Impressed current cathodic protection, how do you protect metal? Keep it energized?

In engineering, the commonly used reference electrodes are copper/saturated copper sulfate, silver/silver halide and zinc reference electrodes, etc., these reference electrodes have their own characteristics, combined for different occasions. Generally, when the working condition of the structure to be protected (such as the immersed area, water quality, etc.) is basically unchanged or changes very little, you can use the manually controlled rectifier; But when the working condition of the structure is often changing, the potentiostat should be used automatically to make the potential of the structure always in the best protection range. These materials have their own characteristics and are used in different situations. Magnetic saturation potentiostat fastening durable, overload capacity is strong, but the volume is relatively large, processing technology is more complex.

Reference electrode

The role of the auxiliary anode is to transfer the DC current output from the DC power supply from the medium to the metal structure to be protected.

Dc power supply

Impressed current cathodic protection system consists of the following parts: (1) DC power supply, (2) auxiliary anode, (3) reference electrode.

Impressed current cathodic protection, what do you do when you're protecting metal?

. Many materials can be used as auxiliary anodes, such as scrap steel, graphite, lead-silver alloy, high-silicon cast iron, platinum-coated titanium, platinum-coated niobium, and mixed metal oxide electrodes. Transistor potentiostat output is stable, no noise, high control accuracy, but the circuit is more complex.

In an impressed current cathodic protection system, an uninterrupted DC power supply is required to provide the protection current.

The reference electrode has two functions: on the one hand, it is used to measure the potential of the protected structure and monitor the protection effect; On the other hand, the control signal is provided for the automatically controlled potentiostat to adjust the output current, so that the structure is always in a good state of protection. At present, there are two widely used rectifier and potentiostat.

It needs one, or it won't protect you. SCR potentiostat has large power and small volume, but its overload capacity is not strong.

Auxiliary anode

There are three kinds of potentiostat widely used in engineering: SCR potentiostat, magnetic saturation potentiostat and transistor potentiostat. A method of protecting the protected metal by using the protected metal as the cathode and a specific material as the auxiliary anode. In addition, in order to make the anode output protection current more average, to avoid the structure around the anode produced over protection, sometimes near the anode also must be coated with anode shielding layer

Impressed current cathodic protection is to provide the required protection current by an applied power source.