Explain the difference between pitting corrosion and normal corrosion?

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Explain the difference between pitting corrosion and normal corrosion?

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Tire wear on a car is a good analogy. Normally, the tire tread will wear down uniformly over the years and the tire will last as expected. However, if a nail were to puncture the tire, in effect causing excessive tire wear at one point, even a new tire can fail long before it should. On a copper pipe, corrosion usually eats away at the surface slowly and uniformly—in the case of copper pipe it will normally last hundreds if not thousands of years. “Pitting” is said to occur when excessive corrosion occurs at a small area on the pipe surface, causing the pipe to fail in as little as a few months under some very rare instances.