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<blockquote data-quote="Phil Graham" data-source="post: 48565" data-attributes="member: 430">Re: Water damage... causesThe literature, case studies, and engineering consultancies are full of all kinds of examples of these types of concentration differences being real, and causing corrosion issues. Every textbook on corrosion has a section on pitting corrosion, and pitting corrosion results from these local concentrations effects.I&#039;m not making this stuff up. I have engineering friends working on this type of corrosion activity daily, and at one point interviewed to work on this type of corrosion with an engineering consultancy. There are ASTM standards that describe the nature of different types of pitting corrosion due to local concentration effects attacking the passivating oxide.At no point in the pedagogy of classical thermodynamics, Gibbs style, does the forward and backward reaction rate come into play. Gibbs determines the equilibrium state from equations of state and chemical potentials. Guldberg&#039;s work on the law of mass action is contemporary with Gibbs&#039; work, but it approaches the idea from a different place. Take the two, add in Arrhenius&#039; work on activation energy, and the more modern considerations of statistical thermodynamics, and everything melds together of course. But when you use HSC, chemSAGE, solgasmix, or any of the other chemical equilibrium calculation means, they are calculating activities based on Gibbs&#039; approach.Be my guest, but I struggle to see how that relates to the corrosion processes of the original poster. All of the effects I have discusses are practical potential methods that could have lead to the onset and ongoing corrosion of Ryan&#039;s compression driver.</blockquote>

[QUOTE="Phil Graham, post: 48565, member: 430"] Re: Water damage... causes The literature, case studies, and engineering consultancies are full of all kinds of examples of these types of concentration differences being real, and causing corrosion issues. Every textbook on corrosion has a section on pitting corrosion, and pitting corrosion results from these local concentrations effects. I'm not making this stuff up. I have engineering friends working on this type of corrosion activity daily, and at one point interviewed to work on this type of corrosion with an engineering consultancy. There are ASTM standards that describe the nature of different types of pitting corrosion due to local concentration effects attacking the passivating oxide. At no point in the pedagogy of classical thermodynamics, Gibbs style, does the forward and backward reaction rate come into play. Gibbs determines the equilibrium state from equations of state and chemical potentials. Guldberg's work on the law of mass action is contemporary with Gibbs' work, but it approaches the idea from a different place. Take the two, add in Arrhenius' work on activation energy, and the more modern considerations of statistical thermodynamics, and everything melds together of course. But when you use HSC, chemSAGE, solgasmix, or any of the other chemical equilibrium calculation means, they are calculating activities based on Gibbs' approach. Be my guest, but I struggle to see how that relates to the corrosion processes of the original poster. All of the effects I have discusses are practical potential methods that could have lead to the onset and ongoing corrosion of Ryan's compression driver. [/QUOTE]

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