Deep well high silicon cast iron anode

It is suitable for almost all kinds of environments, such as high silicon, salt water and so on. When the anode current passes through, it will oxidize on its surface and form a thin porous protective film of SiO2, which is extremely acid resistant and can prevent the corrosion of matrix materials and reduce the dissolution rate of anode. However, the film is not resistant to alkali and halogen ions. When the content of chloride ion in soil or water is more than 200 × 10-4%, 4.0% ～ 4.5% should be added CR containing high silicon cast iron. High silicon cast iron anode has poor performance in dry and high sulfate environment because the protective film on the surface is not easy to form or be damaged.

The high silicon cast iron anode has good conductivity. The allowable current density of high silicon cast iron anode is 5 ~ 80 A / m2, and the consumption rate is less than 0.5 kg / A.A. In addition to being used in coke bed, high silicon cast iron anode can also be directly buried in low resistivity soil.

High silicon cast iron has high hardness, wear resistance and erosion, but it is not easy to be machined, so it can only be cast. In addition, it is brittle and easy to be damaged during handling and installation. In order to improve the utilization rate of anode and reduce the "tip effect", the cylinder anode connected in the middle can be used.

The deep well high silicon cast iron anode in impressed current cathodic protection system is suitable for the corrosion protection of metal facilities or metal structures, especially for the corrosion protection of oil field metal casing and pipe network.

Metal equipment and structures are subject to the chemical or electrochemical action of the surrounding corrosive media, which leads to the corrosion and damage of metal equipment and structures. In light, it can form the escape, prosperity, dripping and leakage of liquid or gas, which will affect the normal production and operation, pollute the environment, or even cause explosion and fire, which makes it difficult to guarantee the personal safety and destroy the equipment. Some of the existing cathodic or anode anti-corrosion protection devices, some of which have poor anti-corrosion effect, and some of them have a small scope of application, especially for the anti-corrosion protection of oil and gas, water well casing and pipe network, there is no ideal anode device at present. In some developed countries, deep well anodes are often used for the protection of oil field metal casings and pipe networks. However, the main components of the deep well anodes are made of titanium plated platinum or lithium titanium materials. This anode material is not only difficult to buy, but also expensive and expensive. The deep well high silicon cast iron anode has the advantages of reasonable structure, simple construction, easy management and sufficient anti-corrosion effect.

The main component of the anode of high silicon cast iron in deep well is high silicon cast iron. The composition of various elements and their percentage content by weight are: silicon 13.1-15.4%, manganese 0.62-0.80%, carbon 0.91-1.90%, chromium 3.95-4.90%, phosphorus 0.90-1.50%, sulfur 0.07-0.10%, rare earth 0.003-0.2%, and the rest is iron. The anode is provided with a protective sleeve of the main component, in which a high silicon cast iron body is arranged, which is connected with the joint of the conductive cable (in the form of conductive connection).

In order to facilitate the installation of the deep well anode near the protected metal facilities, and make the construction and installation easy, the protective sleeve can be made of cylindrical metal steel pipe, and the shape of high silicon cast iron body can be cylindrical. In actual use, each set of deep well protection device placed in the well can be equipped with more than one section. The anode of high silicon cast iron anode is connected with each other and assembled jointly Each set of protection device can be equipped with a conical steel pipe leading head, which is placed at the lower end of deep well during field installation and construction.

The cable joint of the anode can be sealed in the body of high silicon cast iron. There is a hole in the upper part of the high silicon cast iron body. One end of the exposed conductor of the cable line, namely the cable joint, is inserted into the cavity. The metal lead or tin is poured into the cavity. The joint of the cable is connected with the cast iron body (conducting connection) and is fixed. In other words, the lower part of the air conditioner is filled with lead or tin. Conductive adhesive is filled on the top of tin or lead, and waterproof adhesive is filled above the conductive adhesive.

In order to improve the reliability and fastening degree of the sealing connection of the cable joint, asbestos board is set at the upper end of the high silicon cast iron body, that is, the upper end of the cavity. Glass steel plate is reinforced on the asbestos board, and the cable can be led out from the hole on the asbestos board and glass plate. High silicon cast iron body can adopt some hollow structure, such as cylindrical tubular structure, which will improve the utilization rate of anode.

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.