Posted by Wardner on January 15, 2010 at 15:48:32 from (4.154.245.93):
In Reply to: Re: Rusted wheels posted by CNKS on January 15, 2010 at 13:31:23:
It all depends on whether the surface temperature of the metal drops below the dew point of the air. When that happens, the moisture in the air will condense on the part. The same thing happens to a cold beer can.
Generally speaking sheet metal is OK for extended periods of time. It can change its surface temperature radidly to match ambient air temperature. Castings and heavy steel sections can't absorb heat fast enough to avoid condensation when warm moist air displaces long periods of cold air.
It only takes a fraction of a degree either way to be safe or sorry.
So when the weather forcast says 100% relative humidity, watch out. Even in New England, that condition is rare. When it is raining here, the hunidty is likely to be 80-95%. This means that metal parts have a margin of safety in terms of temperature differential. Fog and clouds are always saturated and consequently run at 100% humidity.
Parts that are not cleaned to true white metal will discolor in short order at low humidity. If one looks carefully at the imperfect surface, one can see the individual rust cells that are actually "worm holes" that have not been cleaned out. They will be black.
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