Aluminum Vs Copper and Corrosion

[fart_plume]

because zinc is cheap, and zinc does oxidize. And it the the electrical potential with dissimalar metals that marine engineers look at to determine which metals and coatings to use to reduce the effects of galvanic corrosion. From some of the research I've been doing with some water types you won't get galvanic corrosion, but you get bacterial and algeal corrosion. in the another water type(chemical make up) you get accelerated galvanic corrosion but no bio corrosion. There are a great number of things that contribute to corrosion. Even the distilled water from your Wal-mart may have a completely different ph than the distilled water from your local super market. Also maintaining a ph level between 7 & 7.5 is optimal for minimizing corrosion and preventing biologicals in water systems.

[T_Flight]

Also maintaining a ph level between 7 & 7.5 is optimal for minimizing corrosion and preventing biologicals in water systems.

I own a pool and the optimal "perfect" pH that is considered "nuetral (i.e. not acidic or alkaline) is 7.4. I do have pH minus and pH increaser here at the house. I also have a test kit here.

In fact, you have raised my curiosity for an experiemnt. I'm gonna go get my test kit and test that Distilled I got at Walmart and report back what I find. This will be straight out of the jug. bbiaf...

I'll report the brand of water and the ph level in a few minutes. Testing is real easy. I have all the reagents to run all water tests.

[T_Flight]

OK I tested some Walmart Distilled Water that I bought for my new system. It is the cheapest stuff they had at 69 cents a gallon. It has no brand name, but is Steam Distillation Processed by Natural Springs at Hickory Springs in Elloree, SC

I ran full tests on the water and these are the numbers...

Free Chlorine (FC) = 0 (I got no reaction, and no color from the reagents)
Total Chlorine (TC) = 0 (Same deal - No Color, No Reaction)
Combined Chlorine (CC) = 0 (TC-FC=CC)
pH= 7.4 (Balanced)
Total Alkalinity (TA) = Less than 10ppm Calcium Carbonate(ended up proving to be zero after TH test)
Total Hardness (TH) = 0 ppm Calcium Carbonate (No Color Change of Hardness Indicator after adding over 100 drops of Hardness titrant. 100x10 would = over 1000ppm of Calcium Carbonate and I know it's not that high. I stopped at 100.

This is excellent water for a loop. It's balanced and flat on the other numbers. It wouldn't be great for pool water, but for a loop you can't get any better than that.

Basically what all that means is it won't eat on stuff, it contains no chlorates or chlorites, and it won't leave calcium deposits. It's pH balanced which keeps microbials from growing, and stops metalurgic reactions.

I give it an A+!

Short Version?