CN209759593U - Metal material anti-corrosion device under seawater environment based on magnetic field assistance - Google Patents

Abstract

the metal material anticorrosion device based on magnetic field assistance in the seawater environment comprises a power supply, wherein the negative electrode of the power supply is connected with a metal matrix, and the power supply is used for providing the cathode potential of the metal matrix; the negative electrode of the power supply is connected with the auxiliary anode; a magnetic field generator for applying a magnetic field to the metal matrix to make the metal matrix contain Fe²⁺The corrosion products of (a) adsorb to the surface, inhibiting corrosion of the metal substrate. In seawater, the cathode potential of the metal matrix is provided by a power supply, the auxiliary anode and the seawater electrolyte form a current loop, and a magnetic field is applied to the metal matrix by a magnetic field generating device, so that the metal matrix contains Fe²⁺Corrosion products ofThe substance is adsorbed on the surface to inhibit the corrosion of the metal matrix, so that the metal matrix is protected. The utility model discloses not only can effectively restrain the metal matrix in the sea water, like the corruption of iron-based steel equipment, can prolong the life of metal matrix equipment moreover, increase the maintenance cycle of equipment.

Description

Anti-corrosion device for metal materials in seawater environment based on magnetic field assistance

technical field

The utility model relates to the technical field of protection of metal materials in seawater environments, in particular to a magnetic field-assisted anticorrosion device for metal materials in seawater environments.

Background technique

In recent years, my country's marine industry has developed rapidly, and it is inevitable to use a large number of metal equipment in the ocean, such as water pipelines for seawater pumped storage power stations, oil pipelines, steel structures of cross-sea bridges and other metal equipment. Seawater is a medium and strong corrosive dielectric solution, and its corrosiveness is far more than that of river water and rainwater, and its high conductivity makes the corrosion battery have a wide range of action. Metal equipment is exposed to the harsh corrosive environment of the ocean for a long time, and it is prone to corrosion and damage. These destructions have brought great distress to our lives, and even brought economic losses and safety problems.

Cathodic protection technology is the most widely used in marine corrosion protection. Cathodic protection is to provide a certain amount of electron flow to the protected metal in a certain way for cathodic polarization, so that the potential of the metal will be shifted negatively, so that it is in a thermodynamic stable zone, thereby reducing or preventing the corrosion of the metal due to oxidation reaction. chemical protection methods. However, the corrosion of the ocean is still serious and needs to be improved.

Contents of the invention

In view of the above, the utility model provides a magnetic field-assisted anticorrosion device for metal materials in a seawater environment, that is, on the basis of the existing cathodic protection technology, a magnetic field is applied around the metal substrate as the cathode. When the corrosion reaction occurs on the surface of the metal substrate, since the Fe ²⁺ ions in the corrosion products have a magnetic moment, the corrosion products containing Fe ²⁺ will be adsorbed on the surface of the metal substrate under the action of a magnetic field, thereby inhibiting the further corrosion of the metal substrate.

The technical scheme that the utility model takes is:

Anti-corrosion device for metal materials in seawater environment based on magnetic field assistance, including:

Power supply, the negative pole of the power supply is connected to the metal substrate, and the power supply is used to provide the cathode potential of the metal substrate;

Auxiliary anode, the positive pole of the power supply is connected to the auxiliary anode;

The magnetic field generating device is used to apply a magnetic field to the metal substrate, so that the corrosion products containing Fe ²⁺ in the metal substrate are adsorbed on the surface, and the corrosion of the metal substrate is inhibited.

The magnetic field generator is an electromagnet.

The magnetic field generating device is composed of a conductive wire applied on the surface of the metal substrate.

The current passing through the electromagnet and the energized wire adopts a pulse type, a direct current type, or an alternating current type.

The magnetic field generator is a permanent magnet.

The magnetic field generating device applies a magnetic field to the metal substrate, or the easily corroded part of the metal substrate, or the joint between the metal substrate and other alloy equipment.

The metal matrix is iron-based steel or iron-based alloy.

Based on the anti-corrosion method of metal materials in seawater environment assisted by magnetic field, in seawater, the cathode potential of metal matrix is provided by power supply, so that the auxiliary anode and seawater electrolyte form a current loop, and a magnetic field is applied to the metal matrix through a magnetic field generator to make the metal matrix contain Fe. The corrosion products of ²⁺ are adsorbed on the surface, inhibiting the corrosion of the metal matrix, so that the metal matrix is protected.

The magnetic field applied by the magnetic field generating device is an electromagnetic field, and the method of applying the electromagnetic field is as follows: placing an electromagnet on the surface of the metal substrate; or winding or laying a current-carrying wire on the surface of the metal substrate to be protected to generate a magnetic field.

The magnetic field generating device is a permanent magnet, which is placed on the part of the surface of the metal substrate that needs to be protected.

The utility model is a magnetic field-assisted metal material anticorrosion device in seawater environment, and the technical effects are as follows:

1: It can not only effectively inhibit the corrosion of metal substrates in seawater, such as iron-based steel equipment, but also prolong the service life of metal substrate equipment and increase the maintenance cycle of equipment.

2: Compared with traditional cathodic protection measures, the utility model can better inhibit the corrosion of metal matrix equipment in seawater. Compared with methods such as adding fungicides, the method of the utility model does not pollute the marine environment, and has sustainable development of utilizing the marine industry.

3: The magnetic field generating device of the present utility model can adopt a variety of ways to apply a magnetic field, such as generating a magnetic field through an electromagnet or a permanent magnet, and a different way of applying can be selected according to the actual situation.

4: The scope of use of the utility model is relatively wide. For large-scale marine facilities with a large area, such as seaport import and export gates, submarine transportation pipelines, ship bottoms, etc., large-area laying wires can be used to generate electromagnetic fields, so as to realize magnetic field-assisted cathodic protection technology. Not only that, permanent magnets can be used to realize magnetic field-assisted cathodic protection technology for places where power supply is difficult or for small-scale marine facilities. When the permanent magnet is used to generate the magnetic field, no external power supply is needed, which saves energy.

5: The utility model can use permanent magnets in the joints of iron-based steel or other alloy equipment, or in places that are prone to corrosion, which is not only anti-corrosion but also easy to install.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Fig. 1 is the schematic diagram of the principle of the utility model device.

Fig. 2 is a schematic diagram of the way that the device of the present invention adopts an electromagnet to apply a magnetic field.

Fig. 3 is a schematic diagram of a method of applying a magnetic field by winding a energized coil in the device of the present invention.

Fig. 4 is a schematic diagram of a method of applying a magnetic field in a tiled manner of electrified coils in the device of the present invention.

Fig. 5 is a schematic diagram of the way that the device of the present invention adopts a permanent magnet to apply a magnetic field.

Detailed ways

Principle analysis:

Cathodic protection is to provide a certain amount of electron flow to the protected metal in a certain way for cathodic polarization, so that the potential of the metal will be shifted negatively, so that it is in a thermodynamic stable zone, thereby reducing or preventing the corrosion of the metal due to oxidation reaction. chemical protection methods. Based on the existing cathodic protection technology, the utility model applies a magnetic field around the iron-based steel as the cathode. After the corrosion reaction occurs on the surface of the iron-based steel, because the Fe ²⁺ ions in the corrosion products have a magnetic moment, the corrosion products containing Fe ²⁺ will be adsorbed on the surface of the iron-based steel under the action of a magnetic field, thereby inhibiting the further corrosion of the iron-based steel . The magnetic field can be applied by electromagnets or permanent magnets. This anti-corrosion method can not only slow down the corrosion of iron-based steel, but also is environmentally friendly and does not endanger the ecological balance of the ocean. Be further illustrated by the following three examples:

Example 1:

As shown in Figure 1 and Figure 2, the anti-corrosion device for metal materials in seawater environment based on magnetic field assistance includes:

A power supply 3, the negative electrode of the power supply 3 is connected to the metal substrate 1, and the power supply 3 is used to provide the cathode potential of the metal substrate 1;

Auxiliary anode 2, the positive pole of power supply 3 is connected to auxiliary anode 2,

The auxiliary anode 2 is used to transmit the protection current provided by the power supply 3 equipment to the surface of the metal substrate 1 to be protected via seawater. The auxiliary anode 2 material should have the following properties: good electrical conductivity and high electrochemical activity; low consumption rate and long life; sufficient strength, not easy to damage; light weight, easy to handle and install; easy to process and shape, and cost-effective; anode Materials and corrosion products are environmentally friendly and pollution-free. The auxiliary anode 2 is specifically made of scrap iron and steel, graphite, magnetic iron oxide, high-silicon cast iron, lead alloy, platinum, mixed metal oxide, and conductive polymer.

The power supply 3 adopts a DC power supply, mainly including a rectifier and a potentiostat. The rectifier is the simplest cathodic protection power supply device, which can rectify the external alternating current into low-voltage direct current, and can realize continuous adjustment of output current and voltage. The potentiostat can automatically adjust the size of the output current according to the change of external conditions, so that the protected metal substrate 1 is always within the set protection potential range. The potentiostats mainly used in the project include thyristor potentiostat, magnetic saturation potentiostat, high-power transistor potentiostat and switching power supply potentiostat. In special occasions, power sources 3 such as solar cells, wind generators, and tidal energy generators can also be used for impressed current cathodic protection.

The magnetic field generating device is used to apply a magnetic field to the metal substrate 1, so that the corrosion products containing Fe ²⁺ in the metal substrate 1 are adsorbed on the surface, and the corrosion of the metal substrate 1 is inhibited.

The magnetic field generating device is an electromagnet 4, and the electric current adopted by the electromagnet 4 includes: pulse type, direct current type, and alternating current type.

The magnetic field applies a magnetic field to the metal substrate 1, or the easily corroded part of the metal substrate 1, or the joint between the metal substrate 1 and other alloy equipment. This can not only effectively control corrosion but also save costs.

The metal matrix 1 is iron-based steel or iron-based alloy. After a corrosion reaction occurs on the surface of the metal substrate 1, since the Fe ²⁺ ions in the corrosion products have a magnetic moment, the corrosion products containing Fe ²⁺ will be adsorbed on the surface of the metal substrate 1 under the action of a magnetic field, thereby inhibiting the further corrosion of the metal substrate 1 .

Example 2:

As shown in Figure 1, Figure 3, and Figure 4, the anti-corrosion device for metal materials in seawater environment based on magnetic field assistance includes:

A power supply 3, the negative electrode of the power supply 3 is connected to the metal substrate 1, and the power supply 3 is used to provide the cathode potential of the metal substrate 1;

The auxiliary anode 2, the positive pole of the power supply 3 is connected to the auxiliary anode 2, and the auxiliary anode 2 is used to transfer the protection current provided by the power supply 3 equipment to the surface of the metal substrate 1 to be protected via seawater. The auxiliary anode 2 material should have the following properties: good electrical conductivity and high electrochemical activity; low consumption rate and long life; sufficient strength, not easy to damage; light weight, easy to handle and install; easy to process and shape, and cost-effective; anode Materials and corrosion products are environmentally friendly and pollution-free.

The auxiliary anode 2 is specifically made of scrap iron and steel, graphite, magnetic iron oxide, high-silicon cast iron, lead alloy, platinum, mixed metal oxide, and conductive polymer.

The power supply 3 adopts a DC power supply, mainly including a rectifier and a potentiostat. The rectifier is the simplest cathodic protection power supply device, which can rectify the external alternating current into low-voltage direct current, and can realize continuous adjustment of output current and voltage. The potentiostat can automatically adjust the size of the output current according to the change of external conditions, so that the protected metal substrate 1 is always within the set protection potential range. The potentiostats mainly used in the project include thyristor potentiostat, magnetic saturation potentiostat, high-power transistor potentiostat and switching power supply potentiostat. In special occasions, power sources 3 such as solar cells, wind generators, and tidal energy generators can also be used for impressed current cathodic protection.

The magnetic field generating device is used to apply a magnetic field to the metal substrate 1, so that the corrosion products containing Fe ²⁺ in the metal substrate 1 are adsorbed on the surface, and the corrosion of the metal substrate 1 is inhibited.

The magnetic field generating device is composed of a metal substrate 1 with a conducting wire 5 applied on the surface. The current used by the energizing wire 5 includes: pulse type, direct current type, and alternating current type.

Fig. 3 is the way of winding the conducting wire 5 on the surface of the metal substrate 1, which can protect the metal substrate 1 in a large area and adsorb Fe ²⁺ on the surface of the metal substrate 1; The helical motion is performed under the action of the Lenz force, thereby delaying the interaction between the seawater ions and the metal matrix 1 .

Fig. 4 shows the method of laying the conducting wire 5 on the surface of the metal substrate 1, which does not require the surface shape of the metal substrate 1, is easy to lay, and can also protect the metal substrate 1 with a large area.

The magnetic field applies a magnetic field to the metal substrate 1, or the easily corroded part of the metal substrate 1, or the joint between the metal substrate 1 and other alloy equipment. This can not only effectively control corrosion but also save costs.

The metal matrix 1 is iron-based steel or iron-based alloy. After a corrosion reaction occurs on the surface of the metal substrate 1, since the Fe ²⁺ ions in the corrosion products have a magnetic moment, the corrosion products containing Fe ²⁺ will be adsorbed on the surface of the metal substrate 1 under the action of a magnetic field, thereby inhibiting the further corrosion of the metal substrate 1 .

Example 3:

As shown in Figure 1 and Figure 5, the anti-corrosion device for metal materials in seawater environment based on magnetic field assistance includes:

A power supply 3, the negative electrode of the power supply 3 is connected to the metal substrate 1, and the power supply 3 is used to provide the cathode potential of the metal substrate 1;

The auxiliary anode 2, the negative pole of the power supply 3 is connected to the auxiliary anode 2, and the auxiliary anode 2 is used to transfer the protection current provided by the power supply 3 equipment to the surface of the metal substrate 1 to be protected via seawater. The auxiliary anode 2 material should have the following properties: good electrical conductivity and high electrochemical activity; low consumption rate and long life; sufficient strength, not easy to damage; light weight, easy to handle and install; easy to process and shape, and cost-effective; anode Materials and corrosion products are environmentally friendly and pollution-free. The auxiliary anode 2 is specifically made of scrap iron and steel, graphite, magnetic iron oxide, high-silicon cast iron, lead alloy, platinum, mixed metal oxide, and conductive polymer.

The power supply 3 adopts a DC power supply, mainly including a rectifier and a potentiostat. The rectifier is the simplest cathodic protection power supply device, which can rectify the external alternating current into low-voltage direct current, and can realize continuous adjustment of output current and voltage. The potentiostat can automatically adjust the size of the output current according to the change of external conditions, so that the protected metal substrate 1 is always within the set protection potential range. The potentiostats mainly used in the project include thyristor potentiostat, magnetic saturation potentiostat, high-power transistor potentiostat and switching power supply potentiostat. In special occasions, power sources 3 such as solar cells, wind generators, and tidal energy generators can also be used for impressed current cathodic protection.

The magnetic field generating device is used to apply a magnetic field to the metal substrate 1, so that the corrosion products containing Fe ²⁺ in the metal substrate 1 are adsorbed on the surface, and the corrosion of the metal substrate 1 is inhibited.

The magnetic field generating device is a permanent magnet 6 placed on the surface of the metal substrate 1 to be protected. It is suitable for marine facilities where power supply is difficult or the area is small. The permanent magnet 6 material includes: alloy permanent magnet material, rare earth permanent magnet material, ferrite permanent magnet material.

The metal matrix 1 is iron-based steel or iron-based alloy. After a corrosion reaction occurs on the surface of the metal substrate 1, since the Fe ²⁺ ions in the corrosion products have a magnetic moment, the corrosion products containing Fe ²⁺ will be adsorbed on the surface of the metal substrate 1 under the action of a magnetic field, thereby inhibiting the further corrosion of the metal substrate 1 .

Based on the above-mentioned embodiment 1, embodiment 2, or the metal material anticorrosion method under the seawater environment of embodiment 3,

In seawater, the negative pole current is provided to the protected metal substrate 1 through the power supply 3, the positive pole of the power supply 3 is connected to the auxiliary anode 2, and the negative pole is connected to the protected metal substrate 1, and the protection current reaches the protected metal substrate 1 from the auxiliary anode 2 through the seawater electrolyte Surface (protected electron flow continuously supplements the surface of the protected metal substrate 1 to prevent the material of the protected metal substrate 1 from losing electrons and being oxidized, while the auxiliary anode 2 continuously absorbs electrons from seawater and continuously provides them to the power supply to form a loop), A current loop is formed, and a magnetic field is applied to the metal substrate 1 through a magnetic field generator, so that the corrosion products containing Fe ²⁺ in the metal substrate 1 are adsorbed on the surface, and the corrosion of the metal substrate 1 is inhibited, so that the metal substrate 1 is protected.

Claims (7)

1. An anti-corrosion device for metal materials in a seawater environment based on magnetic field assistance, characterized in that it includes: a power supply (3), the negative pole of the power supply (3) is connected to the protected metal substrate (1), and the power supply (3) is used to provide the metal substrate (1) ) cathode potential; The auxiliary anode (2), the positive pole of the power supply (3) is connected to the auxiliary anode (2), and the auxiliary anode (2) is used to transmit the protection current provided by the power supply (3) to the surface of the protected metal substrate (1) via seawater; The magnetic field generating device is used to apply a magnetic field to the metal substrate (1), so that the corrosion products containing Fe ²⁺ of the metal substrate (1) are adsorbed on the surface, and the corrosion of the metal substrate (1) is inhibited. 2. The anticorrosion device for metal materials in seawater environment based on magnetic field assistance according to claim 1, characterized in that: the magnetic field generating device is an electromagnet (4). 3. The anti-corrosion device for metal materials in seawater environment based on magnetic field assistance according to claim 1, characterized in that: the magnetic field generating device is composed of a metal substrate (1) and a conductive wire (5). 4. The anti-corrosion device for metal materials in seawater environment based on magnetic field assistance according to claim 3, characterized in that: the current-carrying wire (5) is wound or laid flat on the metal substrate (1). 5. The anticorrosion device for metal materials in seawater environment based on magnetic field assistance according to claim 1, characterized in that: the magnetic field generator is a permanent magnet (6). 6. The magnetic field-assisted anticorrosion device for metal materials in seawater environment according to claim 1, characterized in that: the magnetic field generating device applies a magnetic field to the metal substrate (1), or the easily corroded part of the metal substrate (1), or The connection between the metal matrix (1) and other alloy equipment. 7. The anti-corrosion device for metal materials in seawater environment based on magnetic field assistance according to claim 1, characterized in that: the metal matrix (1) is iron-based steel or iron-based alloy.