Can cables in electrical equipment be easily corroded, can other materials be used instead?

Yes, this requires the corrosion resistance of the cable to be extremely high, Huier alloy cable to meet this demand, and to meet the electrical performance standards of copper cables, but also to reduce the cost of procurement Technical knowledge we can communicate more ......

It mainly depends on the usefulness of your cable. Some cables can be replaced with bronze medals. But most of them are not good, because they are easy to corrode, and can be replaced with corrosion-resistant cables.

Cables used in corrosive environments should be made of metal layer, reinforcing layer, and cable with polyethylene outer sheath on the armor.

Code for Design of Power Engineering Cables GB50217-2007 stipulates as follows:

The selection of cable sheath should meet the following requirements:

1. When it is necessary to enhance the external force resistance of the cable for AC system single-core power cable, non-magnetic metal armor layer should be selected, and steel armor without non-magnetic effective treatment should not be selected.

2. In the humid, chemically corrosive environment or susceptible to water immersion of the cable, its metal layer, reinforcing layer, armor should have a polyethylene outer sheath, and the thick steel wire armor of the cable in water should have an extruded outer sheath.

3. In densely populated public facilities and places with low toxicity and flame retardant fire protection requirements, halogen-free outer sheath such as polyvinyl chloride or ethylene propylene rubber can be selected.

When there is a requirement of low toxicity for fire prevention, it is not advisable to use the PVC outer sheath.

4. In addition to the low temperature environment below -150C or the place where the pharmaceutical chemical liquid is immersed, and the cable extrusion outer sheath with low toxicity and flame retardancy requirements should be polyethylene, other polyvinyl chloride outer sheath can be selected.

5. XLPE cables of 6 35kV importance or above 35kV used in places soaked in water or chemical liquids shall have radial waterproof structures such as metal-plastic composite water-blocking layer and metal sleeve that meet the requirements of use.

Medium and high voltage XLPE cables laid underwater should have a longitudinal water-blocking structure.

PVC (Polyvinyl Chloride, PVC) resin is a thermoplastic polymer polymerized by vinyl chloride monomer (VCM). It is made of polyvinyl chloride resin as the main raw material, adding an appropriate amount of anti-aging agent, modifier, etc., through mixing, calendering, vacuum blister and other processes. PVC is an amorphous polymer containing microcrystals with a crystallinity of 5%-10% (melting point 175 degrees).

The physical energy of PVC, such as molecular weight, crystallinity, and softening point, varies with the polymerization reaction conditions (temperature). PVC resin plastic is made by plasticizing and molding with a variety of additives such as stabilizers, plasticizers, fillers, colorants and modifiers. PVC material has the characteristics of light weight, heat insulation, heat preservation, moisture-proof, flame retardant, and easy construction.

There are many specifications, colors, patterns, and they are highly decorative, and are widely used in production and life. For example, PVC water pipes, PVC plastic doors and windows, as well as plastic toys containing PVC, wires and cables. Due to its harm to the human body, Europe, Japan, South Korea and other countries have imposed restrictions on products using PVC as raw materials.

The outstanding advantages of general PVC resin plastic products are flame retardant, wear-resistant, chemical corrosion-resistant, low gas and water vapor, and good leakage. In addition, comprehensive mechanical energy, product transparency, electrical insulation, heat insulation, sound reduction, shock absorption, is the most superior universal material. The defect is that it is thermally stable and has poor impact resistance, and it is easy to produce brittleness during the use of both hard and soft PVC.

Generally, PVC contains bis(2-ethylhexyl) adipate (DEHA) plasticizer that is not allowed to be used by relevant national standards, and DEHA is easy to release at high temperatures (more than 100 degrees Celsius), which is harmful to health after contact with the human body. Because PVC is a hard plastic, to make it soft, a large amount of plasticizer must be added, and the plasticizer is easily released in a heated environment. If DEHA is used, it can interfere with the body's endocrine system, causing breast cancer in women, birth defects in newborns, decreased sperm count in men, and even mental illness.

Corrosion-resistant cable trays can choose stainless steel cable trays, hot-dip galvanized cable trays, aluminum alloy cable trays, etc.

1.Aluminum alloy bridge has high performance such as corrosion resistance, wear resistance, waterproof, etc., which directly replaces the performance of steel bridge and spray bridge, and the service life is more than 5 times that of steel bridge. The density of aluminum alloy sheet is low, and compared with steel material, the structural weight is reduced by more than 50%, and the installation is easy.

2.The hot-dip galvanized bridge is made of electro-galvanized bridge after high temperature processing, which plays a targeted role in anti-corrosion, and now the country's requirements for steel are becoming more and more stringent, so major projects are using hot-dip galvanized bridge, and the safety is greatly improved.

3.Stainless steel trough bridge is made of 304 stainless steel model material, the surface generally does not need to be treated, its performance and value is much higher than other materials bridge, after the development of stainless steel technology, 304 stainless steel contains Ni elements in its composition is extremely important, directly determines the corrosion resistance of 304 stainless steel and its value.

The above can be referred to.

The installation of 5mm iron pipe can effectively prevent external damage. If the budget is not enough, you can consider replacing it with porcelain pipes, and it is no problem to use national standard cables for corrosion or pollution problems, which itself meets the above conditions.

The cable is damaged by external machinery, vibrate, water ingress, corrosiveness, and must be remedied in time, and the water pressure injury on the periphery must be cleaned up.

Reinforcement around the cable, or overhead cable, or diversion laying, should avoid the above environment when erection, and at the same time should take the method of isolation.

You can put some adhesive tape on the cable, wrap it with waterproof tape, and then completely avoid damage and water ingress.

This problem can bury the cable inside the stainless steel pipe, and he will not have these problems.

It is necessary to set up a safety warning sign in the cable, there is a danger of electricity. It is strictly forbidden to enter the house. The water-soaked cable is hung up after a power outage. Stay safe.

If this is the case, the power must be cut off in time to ensure the safety of electricity. Otherwise, there may be a safety incident.

The cable should be buried through the pipe so that it is safe.

That may be to make up for the internship tonight.

1.Hot-dip galvanized. Zinc has outstanding corrosion resistance.

Galvanizing is used as a means of dedicating one's anode to the maintenance of the cathode metal. The longevity depends on its corrosion and corrosion rate, the resistance of the thickness of the zinc plating. The thickness of the zinc layer of hot-dip galvanized is usually more than 65um (455g m2).

The bonding surface of zinc and iron forms a layer of zinc-iron alloy, which improves the adhesion of the zinc layer. Foreign bridges have carried out atmospheric exposure experiments on hot-dip galvanized layers under various environmental conditions. Judging from the test results, hot-dip galvanizing can satisfy the request of the cable tray to use the life.

Due to the outstanding corrosion resistance and high function and ratio of hot-dip galvanizing, hot-dip galvanized steel bridges are widely used at home and abroad. About the thin walls of the module and the relatively large slenderness ratio. When hot-dip galvanizing is not easy to deform, it is necessary to think about the structure of the cable tray and the galvanizing skills.

Rust, forming a large area of coating blistering and peeling. Other coatings have poor UV resistance and are usually not suitable for field use.

2.Apply anti-rust paint. For larger-scale structural parts, due to the limitations of zinc pots, electroplating tanks, and ovens, they can usually only be treated with anti-rust paint.

Of course, this has the characteristics of low cost and easy use; However, the anti-corrosion ability is poor. The life span is short, and the maintenance workload is usually not suitable for use. The selection of aluminum alloy pallets, China has been used.

Regardless of the high humidity in coastal areas and the salt in the area containing sulfur dioxide gas. The raw material of the cable tray is aluminum alloy, and the experimental results of natural exposure show that the steel cable tray is corrosion-resistant in a significant winner. Especially in the use of anodized aluminum corrosion is very good.

3.Electrogalvanized. Tray electrogalvanizing and hot-dip galvanizing have relatively simple skills and low costs.

Regarding the construction of cable bridges without special requests. Electrogalvanizing can significantly improve its maintenance function after passivation. The electrogalvanized layer is usually around 12 zm.

Therefore, it is not suitable for applications with high requirements for corrosion resistance. The selection of the type of plating layer, the thickness of the coating, the strong adhesion of the coating, the corrosion resistance test, etc. are clearly defined, and the selection of different planning goals and content requests are different. In order to improve the corrosion resistance of galvanization, electroplating zinc-nickel alloy or high passivation treatment after galvanizing can be selected.

4.Electrostatic spraying. PVC materials are usually powder coatings, polyester powders or anti-corrosion powders.

Coating thickness 100 1rn approx. Electrostatic spraying is beautiful, chemically resistant and functional. However, compared with metal plating, the adhesion strength is lower, and the cleaning and wear resistance particles are poor.

1.Hot-dip galvanizing: This process is a very excellent process, which is in the state of zinc in liquid, after quite complex physical and chemical reactions, not only coated with a thicker pure zinc layer on the steel, but also generates a zinc-iron alloy layer.

Therefore, the cable tray treated by hot-dip galvanizing process can be used in a variety of strong acid, alkali mist and other strong corrosive environments, and has a long service life.

2.Fireproof paint: This process is treated with fireproof coating, which is a product that can protect the steel structure, which is made of polymer synthetic resin, flame retardant, foaming agent, carbonization agent and high-temperature refractory material.

In the high-temperature environment, the cable tray sprayed with this material can form a layer of foaming and expanding sponge-like thermal insulation layer on the surface of the cable tray, so that the cable tray can not be affected by high temperature and the strength can be reduced. It can better protect the cable line from damage.

3.Electrostatic spraying: This process is a method of spraying plastic powder on the surface of a cable tray.

Spraying process treatment on the surface of the cable tray can also increase the aesthetics of the cable tray, and the overall effect can be improved with the design sense of the construction project in the later installation project. It can strengthen the corrosion resistance, moisture resistance and anti-static effect of the cable tray itself, and can effectively increase the service life and aesthetics of the cable tray.

Polyurethane foam caulk does not corrode wires, because PVC is now generally used as the sheath material for wires and cables. It has good mechanical-physical properties, electrical properties and extrusion processing properties. Polyurethane foam caulk, on the other hand, does not cause any corrosion to PVC materials.

Polyurethane foam caulk is stored in the form of a single pressure tank with polyurethane prepolymer, blowing agent and injection agent as raw materials. Its main raw materials are: dimethyl ether, propane, butane, silicone oil, isocyanate, polyether, etc.

The main raw material of the prepolymer is isocyanate, and the main raw material of the blowing agent is dimethyl ether and propylbutane, and the ratio of dimethyl ether and propylbutane has a great influence on the blowing agent. Polyurethane foam caulk is accurately filled with 260 grams of combined polyether, 350 grams of isocyanate, propylbutane and dimethyl ether in a 750ml pressure-resistant tinplate can with an aerosol canning machine, and then shakes for 10 minutes, and is placed at room temperature for 24 hours to obtain the finished product.

Specific methods to extend the service life of cable tray: cable tray is a thin-walled steel structural part, in order to make it adapt to different environmental requirements and have a long service life, for chemical plants and other factories to use electricity, cable tray is corroded or rusted is more common, therefore, Changpeng bridge suggests to improve the anti-corrosion, anti-rust performance of the bridge is the direction of efforts to extend the service life of the tray. In this regard, the cable tray factory starts from the selection of materials and post-processing of the tray, and selects aluminum alloy, stainless steel, glass fiber reinforced plastic and other materials that are not easy to be corroded and rusted to make the tray, which effectively prolongs the service life of the cable tray.

On the other hand, cable tray manufacturers also apply electro-galvanized treatment process to post-process the steel tray to form a protective layer on the surface of the tray, and we can do a lot of work on the surface treatment process of the cable tray. Such as galvanizing process, the product is pickled, alkali washed, washed, passivated, galvanized, and then passivated, so that the inner layer and the surface of the galvanized layer form a high-quality passivation film, and its corrosion resistance can be increased by 5-8 times, especially the improvement of the hot-dip galvanizing process makes the surface quality of the hot-dip galvanized bridge meet the advanced standards of the United States, Canada and other countries, and its service life in coastal areas can exceed 40 years. It effectively prevents the corrosion of the bridge from humid environment and corrosive substances, and also prolongs the service life of the bridge.

Precautions for the maintenance of cable trays:

After the cable tray is used for a long time, the performance characteristics of all aspects will be reduced, so special attention and care are required in the later maintenance.

1.When the cable tray is maintained, it is necessary not to use a dirty rag to wipe it directly, and it is necessary to use a soft and clean rag to wipe the surface of the cable tray.

2.Do not use corrosive or other chemicals that come into contact with the cable tray, as this will cause the cable tray to be corroded and damaged.

3.The maintenance of the cable tray is best to be maintained about four times a year, generally once a quarter, so that the performance characteristics of the cable tray can be longer, and the service life is longer.

4.Other accessories of the cable tray also need to be maintained, and the cable tray or other accessories can be wiped with special polishing wax.