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Manufacturing Industry

Characteristics of rust.(TECH NOTES)

Advanced Materials & Processes,  June, 2007  

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It is likely that rusting occurs more during the night when atmospheric moisture condenses on metal surfaces when the dew point is reached. On average, in the Midwest and middle Atlantic states up through Canada, a 5.5 to 8.3[degrees]C (10 to 15[degrees]F) drop in temperature when the daytime relative humidity is around 75% is sufficient to result in condensation at night.

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The moisture absorbs the gaseous contaminants of the local atmosphere and nucleates around a dust particle, and thus brings an acidic droplet to the metal surface. The thin acidic moisture film is capable of ...

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