Corrosion Accident In Bhopal Tragedy

Corrosion accidents:- Bhopal tragedy

Corrosion and its types:

A BASIC QUESTION

What is Corrosion ????

DEFINATION:

Corrosion is a natural process, which converts refined metal to their more stable oxide. It is the gradual destruction of materials (usually metals) by chemical reaction with their environment. In the most common use of the word, this means electrochemical oxidation of metal in reaction with an oxidant such as oxygen.

Corrosion is the phenomenon of a metal or an alloy to undergo destruction or degradation by its interaction with the surrounding environment. Many structural alloys corrode merely from exposure to moisture in air, but the process can be strongly affected by exposure to certain substances. Corrosion can be concentrated locally to form a pit or crack, or it can extend across a wide area more or less uniformly corroding the

Their general chemical structure is R-N=C=O. Methyl isocyanate (CH3-N=C=O) is a monoisocyanate (in this case, R is CH3). The existence of adjacent double bonds confers high reactivity to isocyanates by a cumulative action. That is why MIC is very toxic. All isocyanates are toxic, and their toxicity is greater following inhalation than following oral ingestion. MIC is the most toxic member of the isocyanate family. At room temperature, MIC is a colorless liquid. MIC is flammable; its molecular mass is 57.05, specific gravity 0.96 relative to water at 20°C, vapour pressure 348 mm Hg (464 mbar) at 20°C and vapour density 1.97 relative to air. The boiling point of MIC is 39.1°C, which implies that some MIC will vaporize at a room temperature of 23°C and all of it can exist as vapor in Bhopal on certain hot days of the summer. Because MIC is odorless, contact with it is noted only because of toxicity.The Occupational Safety and Health Administration in the United States has set exposure limits to MIC as0.02 ppm (or 0.05 mg/m3) during an