Why Do Car Batteries and Car Battery Terminals Corrode?

Posted by

What Causes Does There Appear Corrosion on Car Battery Terminals?

why is my car battery corroded

Many car owners notice white or blue bloom on their car batteries and battery terminals while examining them. It’s called corrosion. Every car owner who faces the problem for the first time in his/her life wants to find out why there appeared corrosion. There also occur such questions as: “Why did there appear corrosion on my car battery?”, “What are the conditions under which there can appear corrosion?” and “What does corrosion on car battery terminals mean?”

In this article, we’ll tell you about the differences between white and blue corrosion. We’ll also provide information on when such like corrosion appears and what it means. In other words, we’ll tell you what you should do if you notice corrosion on your car battery.

Why Do Car Batteries and Car Battery Terminals Corrode

As a rule, when a car owner notices corrosion on a car battery, he/she is recommended replacing the car battery with a new battery. However, corrosion may appear on your car battery not only because the battery is old. There are other reasons that, if not eliminated, will lead to the appearance of corrosion on your new car battery. Most often, corrosion occurs due to one of the following reasons: misuse of the vehicle itself, depreciation of a car battery and the fact that you don’t pay enough attention to the technical state of your car.

Corrosion may appear on the negative and positive battery terminal. It may also appear on your car battery itself. Of course, there is a different reason for each of the cases mentioned. Besides, the technical state of your car battery also differs in each of the cases.

Blue Corrosion on a Car Battery

Blue corrosion appears on the positive car battery terminal. Actually, the colour may vary from light blue to greenish-blue. As for the consistency of the corrosion, it’s very much like the consistency of a paste.

what causes car batteries to corrode

Blue corrosion – is the sulphate of copper. It becomes blue in colour due to the fact that there is moisture. Most often, the corrosion occurs when there starts a chemical reaction between the copper (car battery terminals are made out of material that has copper in it) and moisture. In other words, there is a chemical reaction between the moisture that there is and the car battery terminal that’s connected to the battery. This type of corrosion rarely appears on new car batteries because, in the majority of cases, these are electric current and sulphuric acid that contribute to the beginning of the reaction. The electric current comes through battery terminals and the sulphuric acid may leak out of the car battery itself. In case you notice blue corrosion, you’re recommended to check the level of your car battery’s charge. Maybe, the overcharged car battery is the reason for the occurrence of blue corrosion.

If you notice blue corrosion on your car battery, you need to clean it off regularly. The sulphate of copper “blocks” the flow of current. Consequently, if you don’t clean it off on time, the electrical devices in your car may start functioning improperly. It’s very easy to say if there is corrosion on your car battery. You don’t even need to get under the hood of your car to do it. The most obvious signs that there is something wrong are the following: there is a dim light coming from your headlamps and parking lights as well as each time you use turn signals. If you want to know about how to clean your car battery and its terminals off corrosion, you can read the following article: The easiest way to get rid of corrosion is to make soda solution. It’s exactly soda that “dissolves” the sulphate of copper. Before you start the procedure, don’t forget to disconnect your car battery from your car. Actually, you’d better take it out of your car so that the solution doesn’t get on any parts of the battery.

White Corrosion on a Car Battery

White corrosion appears on the negative battery terminal. It occurs less often than the blue corrosion. It occurs on the car batteries of those cars that aren’t used for a long time. White corrosion looks like a kind of powder. Unlike blue corrosion, white corrosion occurs when the level of a car battery’s charge is low. All car owners know that a car battery get automatically charged while they’re driving their cars. However, if there are lots of devices in a car that need energy and you don’t use your car to get to the places that are far away, not every car battery will manage to keep the necessary level of charge.

why do car batteries corrode

Under what conditions does white corrosion appear? Everything is simple here. When you’re driving your car, there appear small molecules of sulphate on the car battery. These molecules don’t influence the way your car battery functions if the battery manages to keep the necessary level of charge. If your car battery was discharged for a long time, the molecules will turn into crystals. The crystals get inside the car battery and replace the active material that’s inside it. It leads to your battery being broken down. You already understood that white corrosion occurs on the inner plates of a car battery. The corrosion occurs on the negative battery terminal the moment when sulphuric acid leaks out of your car battery.

What should you do in case you notice this type of corrosion? It’s hard to give the exact answer to the question. If the corrosion is soft, you may try cleaning it off. After it, you need to charge your car battery. The charging process should last longer than it usually does. In case the corrosion is hard, it’s very likely that you’ll be unable to do anything.

Why Does a Car Battery Have Corrosion?

If there occurs corrosion on the surface of your car battery, maybe there are small cracks through which the electrolyte is leaking out. In this case, you’re recommended to disconnect your car battery, take it out of your car and examine it carefully.

why do car battery terminals corrode

The best recommendation we can give to every car owner is to regularly examine car battery and clean off even the smallest “bits” of corrosion on time. If you want to know how to clean corrosion off car battery terminals and what other conditions for the occurrence of the corrosion are, read the following articles:

How to Prevent Corrosion On a Car Battery?

How To Clean Corrosion Off A Car battery and Car Battery Terminals?

How to Prolong Car Battery Life?

One comment

  1. I’ve recently bought a new car. I used my previous car for 18 years and I constantly faced one and the same problem – corrosion. I tried to clean in off in different ways. I cleaned the corrosion off once in 2 months. It didn’t help. Now I have a new car and no such like a problem.

Leave a Reply

Your email address will not be published. Required fields are marked *