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I read somewhere that rusting of iron is greatly retarded below some minimum threshold of relative humidity. I think that midwestern rusting of cars comes from a combination of salt in the winter and high humidity in the summer. Ah! Here's an interesting graph -- the second one, rust: http://www.drytech.com.tw/english/ess_main.htm This graph tells the story that oxidation rate really kicks in at 60% RH. Does anyone know about the adsorption[sic] of water on iron under typical conditions? (Is there a surface chemist in the house?) At typical pressure and temperatures, does a percolation cluster just begin to form at those intermediate RH values? -Greg ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/