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What is Corrosion? 

Corrosion is chemical action which causes destruction of the surface of a material by oxidation or chemical combination. Corrosion Engineering has become an important areaof expertise in Engineering Industry. There are several ways of combating corrosion of which most contemporary, cost effective and advanced, clean and with least environmental and health hazards is the usage of Volatile Corrosion Inhibitors also known as VCI Technology.

 

 

How VCI Works ?


Conventional rust preventives have typically been water-displacing (wax paper), water-absorbing (clay or silica), dehumidification, and barrier products (LDPE/HDPE) that try to alter an ever-changing environment surrounding the metal.VCI technology passivates the metal's surface as well as deactivates the humidity surrounding the metal components.

They have sufficient vapor pressure to evaporate and travel to mix with the humidity, and essentially reach the surface of the metal. VCI molecules become polarized and attract to the anode and cathode.

Once the ions are adsorbed on the surface electro chemicals process of corrosion is sporadic and there is a protective barrier to contaminants such as oxygen.VCI products inhibit the electrochemical process, thereby protecting your costly parts.

Plastics are Porous:-

 

  • LDPE, HDPE etc have porosity of water to the extent of 4 gms/sqm/24 hours/.
  • This phenomenon is often called breathing of plastics. Plastic only acts as a barrier to high amount of humidity entering packaging but is not a full proof system.
  • To make this full proof chemicals need to be present inside the packaging to continuously react with moisture and neutralize it.
  • Corrosion engineering makes it better by analysing that the right amount of chemicals are present in appropriate proximity.

 

Container Rain:- 

  • Using a data logger the analysis shows achievement of 100% humidity conditions in the container.
  • Changes in temperature during the sail causes sudden evaporation and condensation called as Container Rain.
  • Acidic sea humidity causes reaction with metal at much faster rate than components lying in factory floor.
  • Corrosion Engineering makes it possible to decide, use and implement a complete system to counteract the adverse sea conditions.

 

 

Humidity in Boxes:-

  • Starch present in boxes is hygroscopic. It absorbs moisture present in atmosphere to  a tune of 15-60% of the weight of corrugation. Under ambient conditions the moisture levels absorbed in corrugation are always more than 15%.
  • Once the temperature in the container rises, the mositure is released to surrounding metal (being cooler). This further accelerates corrosion of metal if appropriate technology in Rust Preventikon  is not used.
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