Saturday, May 3, 2014

ALUMINIUM FINS COATINGS FOR HVAC IN DELHI/ INDIA

WHAT IS CORROSION?

            Corrosion is the chemical reaction of a metal, in this case aluminum, with its environment, which leads to the deterioration of the properties of metals.
          Corrosion accounts for approximately 40% of all equipment failures in industrial facilities. Facilities located in potentially corrosive outdoor environments such as seacoast, heavily populated urban areas, industrial sites, some rural locations are exposed to various threats of salt laden corrosive elements, various air borne molecular contaminants (AMC) and water vapor (as a result of high relative humidity). Few other environments such as laundry facilities, diesel-burning devices/exhaust piping, sewer vents, traffic, pool areas, water treatment facilities and household cleaning agents etc. can also produce corrosive atmospheres resulting in the creation of electrolytes that facilitates the corrosion process. These pollutants, in combination with other factors such as wind direction, humidity, water, fog, temperature, proximity to pollutant source, and dust or particle contamination, may result in the premature failure of equipment. Premature corrosion of air conditioning heat exchangers, specifically condenser coils can be a serious problem. Coils installed in these environments have been known to fail in less than 1 year. The result is the costly replacement of the coil and/or the entire unit. If these units are left unprotected, they can experience rapid corrosion from exposure to aggressive elements.

ALUMINIUM AND CORROSION
            Aluminum is a very reactive metal, but it is also a passive metal. This contradictory nature is explainable because aluminum reacts with oxygen or water and forms a coherent surface oxide which impedes further reaction of aluminum with the environment.

CAUSES OF CORROSION
·       Humidity
·       Temperature
·       Gases such as hydrogen sulfide, sulfur oxides, chlorine, hydrogen
      Fluoride (HF), nitrogen oxides and ammonia

HOW TO PREVENT ALUMINIUM COILS CORROSION


Pre-coated Aluminum-Fin Coils
Pre-coat processes sheet aluminum before it is manufactured into coils. Pre-coats are not a very good long-term coating solution because the manufactured edges are not coated and are therefore exposed to corrosive forces. This results in a rapid deterioration of the coil. In addition, the application of a pre-coat prior to manufacture precludes the effective application of any other type of coating to the coil. Pre-coating offers protection in mildly corrosive coastal environments when compared to standard uncoated coil, but is not recommended in severe industrial or coastal environments.
Post-coated Aluminum-Fin Coils
There are two methods for applying post-coat coatings: dipping or spraying. All coatings applied by a dip process must be applied at a factory. Products are immersed into product baths a set number of times and for specific durations, then either baked or allowed to cure naturally. Spray processes can be done either at the factory or in the field.

We Automotive Solutions give " ALUMINIUM GUARD"  a coating for all your needs.


MERITS OF ALUMINIUM GUARD
·       Easily applicable
·       Suitable for ferrous & non – ferrous metals
·       Resistant to UV and Chemical Reactions

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