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It has now become a known fact that hundreds of thousands of coil failures have occurred during the last decade due to corrosion. The cause is most typically environmental pollutants, which range anywhere from salt-air, to household cleaning agents, pesticides, formaldehydes, building materials, and even off-gassing of food. Each of these contaminant sources can initiate corrosion in coil tubing in a year or less when the conditions are right.

Kinds of corrosion:

The two most common forms of coil corrosion are pitting and formicary. These two corrosive processes can occur in as little as a few weeks after installation. More typically, corrosion will begin appearing within a one to four-year period.

Choosing Corrosion Protection:

Choosing the most appropriate coil coating for the application could save the project thousands of dollars and eliminate repeat treatments. Choosing the wrong coil coating could reduce heat transfer capabilities and lead to higher energy bills

all aluminum heat exchangers big 2
all aluminum heat exchangers big 2


Water based self-etching epoxy resin-based coating is available in Grey colour, can be coated on all ferrous and nonferrous metals (as used in HVAC&R coil manufacturing) to give long term corrosion protection.

Types of I-Coat:

  • Hydrophobic i-coat:

    A permanent super hydrophobic surface improves condensation characteristics and allows for faster run off the condensate which improves heat transfer. It also reduces dirt and dust consolidation thereby reducing cleaning of the coil.

  • Hydrophilic i-coat:

    Due to hydrophilic surface the condensate on the aluminium fin will quickly spread and will not condense into water droplets, enables water droplets to flow off the surface without facing a lot of resistance to air flow.

Colour of i-coat: Grey

Advantages of “i – coat”:

  • Corrosion Protection:

    The entire surface of the coil is protected, including tubes, which remain free of corrosion allowing the coil to maintain its long-term heat exchange efficiency.

  • Reduce Mould and Bacteria:

    The coating contains permanent Ag+ technology (Ag+ = silver ion) reducing mould and bacteria growth within the coil. The coil stays clean and free of micro-biological contamination.

  • Very Thin:

    The coating is only 20 +/- 5 microns which does not affect heat exchange or air flow.

  • Certification:

    NSF Certification Standard 51 Food Equipment contact

all aluminum heat exchangers big 2

Technical Performance:

Corrosive Tests Results

‘i- coat’

ASTM B117 Salt Spray, 3000 Hrs


ASTM G85-A5, 2000 Hrs



Featuresi - coat

Water based






Solvent additions

Water Only

Clean up


Adhesion to coil components

Excellent/Self etching

Thickness of deposited film

20-25 microns

Penetration of coil block

100%Full immersion

Penetration of fin collar/tube zones