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<blockquote data-quote="Jay Barracato" data-source="post: 48545" data-attributes="member: 24">Re: Water damage... causesPhil,The basic difference (I believe) in our two points of view is that I think you are referring to the case where an external potential is present to do work on the system. For my thought problem I was working on &quot;corrision&quot; as being the spontaneous reaction. In a completely anoxic environment, dissimilar metals alone is not enough to cause the reaction, with the exception of an extremely slow process where hydrogen is the reduced material.I believe that the reduction of O2 to water has a greater E value than the reduction of O2 to hydroxide. Therefore with no external current present the reaction with O2 to produce H2O will take place until the O2 is depleted. If an external current is present, than the reaction with the lower E (H2O to OH-) will take place. As you pointed out, once the oxygen is depleted the rate of reaction drops by several orders of magnitude as the source of the material to be reduced becomes a surface chemistry problem.In 1982? a guy I knew, knew his boat was sinking, killed all the power before being picked up by a nearby boat. A couple of months after being submerged in the ocean, the electronics came up basically unharmed. On the other hand it is not uncommon to have a couple of volts through the water in a salt water marina. Sinking in the slip would be far more damaging.Your point about the replenishment of the oxygen is probably more on track for the thin layer of moisture that was probably a cause in the OP&#039;s problem.</blockquote>

[QUOTE="Jay Barracato, post: 48545, member: 24"] Re: Water damage... causes Phil, The basic difference (I believe) in our two points of view is that I think you are referring to the case where an external potential is present to do work on the system. For my thought problem I was working on "corrision" as being the spontaneous reaction. In a completely anoxic environment, dissimilar metals alone is not enough to cause the reaction, with the exception of an extremely slow process where hydrogen is the reduced material. I believe that the reduction of O2 to water has a greater E value than the reduction of O2 to hydroxide. Therefore with no external current present the reaction with O2 to produce H2O will take place until the O2 is depleted. If an external current is present, than the reaction with the lower E (H2O to OH-) will take place. As you pointed out, once the oxygen is depleted the rate of reaction drops by several orders of magnitude as the source of the material to be reduced becomes a surface chemistry problem. In 1982? a guy I knew, knew his boat was sinking, killed all the power before being picked up by a nearby boat. A couple of months after being submerged in the ocean, the electronics came up basically unharmed. On the other hand it is not uncommon to have a couple of volts through the water in a salt water marina. Sinking in the slip would be far more damaging. Your point about the replenishment of the oxygen is probably more on track for the thin layer of moisture that was probably a cause in the OP's problem. [/QUOTE]

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