Sacrificial anode cathodic protection technology

Question and answer on cathodic protection technology

. The life of saturated sulfuric acid reference electrodes is generally less than 10 years. According to the different role of potential test pile, current test pile, protection effect test sheet test pile. The reference electrode of saturated copper sulfate and high purity zinc can be used in soil, and the reference electrode of high purity zinc and silver/silver chloride can be used in water. Numerical control high frequency switch potentiostat has the advantages of small volume, small ripple coefficient, high control precision and high efficiency (more than 90%). Aluminum alloy and zinc alloy are mainly used in aqueous medium. The main power supply is constant current, constant voltage rectifier, potentiostat.

1) What are the components of a forced current cathodic protection system?

The sacrificial anode method is a method in which a metal or alloy with a more negative potential than the metal to be protected is electrically connected to the metal to be protected, and the current generated by the continuous erosion of the metal with a more negative potential is relied on to protect other metals.

3) What are the components of the sacrificial anode cathodic protection system?

The main function of the test pile is to test the effect and operation parameters of cathodic protection.

4) What is a sacrificial anode cathodic protection system?

Impressed current cathodic protection system is also known as impressed current system, is near the protected structure unified embedding auxiliary anode, electrolyte environment through power supply for auxiliary anode anode has been flow, in order to be protected as the cathode structure, power supply circuit, will direct current to the protected metal, make the protected metal into the cathode to the implementation of cathodic protection. Zinc alloys can also be used for soils with resistivity less than 5 ω? M.

5) How many kinds of auxiliary anodes are there?

The role of the auxiliary anode is to form an electrical circuit with the medium (such as soil, water), power supply and pipeline through its own dissolution. Thyristor and magnetic saturation potentiostat have large volume, large ripple coefficient, poor control accuracy and low efficiency (less than 70%), which are not easy to be digitized.

6) What are the main sacrificial anodes?

In soil, sacrificial anode cathodic protection system mainly consists of sacrificial anode, filling material, cloth bag, patch, cable and test pile. Other reference electrodes can be designed for life. Magnesium alloy sacrificial anodes are mainly used in high resistivity soil environment. The sacrificial anode is welded directly to the protected structure in the water environment.

7) What is the role of the auxiliary anode?

From the form of rectifier is mainly thyristor, magnetic saturation, CNC high frequency switch.

8) What is the function of the power supply?

The forced current cathodic protection system is mainly composed of power supply, control cabinet, auxiliary anode, coke (carbon) packing, cable, control reference electrode, potential test pile, current test pile, protection effect test sheet, electrical insulation device, electrical insulation protection device.

9) What are the main types of power supply?

The function of the power supply is to provide current to the cathodic protection system without interruption.

10) What controls the reference electrode?

The auxiliary anode is divided according to the medium. There are scrap steel, ferrosilicon, graphite, mixed oxide anode and flexible anode in the soil.

11) Why is electrical insulation needed?

The main control reference electrodes are long life saturated copper sulfate reference electrode, high purity zinc reference electrode, silver/silver chloride reference electrode, molybdenum dioxide reference electrode. There are mixed oxide anode, silicon iron anode and lead anode in the water medium.

The sacrificial anodes mainly include magnesium alloy sacrificial anodes, aluminum alloy sacrificial anodes and zinc alloy sacrificial anodes. In addition to the above deficiencies, the output of the magnetic saturation potentiostat can not be controlled below 20% of the rated power. Molybdenum dioxide reference electrodes are mainly used in concrete.

12) What is the function of the test pile?

In cathodic protection technology, it is required that the protected structure needs electrical insulation, mainly because if it is not insulated, the protection current will be lost to the unprotected metal structure, the design current demand may be insufficient, the protection effect is not ideal, in addition, may produce stray current interference.