-cycle testing, coated aluminum products were well protected against the effects of harsh environments. For a fraction of the cost of 303 or 304 stainless air cylinders.

Two Fabco-Air coating approaches are presented here for your consideration.

Fabcoat-1205 General Corrosion Resistance
PancakeŽ II cylinder with protective finish
Fabcoat-1205 is designed to provide protection against galvanic corrosion that is caused by atmospheric and environmental conditions such as high humidity, acid rain, salt spray and salt air.

Galvanic Corrosion
In basic terms, galvanic corrosion occurs when dissimilar metals are in contact or near proximity to each other and are exposed to moisture or even high humidity. The less noble of the two metals will corrode preferentially while the more noble material will remain essentially undamaged. For example, an aluminum cylinder end cap will corrode while the steel fasteners that hold the assembly together do not.
The rate at which galvanic corrosion occurs increases greatly when the moisture contains salt or acid. Think of galvanic corrosion as a battery. The less noble material is the anode, the more noble material is the cathode and the water is the electrolyte. Water containing salt or acid, for example, is more conductive than tap water and is therefore a better electrolyte.

Barrier Protection
Fabcoat-1205 provides a unique barrier film to prevent galvanic corrosion of dissimilar metals. It encapsulates the component to which it is applied and provides a non-conductive surface similar to the jacket on an electrical wire. Because it is chemically bonded to the substrate, it provides a highly durable, watertight shield against the elements.

Appearance
Fabcoat-1205 provides a durable, smooth silver finish that is similar in appearance to natural stainless steel or aluminum.

Performance
  • 500+ hours ASTM B-117 salt spray protection.
  • Excellent protection against UV light degradation.
  • Will not blister or lose adhesion when exposed to intermittent or continuous humidity
  • Provides excellent protection against detergents, solvents, lubricants and fluids
 
Fabcoat-327 Caustic and Oxidizer Protection
Unprotected steel, aluminum and even some grades of stainless steel can be damaged by cleaning solutions. Fabcoat-327 is designed to protect components against the harmful effects of detergents, caustic cleaners, and oxidizers (bleach) that are commonly used in the food service industry.
Failure mechanisms of unprotected metals or common finishes:
  • Stress Corrosion - Cleaning solutions can cause intergranular oxidation within the microstructure of metals. It may not be obvious to the naked eye. Components can fail when placed under load.
  • General Corrosion - Protective finishes such as plating or coating can be removed with repeated washing. Once removed, bare components are susceptible to general corrosion.
  • Removal of Passive Oxide Surface - Aluminum and stainless steel rely on a passive oxide layer on the surface of the component for corrosion protection. Cleaning solutions can  penetrate or remove this layer drastically reducing corrosion resistance.
Appearance
Fabcoat-327 provides a durable silver finish that is similar in appearance to natural
stainless steel or aluminum.

Performance
  • 500+ hours ASTM B-117 salt spray protection.
  • 28 Hours 5% sodium chloride immersion with no stress corrosion cracking.
  • Will not blister or lose adhesion when exposed to intermittent or continuous humidity.
  • Provides excellent protection against detergents, solvents, lubricants and fluids.
 
Learn more about Fabco-Air products or contact us for additional information.
 
                 
          Order Fabco Pancake Cylinders Online                  
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      Publisher            newsletter@airoil.com               Phone: (800) 333-5520   
  
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