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Why corrosion of iron is a serious problem ?

 The formation of Iron oxide leads to weakening of the metal bonds, which causes damage to the metal structure or object and 
* gradually leads to the disintegration of the metal. 
* Rust shortens the life of any metal object. 
* Rust will increase the maintenance cost of a metal object or structure substantially. 
* Rust leads to malfunctioning of expensive machinery, causing the rusted metal part not move or slide. 
* Rust certainly decreases the aesthetic value of any metal object, as rusted objects look trashy. 
*At times rust can also cause holes in metal objects especially metal sheets. *In cars, this problem is quite troublesome as it may cause disruption of the car functioning. Rust eats away the metal from the underside of the car as it bears the maximum brunt of severe weather conditions. 
* In electrical gadgets the iron objects may not work properly when it is affected by rust. As rust does not conduct electricity it can be the cause of electrical gadgets not working. 
*The magnetic properties of rust are less than iron it therefore also hampers the working of gadgets that use magnets.
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it reduces the quality and durability of iron
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That's an easy question: because everything in our civilization is made of iron or one of its alloys, from vehicles to buildings, from tools to prosthesis, everything is made of iron.

When you study corrosion science history, you realized it started byasking "why does iron rust?". NACE, the most important organization of Corrosion Engineers has crunch the numbers, and the amount (only in USA) is in the order of billions!

You have to consider the low cost iron has respect other metals, you realize why its use is so widespread; and if you include all he avences done in metallurgy during the last century you can see how scientists have made great efforts in improving its durability: new alloys with better resistance to corrosion and higher strength; treatments to delay corrosion and even try to replace it with new materials where possible.

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Iron reacts with atmospheric moisture to form an oxide the engineering properties decline proportionally with the Magnitude of corrosion hence the stability of structure decreases therefore it's a serious phenomenon.
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