Shulou(Shulou.com)11/24 Report--

Original title: "take off the coat of canned Coke, will you still know it?" | serious play "

Many people like to drink Coke.

But Coke cans are the same.

Can't show our cool personality.

So today, the editor is going to teach you a method.

Unlock the hidden skin of the Coke can in two steps

Experimental equipment: cola cans, beakers (large capacity water cups), toilet cleaning, sandpaper, disposable chopsticks

The first step of the experiment is to polish the paint layer off the surface of the cola can with sandpaper to expose the aluminum layer below.

This step is more hands-consuming, it is recommended to wear disposable gloves, there are no disposable gloves at home can use the hands of friends.

Tips: the cola in the can can play a good role in supporting the can, do not drink it in advance, otherwise the can is easy to deform during polishing and it is not easy to remove the clean paint layer. Step 2: adding Clean toilet Spirit to the beaker will make it more effective, but leave room to prevent the Coke can from spilling.

Use disposable chopsticks to pass through the pull ring of the Coke can and put the Coke can on the beaker.

After a while, bubbles can be seen, indicating that the aluminum layer has begun to corrode.

Let's give the experiment time and wait for 86400s to see the results.

If you lift the coke can carefully, you can see that the aluminum layer on the red line has been completely corroded, and the liquid inside can be seen through the can body.

Other parts of the aluminum layer are now so fragile that they can be easily erased.

It can be seen that there is a sharp contrast between the transparent part and the opaque part.

Principle explanation the principle used in this small experiment is mainly the corrosion of aluminum by acidic liquid. Metal aluminum is a more active metal, which can easily react with acids to form hydrogen and aluminum salts. The chemical equation is

The aluminum salt formed by the reaction dissolves into the solution.

Coke cans are made of metal aluminum, and there is a polymer coating on the inner surface of cola cans. The main components of this coating are epoxy resin or other chemically stable polymers. On the outer surface of the cola can is a layer of printing ink. First of all, we use sandpaper to polish the surface of cans, on the one hand, to polish off this layer of ink. On the other hand, because the metal aluminum in the air is very easy to form a dense alumina film on the surface to protect the internal aluminum. So sanding with sandpaper can also destroy this layer of dense alumina film, exposing the internal metal aluminum.

The cleaning toilet spirit and scale remover used in our daily life all contain a certain amount of strong acid, which can be used to corrode the aluminum of Coke cans. In the end, there is only a polymer coating on the inner surface (so there is a film inside Coke in addition to Coke! )

Finally, don't drink the Coke after the experiment.

This article comes from the official account of Wechat: Institute of Physics, Chinese Academy of Sciences (ID:cas-iop). Author: Ah Yi & Little p&iu

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