How does metal corrotion work

[JorgeSuarez]

I don't get it, if mixing metals like copper and aluminum is a bad thing, why do some companies just send aio coolers with a copper waterblock and a aluminum radiator?

[emosun]

becuase it's 50$ and they dont care if it breaks

[Himommies]

The usually a special coolant or some type or aluminum alloy.Remeber the warranty on these are 5 years so thats how long they should last

[TVwazhere]

7 minutes ago, JorgeSuarez said:

I don't get it, if mixing metals like copper and aluminum is a bad thing, why do some companies just send aio coolers with a copper waterblock and a aluminum radiator?

AIO manufacturers fill their coolant with a lot of anti-corrosives and completely seal them, so they actually tend to last quite a while. Longer than the pump anyways, which is usually the reason you'd ever get rid of an AIO for a defect. 

(Video starts at relevant point)

 

[SilicateWielder]

 

Just now, Himommies said:

The usually a special coolant or some type or aluminum alloy.Remeber the warranty on these are 5 years so thats how long they should last

Basically this, corrosion is a chemical reaction that damages metals, it's natural however you can add additional metals or particles that help to prevent this from happening. The coolant AIOs use will typically have some additives to slow the process that way by the time it fails you will likely have already upgraded your computer

[W-L]

34 minutes ago, JorgeSuarez said:

I don't get it, if mixing metals like copper and aluminum is a bad thing, why do some companies just send aio coolers with a copper waterblock and a aluminum radiator?

As mentioned they use the proper coolant which is essentially ethylene glycol in the correct proportions to help prevent corrosion. However that only last for a certain amount of time so the lifespan of AIO's are not indefinite.