Subject: Re: Flushing afterwards by CentralCoaster on 2008/3/21 21:55:02
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jhammons01 wrote: Distilled water will oxidize (rust) metal just the same....there is oxygen molecules in that H20
It won't be just the same, it'll be way slower.
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Rust and Electrolysis are not the same. Rust particulate will lead to Electrolysis occuring.
Not on its own.
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There is no such thing a PURE water but we can get close. Water itself, Pure H2O is NOT conductive.
Even theoretically pure water is slightly conductive. Every single substance known to man is conductive.
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This contaminate along with the 12v DC charge from your electrical system (remember? We use the block for Grounding that system?) starts a process called Electrolysis.
The DC charge in the coolant from the electrical system is infinitesimal, if even measureable at all, it is nowhere near 12V. To say there's a voltage there would be like saying you've got a voltage difference between one end of the engine block and the other.
There will be a measurable DC voltage if there's galvanic corrosion occuring, whether or not there's a 12V system in operation. In fact, dissolved ions in the coolant would decrease whatever electrical system induced voltage (if any) might occur. High conductivity = lower voltage, remember?
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The Trouble starts with, what will be dissolved?? Softer metals will be first and fastest. All steel coolant systems from the past never had a problem with Tap water. But as we all know, we are now using a lot of aluminum here and there. My '84 has steel heads and Block but the later GM V8s moved to an aluminum block. LT series and the Norstar Motors to name a couple. Mine has aluminum in the radiator and Heater core. (Ever wonder why we have so many problems with that heater core leaking??? I don't.) Read what GM recommends for motors with Aluminum Polypropylene Glycol and not Ethylene Glycol. There is a reason for that.
My understanding is PG is superior to EG, except in cost and freeze point. It will provide the same benefit to any cooling system, aluminum or not. In fact, all-aluminum engines will corrode SLOWER than ferrous metals. Put both metals outside in the rain or salt water and see what corrodes faster.
Also I'm pretty sure your heater core is brass, every other car I've changed one one had brass.
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I'll leave this discussion with one memory. Ever wonder why they sell Distilled water at the grocery store? Did you ever see your Mom with a jug of distilled water?? Ever see her put it in the Iron? Let's add that mystery up.
Iron, Electricity, water.......what could it all mean?
It means you're completely off in left field. Distilled water is used because of it's mineral purity. Irons produce steam. As the water boils off, you're left with a higher and higher concentration of minerals and precipitates. These will foul up your iron in no time and stain your clothes. (Read up on "cycles of concentration"). Now I haven't taken my iron apart, but I'm pretty sure the iron face is aluminum, for its good thermal conductivity. I don't know what the electric heating element is made of, but either way I doubt they'd put any dissimilar metals in contact inside there to cause galvanic corrosion.
