Galvanic batteries and metal corrosion, electrolytic cells belong to metal corrosion

The use of galvanic battery principle to remove rust is not a word or two can be made clear, generally speaking, it is not to use galvanic batteries to remove rust, but to use galvanic batteries to prevent metal corrosion, common methods include sacrificing the positive electrode method, such as fixing a zinc plate on the surface of iron, the first corroded is zinc, how to design galvanic batteries is very simple, mainly depends on the actual reaction which is the oxidant which is the reducing agent that is the oxidation reaction that is the reduction reaction, just figure these out, I don't know if you remove silver sulfide with salt water, However, the general method used to remove silver sulfide is to burn, and the galvanic cell reaction is widely used, but it cannot wait until it has been corroded, then it is too late.

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There are many types of corroded batteries and they are complex. Usually according to the size of the electric pole that makes up the corrosive battery, it is divided into two categories: macroscopic corrosive battery and microscopic corrosive battery.

Corrosive batteries are usually "large batteries" made up of larger electrodes that are visible to the naked eye. There are three common ones.

1.Heterometallic contact current When two metals with different electrode potentials come into contact with each other and are in the same electrolyte solution, a large corrosive battery is formed. Most genera with lower potentials become.

The anode is corroded, while the metal with a higher potential becomes the cathode and is protected. In practice, some equipment uses assemblies of different metals, and this contact corrosion may occur. Usually put this.

A type of corrosive battery that is made up of contact with a foreign metal is called a corrosion galvanic couple, and the corrosion caused by it is called galvanic corrosion. In this type of corrosion, the greater the difference in electrode potential between the two metals, the more severe the corrosion.

If the area of the anode is much smaller than the area of the cathode, the corrosion will be accelerated; Conversely, the corrosion rate is reduced and the danger is smaller.

2.Different parts of the same metal, due to the different concentrations of the contact medium, will also form a large corroded battery, which is called a concentration battery. Common aerobic concentration difference battery and salt concentration difference battery.

Generally, the lower concentration of the part has a lower potential, which is the anode of the battery and is susceptible to corrosion. The higher the concentration of the part has a higher potential, which is the cathode of the battery, and will not corrode, such as crevice corrosion described earlier.

3.Temperature difference battery The same metal in the same electrolyte solution, due to the different temperatures of each part, will also constitute a large corrosive battery, called a temperature difference battery.

Corrosive batteries are made by anodes.

The cathode, electrolyte solution and electron circuit are composed of a short-circuit galvanic battery that can only cause the destruction of metal materials and cannot do useful work to the outside world. In this type of battery solution, there are oxygen atoms that can oxidize metals into ions or compounds, which form thermodynamics with metals.

Unstable system. Hope.

The speed of corrosion of metals is related to the liveliness of metals. Metals generally undergo redox reactions with oxygen.

Galvanic corrosion is the same principle as galvanic cells. Sacrifice the anode to protect the cathode.

Galvanic corrosion is the redox reaction of two metals with different reactivity in an electrolyte or joined together in the air. Lively metal reacts first. Much faster than pure metal oxidation reactions.

There are two types of corrosion of metals.

One is chemical corrosion.

It is the chemical reaction between the metal and other substances and the corrosion.

The second is electrochemical corrosion.

It is the metal and the internal impurities that form the galvanic battery under external conditions and undergo an electrochemical reaction and are corroded.

Primary batteries. will chemical energy.

A device that converts into electrical energy. The basic conditions for the composition of galvanic cells are: two metals (or graphite) with different reactivity are connected with wires and inserted into the electrolyte solution.

Galvanic corrosion.

It refers to the corrosion caused by the reaction of the galvanic cell in contact with the electrolyte solution of the impure metal or alloy.

The difference is that galvanic corrosion can constitute galvanic cells. That is, there is an electrode reaction. Whereas, chemical corrosion is just a redox reaction.

A galvanic cell cannot be formed without the necessary two solid electrode materials.

It's all the same principle. Electrochemical corrosion is the formation of galvanic cells, which is essentially anodic corrosion.

The so-called galvanic battery is a device that converts chemical energy into electrical energy, and the battery you use yourself can be called a galvanic battery, which can only be discharged by an external circuit. The corrosion battery is to meet the principle of the battery, there are two different metal materials (positive and negative) and corrosion solutions, constituting the galvanic battery. At the same time, the positive and negative electrodes are connected on the metal surface, and it discharges itself.

It doesn't belong. Because an electrolytic cell is a device that converts electrical energy into chemical energy. In this device, the cathode: must not be involved in the reaction, not necessarily an inert electrode;

Anode: Not necessarily involved in the reaction, nor necessarily an inert electrode.

Please take the above two points seriously.

In the electroplating process, the metal anode loses electrons and dissolves, which can be said to be corroded.

This means that there is a possibility of corrosion in the cell.

But being and belonging are two different concepts.

Electrolytic cells with inert electrodes are not metal corrosion.