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Corrosion in India
The corrosion map of India was prepared by the Corrosion Advisory Bureau, Metals Research Committee (Council of Scientific & industrial Research) Jamshedpur.
The map describing corrosion patterns in India shows macroscopic differences between areas, with coastal regions being the most severe, Adjusant areas are Severe.
In A.P. some of coastal/non coastal city's buildings may be more corrosion-prone and hence structurally less stable than they seem, a recent study done by the Central Electrochemical Research Institute (CECRI), Karaikudi, says.
As per the updated corrosion map of India drawn by CECRI scientists, The first place goes to Sriharikota on the AP coast and Chennai is the second most corrosion-prone city/town in the country.
What this means is that those buildings in the city which have not been made specially corrosion resistant might be in for considerable trouble.
CECRI, State corrosion protection committee has a surprise finding some Non-coastal Cities/Towns in India found the most corrosion-prone places in the country too.
The study is part of an ambitious effort by CECRI to update the country's corrosion map - 35 years after it was first drawn up by the National Meteorological Laboratory, Jamshedpur - to enable design engineers and other metal users to go opt for less-corrosion-prone materials.
Corrosion is a natural impact of atmospheric environments like marine, industrial, urban and rural and affects the structural stability of buildings. The annual loss due to corrosion can be compared with that of other natural calamities like earthquakes and cyclones, only its impact is indirect. Loss due to corrosion has been reported to account for more failures in terms of cost and tonnage than any other environment.'' The overall loss due to corrosion alone amounts to at least 2 to 4 percent of GNP and at least 25 percent of this could be avoided by using appropriate corrosion-control technology. As a first measure, 33 field stations were set up throughout the country in places like Vishakapatnam, Sriharikotta, Manali, Chennai, Pondicherry, etc.
Metal panels of different materials like mild steel, zinc, galvanized iron and aluminium were exposed to the air and annual corrosion rates in millimeters per year (mmy) were determined in correlate with atmospheric pollutants and climatic factors.
Based on the findings, three categories were drawn up: extremely corrosive corrosive moderately corrosive. While Sriharikotta recorded 1.6mmy, Chennai touched 0.5 mmy, Mormogao 0.45 mmy, Mettupalayam 0.3mmy and Port Blair 0.38 mmy.The mild steel panel at the Chennai naval base, for example, was found to have decreased in size from 2.5mm to 0.5mm in just eight months. Under the corrosive category fell Manali, Mangalore, Mandapam, Tuticorin and Kochi.
Normally it is only coastal cities that are prone to corrosion. In the case Non coastal areas too have considerable damage with corrosion.
New structure should use for anti corrosion add mixtures like CRPPC / ConLife / equivalent developed and patented by CECRI (Govt. of India.) CECRI products use has already been made mandatory for constructing bridges in maharashtra state.
The four other towns in this "extremely severe" category are Sriharikota, kakinada, visakapatnam Chennai, Marmugoa and Port Blair - all in the coastal region.
Corrosion leads to shorter life for steel structures, the institute says the corrosion data is immensely useful for design engineers.
