On the plates inside the battery, sulfate can also irreversibly accumulate. So with each period it accumulates, and in some neglected cases one can see a whole mountain of such a white powder. But on the terminals, he does not go anywhere by himself, because he has nothing to dissolve in. The only difference is that when the battery is charging, the salt deposits from the plates dissolve into the electrolyte. When the battery releases the accumulated energy, exactly the same lead sulfate is formed on its plates, which we observe on the terminals. There is also lead (plates), acid (electrolyte) and electric current (discharge current). And if it also holds a charge poorly by itself, then sulfates on the negative terminal are guaranteed.Ī similar process occurs in the battery itself. The charge voltage is much lower than the rated 14.4 V, and the battery is never fully charged. Firstly, because of the same voltage regulator relay. If sulfates accumulate more at the negative terminal, the battery is often in a weakly charged state. You can verify this by measuring the voltage at the terminals with the engine running. That is, the voltage regulator relay does not work correctly, as a result of which a voltage higher than the normalized 14.4 V goes from the generator to the battery. If sulfates accumulate on the positive terminal, the battery is regularly recharged. According to which terminal salt deposits form, one can say what the battery is “sick of”. In some, sulfates are formed on the positive terminal, in others - on the negative. Not all car owners oxidize the same terminal. The result of this reaction is lead sulfate, which is a white powdery substance that collects on the terminals.īut that's not all. Under the influence of an electric current, lead interacts with acid. To start such a reaction, lead, acid and an electric current are needed. Sulfation of battery terminalsĪ hill of white sulfate with an admixture of blue. But the white coating around the terminals is already noticeable. Most often, no one pays attention to any oxide film. In this case, the ingress of electrolyte has nothing to do with it. This process is called battery terminal oxidation. Normally oxidized terminal If the oxide film is only on top, it is better not to touch It can be seen if you clean the battery terminal to a shine, and then leave it for a while in the fresh air. The result of the interaction of lead and oxygen is an oxidation reaction, which results in the formation of lead oxide. We have lead battery terminals and oxygen. This is also corrosion, but already electrochemical. Metal sulphation is a chemical reaction of a metal, for example, with an acid, in the presence of an electric current, as a result of which sulfates, that is, salts, are formed. Rather, one of its types is oxygen corrosion. Metal oxidation is the chemical reaction of a metal with oxygen, resulting in the formation of oxides or oxides. This is what metal corrosion is familiar to everyone Metal corrosion is a chemical reaction of metal destruction as a result of its interaction with the environment. It’s worth starting with a definition of terms, since it is in them that the confusion lies in relation to the oxidation of battery terminals. And all together this is not called the oxidation of the terminals, but their corrosion. Sometimes the flowing currents are “guilty” of this. Nevertheless, oxygen, and acid, and hydrogen, and even copper leave their traces on the terminals. Oxidation is not from the word acid, but from the word oxygen. At the same time, absolutely no one explains what the acid has to do with the oxidation process. The vast majority of sources on the Internet broadcast to naive motorists that the terminals on the battery are oxidized due to the electrolyte that gets on them.
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