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By Pierre R. Roberge

Corrosion is a sort of wear that has observed mankind because the very creation of metals hundreds of thousands of years in the past. Corrosion is usually insidious and hidden till extraordinary on the worst second of a process operation. whereas there are numerous how one can attempt to hinder such harm, the optimal keep an eye on strategy is determined by an early analysis of the issues.

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1. Defects And Failures 35 accidents could have been prevented if proper maintenance and inspection had been carried out. 1. Bhopal Accident Bhopal is probably the site of the greatest industrial disaster in history. Between 1977 and 1984, Union Carbide India Limited, located within a crowded working class neighborhood in Bhopal, was licensed by the Madhya Pradesh Government to manufacture phosgene, monomethylamine, methylisocyanate, and the pesticide carbaryl, also known as Sevin. In the early morning of December 3, 1984, water inadvertently entered the methylisocyanate storage tank, where >40 metric tons of methylisocyanate were being stored.

FORMS OF CORROSION Corrosion can take many forms (Fig. 6), and the statistics associated with each will be different. The actual importance of each corrosion type will also differ between systems, environments, and other operational variables. However, there are surprising similarities in the corrosion failure distributions within the same industries as can be seen by comparing Fig. 7a and b. Both corrosion failure distribution charts represent data for two large chemical plants, but they are from two different continents.

In much industrial equipment, a corrosion rate of 25 µm year−1 for steel is quite acceptable, whereas, such amounts of rust from the point of view of the food industry would be unacceptable. As another example, in the development of a burial site for storing radioactive waste a corrosion failure would occur if a minimum amount of radioactivity would leach in the groundwater after somewhere in the range of 10 to 1 million years. Thus, the overall concept of failure in this context may have nothing to do with the integrity of the storage container, but everything to do with the transport of radioactive species in the surrounding environment.

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