Introduction Before any metal is immersed, it is usually exposed for some time to the atmosphere. During this period the metal normally reacts with the oxygen present in the air and forms an oxide film. It may also combine with any moisture and dissolved gases in the atmosphere to produce surface films. The presence of these surface layers affects the rate, and possibly the distribution, of any subsequent corrosion. Hence the formation of surface films in the atmosphere is discussed before the corrosion of immersed lead.
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