Will Battery Acid Eat Aluminum?

      by Phil Borges // in Articles

It is a common misconception that battery acid will eat through metal. Battery acid contains sulfuric acid, which can corrode aluminum, but it does not consume the metal. The corrosion process takes place over time, and there are many other factors that contribute to how quickly an object will corrode in battery acid. This post discusses the nature of battery acids, what they do to metals like aluminum, and tips for minimizing corrosion damage on your car or boat while storing them outdoors.

Does acid eat aluminum?

When battery acid comes into contact with aluminum, it will erode the metal. The degree of damage depends on such factors as time and concentration of the acid. Aluminum is very soft, so it is easily eroded by most acids. The coating of aluminum on steel or iron can also be damaged quickly if the acid comes into contact with those surfaces as well.

Battery acid is a mixture of water, sulfuric acid, and other chemicals. This acid contains corrosive properties that can eat away aluminum or any metal for that matter if it is left in contact with the material long enough. This corrosion process will continue until there are no more ions to consume from the metal.

Although it is possible for battery acid to eat away aluminum, the amount of damage done depends on how long the substance comes into contact with the metal and at what concentration level. The longer battery acid stays in contact with aluminum or any other metal, the more likely there will be a significant loss in mass which can lead to holes if left to do its damage for long enough.

How do you neutralize battery acid on aluminum?

You can neutralize battery acid by using some solutions:

-Use water to neutralize battery acid.

-Pour water into any other exposed drains and dilute the solution of sodium bicarbonate, followed by a final water rinse.

-After about minutes, wash off the neutralized acid with plenty of clean running water.

- Use a stiff bristle brush to remove any remaining traces of acid.

Will battery acid eat through metal?

This is a common question we hear, and the answer varies depending on what type of metal, how long it's in contact with acid, and to some degree what kind of battery acid.

Battery acid is an electrolyte that can cause a chemical reaction with metals. This helps the battery generate electricity through its movement of ions between different parts of the electrodes inside it. Due to this, there are several types of batteries in use today for various purposes. They have variations in their composition, but they all share one thing: corrosive acids.

Now, let's look at what happens when you mix these acids with various metals.

Let's look at aluminum - an extremely common metal that is also very reactive to battery acid. Aluminum corrodes in the presence of battery acid, giving off hydrogen gas. This can be an issue since aluminum is used for many different types of automotive components. The process speeds up dramatically in contact with battery acid.

The corrosion process can be expedited in two ways - by increasing the surface area of the aluminum exposed to the electrolyte or by keeping it wet over a longer period of time. This means that if you have an aluminum object submerged in battery acid (or any other corrosive liquid) for too long, its chances of corroding are much higher.

What does sulfuric acid do to aluminum?

Metals react with acids to liberate hydrogen gas. Similarly, aluminum also reacts with sulphuric acid to liberate hydrogen gas.

As a result, aluminum dissolves in sulfuric acid to form an electrolyte solution of aluminum ions.

However, it does not dissolve rapidly because there are no other positive metal ions present in the acidic medium. The process is slow and depends upon temperature as well as surface area. Hence it can be prevented by using smaller pieces that have a greater surface area.

It is commonly seen that the aluminum objects corrode at a faster rate when exposed to air and water due to their reaction with these reagents. However, sulfuric acid has the ability to dissolve aluminum metal very slowly but continuously. Hence it can be used as a protective coating for certain metals like iron or steel, which are not resistant to acid.


Battery acid is corrosive. The acid will corrode anything it comes into contact with, including aluminum. Aluminum can be eaten away by battery acid if sufficient time and concentration of the liquid are present. Although this corrosion process may happen slowly over time, you should exercise extreme caution when working around large quantities of batteries or other sources of acidic liquids.

If a battery gets damaged and starts leaking electrolyte solution, immediately clean up the area with water and baking soda to neutralize the spilled liquid that might have come into contact with your skin or eyes. If you can access the battery, remove it and keep it away from children. If your car is parked indoors, ventilate the area by opening windows or using fans. These precautions are necessary because inhaling the vapors from a highly acidic substance can be hazardous to your health. If you notice any signs of corrosion on an aluminum surface, such as bubbling or pitting, deal with it immediately.

About the Author

Hi, I'm Phil Borges.. thanks for reading.. My wife says I can't shut up about batteries so to save my marriage I've started this blog .. where I'd be ranting about batteries! Please leave a comment if you have any questions, I'm happy to help!

Learn more about [your subject]. Start Now!

E-book 01
E-book 02