Principle of sacrificial aluminum alloy anode protection system

TIME£º2020-11-29 15:23:53

Anode protection is a very common protection method in real industrial production, and with the deepening of industrial production and the continuous progress of science and technology, the corresponding anode protection system has been gradually developed and produced. The aluminum alloy sacrificial anode protection system is one of the most effective and popular systems. So, what is the principle of aluminum alloy sacrificial anode protection system?

Aluminum alloy sacrificial anode method is to connect a metal with more negative potential on the protected metal as the anode, and protect the cathode by the electrons generated by the continuous dissolution of the anode. The operation principle of the protection system is mainly shown in the following aspects:

1¡¢ As aluminum alloy sacrificial anode metal: its electrode potential is required to be negative enough to cause a certain driving voltage than the protected metal; the theoretical power generation of anode is required to be high, the anode capacitance is large, and the electricity generated by anodic dissolution is large; the anode must have high current efficiency, and high current efficiency means that most of the electricity generated by anodic dissolution is used for cathodic protection Protect.

2¡¢ A complete current loop is composed of sacrificial anode and protected metal through cable. In this circuit, the sacrificial anode outputs current to the protected metal, and the effective output current of the sacrificial anode polarization can be measured in this circuit. This is an electrochemical galvanic cell, in which the potential is relatively negative and is accelerated corrosion. The metal ions generated by anodic dissolution are reflected in the medium environment, and the released electrons are transmitted to the protected metal surface through the cable noodles.

3¡¢ When the potential of the metal is suppressed, the metal is protected by the cathodic protection. At the same time, the cathodic process on the protected metal surface is accelerated. The accelerated cathodic reduction reflects the consumption of electrons transported by the dissolution of sacrificial anode, which realizes the charge balance between the anode process and the cathode process of the battery, so that the cathodic protection process can continue continuously.

4¡¢ In the electrolyte environment, a permanent reference electrode is set near the protected metal, which forms a complete potential circuit with the protected metal through the test cable to measure the protective potential of the protected metal. The cathodic protection detection station (test pile) is composed of the measurement system of protection current and protection potential, as well as the anode grounding resistance, anode potential, and the actual current flowing through the pipeline.

Obviously, each element of sacrificial anode cathodic protection system is very important. However, sacrificial anode material is the most important basic element, which determines the driving voltage of cathodic protection of the protected metal and the current amount of anode, thus determining the cathodic protection potential and the effective degree of cathodic protection of the protected metal.

Shandong Linyi Bosi conductive materials Co., Ltd. is a high-tech enterprise specializing in the production of MMO flexible anode, conductive polymer flexible anode and titanium coated anode, mainly providing corrosion protection, cathodic protection, engineering design, installation and technical services.

Prev£º Common sacrificial anode protection materials

Next£º Practical application of sacrificial anode in daily life