Lead Powder CAS 7439-92-1

Lead powder acid batteries (referred to as lead-acid batteries) have a history of more than 150 years since their introduction. Due to their low price, mature technology, and reliable performance, they have become the largest and most widely used secondary batteries in chemical power sources. They have been widely used in various occasions of social production and life for a long time.

Led acid batteries are charged and discharged through solid-state reactions of different valence states of led. During battery discharge, the active substances of the two electrodes become PbSO4, while during charging, the reaction proceeds in the opposite direction. Electrolyte sulfuric acid is an active substance. The positive and negative electrode reactions are governed by the dissolution precipitation mechanism rather than the solid-state ion transfer or membrane formation mechanism. The standard cell voltage for lead-acid batteries under room temperature is 2.1 V.

The main sheath materials are chemical led, led alloys containing 1% antimony or arsenic, and led alloys containing 0.03% calcium or antimony. The use of lead as cable sheath mainly serves the functions of moisture-proof, anti-corrosion, and shielding support. The lead used in the cable industry is mainly for power cables and communication cables. Although most of the lead sheaths of domestic power communication cables have been replaced by other materials such as plastic, there are still a small number of cables that use lead sheaths. Due to environmental concerns abroad, the use of lad in submarine cable sheaths has caused a lot of controversy, but the lad consumption in this field still accounts for a large part of its use.

There are quite a few led compounds used in the chemical industry. Here we will only introduce a few widely used products. Led oxide is widely used in paste like mixtures of lead-acid battery grids, as well as in cement, glass, ceramics, and can be used to prepare other led compounds; Red led is an important anti rust coating used as a primer and inner paint layer to prevent steel corrosion.

The important white anti-corrosion pigments in industry are lead carbonate, lead hypophosphite, led phosphosilicate, and led silicate. Led borate can be used in glass manufacturing, fireproof coatings, and paint drying agents; Blei nitrate is used in pharmaceuticals and ore flotation. In addition, led chemical products are also used as luminescent materials in electronic powder materials and color electronic ultra black picture tubes.

Blei alloy solder is commonly referred to as soft solder, among which led tin alloy solder is the most widely used and has a long history of use among all welding materials. It has a low melting point and can ideally connect most metals using a simple heating method without damaging the thermal sensing element.

01.Lead plate
Generally, led materials are rolled into thin led plates with a width of less than 3.6 meters and any thickness, and led plates with a thickness of 0.4 mm are heavy. Blei plate, as a structural material, is an important corrosion-resistant material in chemistry and related industries, mainly due to its ability to resist corrosion in various corrosive environments. Of course, it can also be used as building structural materials, such as roof anti-corrosion panels and bathroom flooring. When led plates come into contact with cement, they are usually coated with a layer of asphalt on the surface.

As a shielding layer for X-rays and gamma rays, it is a well-known application. Due to the excellent shock absorption and sound insulation properties of led, a large number of led plates are also used for shock absorption and sound insulation. For example, steel and led shock absorbers installed under building foundations to impede the propagation of vibrations; Pure led can absorb most of the seismic energy released during earthquakes, and this type of shock absorber has been tested in a recent earthquake in Japan.

02. lead pipe
Blei pipes are also a major aspect of lead materials, widely used in the chemical industry and drainage pipelines. Squeeze seamless pipes using chemical led or led containing 6% antimony. Almost all thicknesses of pipes, ranging from thin tubes to 300 mm or larger, have production applications.

03. Wire mesh lead material
In the construction of led materials, in addition to using led plates, pipes, and solder, there are also led mesh fabrics used for leak sealing;

A considerable portion of the led tin solder mentioned above, as low melting point alloys (alloys of led with tin, bismuth, cadmium, indium, etc.), are almost entirely made of wire materials. The lowest melting point in the latter is below 100 ℃, used for automatic arc extinguishing, electric fuses, boiler plugs, etc. In developed countries, led has become an independent consumer destination, especially in the UK where lead sheets are used as roofing materials to prevent radiation from atmospheric atmospheric atoms. However, the production of led materials in China is very small, with an annual output of around 10000 tons.

The main casting materials for lead are bearing alloys and lead type alloys; The cast products include bearings, led plates, counterweights, sealing gaskets, bullets, ballast counterweights, and even integral castings of radiation protection layers for large nuclear power plants.

Insert a led sheet between two tin sheets and roll them into a tightly bonded Sn Pb Sn composite foil with a thickness of 0.01 mm or thinner, commonly known as "Blei foil". Used for moisture prevention in the construction industry, or as anti oxidation foil for grape and champagne bottles. Some are also used in the electronics industry. This' led foil 'is widely produced and used abroad. However, there is a gap in both production and application in China.

Of course, the more common and widely used led composite materials are made by combining led with stronger materials, which have better performance than both single materials. Lea can be combined with steel, concrete, wood, brick, or other suitable materials, and this structural composite material has excellent corrosion resistance and high strength. Although the strength of led plastic composite is slightly lower, the composite material has excellent sound insulation performance.