Corrosion & Rusting due to Moisture & Humidity

Every year billions of dollars are lost due to Corrosion and Rusting of cargo during transportation and shipment. Metal cargos reach the destination Rusted or Oxidized, due to Moisture and Humidity in the atmosphere.

One of major causes of corrosion is the presence of moisture and humidity. During transportation, presence of humidity takes place because of Temperature Difference. “Change in temperature” may be due to the following reasons:

  • When cargo is loaded in cool atmosphere and then shipped across the equator having different climate zones.
  • When a container cools down in night after moving during hot day in the sun.
  • Difference in temperature may also take place due to difference in temperature between different parts of the cargo.
Effect of Temperature on Humidity

There is maximum amount of moisture that air at a particular temperature, can withhold. If the level of moisture increases beyond this level, its (increased level) will be Condensed as a Fog of tiny droplets, which will either float in the surrounding level or settle as dew on nearby cold surface.

It is the proven scientific fact that, “warm and hot air” has ability to hold more moisture than the “cold air”. Thus, when “warm air” cools down, it becomes more humid, and if there is considerable drop in temperature, condensation will occur, which will result into corrosion.

Relative Humidity (RH)

To what extent the air is humid, depends on its “Relative Humidity”, which is called “RH”.

RH is the percentage of moisture held in the air. “Totally dry air” has RH of 0% and “maximum humid air” has RH of 100%. By and large, there will be no damage to cargo, if RH is less than 60% to 70%.

To protect the metal items from corrosion and rust, it is, therefore, necessary to see that the cargo is properly protected by using “Moisture Barrier Packaging Material” such that RH of the air is not more than 70%, so as not to cause any harm to the metal products.

Protection of Metal Items Against Moisture Damage

The environment of the metal product should be controlled by packing the same in Moisture Barrier Poly Bags. Once the material is enclosed in the sealed bag, little moisture can penetrate inside the bag, thereby giving protection to the metal items.

The “Moisture Barrier Property” of the bags will depend upon what Type of Material is Used. In other words, the type of material used in manufacturing the bag and its thickness, will be an important criterion to the control the level of moisture.

Keeping the metal products inside “Moisture Barrier Bags”, will provide protection to the metal items from humidity. However, apart from humidity, there are several other chemicals in the atmosphere like Acids, Salts and Sulphur, presence of which causes Corrosion.

Ultimate Packaging Solution for Protection from Corrosion

Various Options Available for Corrosion Protection like use of “Oil & Grease”, “VCI Paper” and “VCI Poly Material”. Each option has its own merits and demerits.

Use of “Moisture Barrier Bags” is Another Effective Option for protection of metal. However, such Bags are effective for moisture alone which is present in the atmosphere. It does not give protection if chemicals like acids, salts and sulpha are present in the air.

The Ultimate Packaging Solution is to use “Sealrust VCI® Poly Bags” having moisture barrier properties, which have been developed by Modi Poly and manufactured by using state-of-art technology.

Click the Link -> Sealrust VCI® Poly Bags for details of Plastic Packaging Material having VCI & Moisture Barrier Properties, for long-term protection of metal products from corrosion.

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