Originally Posted by ihatelolcats
ok i put about 1/3 of 50/50 antifreeze in. hopefully that is enough to prevent problems. its the green kind so it glows and looks cool under UV
but id' still like to know,
why isnt zinc a good solution?
Zinc won't work. What you're talking about is refereed to as a sacrificial anode. The problem with mixing metals is they have what's called their standard electrode potential, and cathodic metals will leach electrons from anodes. The leaching of electrons will drastically increase the corrosion rate of the anode.
Here are the following electrode potentials of the metals you've said your using in order from anodic to cathodic:
Notice how Aluminum is more anodic than Zinc? yeah.....
You'd need something along the lines of calcium, or magnesium in your loop to act as a sacrificial anode, but once you start throwing things like that in your loop you're playing with fire, and I'm sure you know what they say about playing with fire.
Use an ethylene glycol coolant. I don't recommend using car antifreeze, as vehicles are designed to run at ultrahigh deltatemps. The coolant in your cars system is around 195fahrenheit, about 95.5celsius, and the components your vehicle is cooling are even hotter than that. Beyond that, it not only is designed to decrease freezing temp, but also to increase it's boiling point. You're cooling a PC, in which the lowest possible temps is your goal. You don't want all the extra crap in the antifreeze that's going to reduce performance.
Ethylene Glycol does break down into toxic byproducts during digestion, so do keep that in mind.
Some of the Fesser Ethylene glycol coolants will work, or if you have pets/small children Mayhems XT-1 Ethylene glycol based concentrates are non toxic.
They will act as a corrosion inhibitor and keep all that extra crap out of your loop. (Ethylene glycol will also act as an antifreeze)Edited by ZytheEKS - 9/18/13 at 9:55pm