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At present, there are quite a number of lead compounds used in chemical industry. Only a few widely used products are described here. Lead oxide is widely used in paste mixtures of lead-acid battery grid, cement, glass and ceramics, and can be used to prepare other lead compounds. Red lead is an important anti-rust coating, used as primer and inner paint layer to prevent steel rust.

The most important white anti-corrosion pigments in industry are lead carbonate, lead phosphite, lead phosphite and lead silicate. Lead borate can be used in glass manufacturing, fire retardant coatings, paint drying agents; Lead nitrate is used in pharmaceuticals and ore flotation. In addition, lead chemical products are also used as light-emitting materials in electronic powder materials and color electronic ultra-black picture tubes.

solder

Lead alloy solder is usually referred to as soft brazing solder, of which lead-tin alloy solder is the most widely used in all welding materials and has a long history of use. It has a low melting point and can be ideally connected to most metals by a simple heating method without damaging the heat-sensitive element.

The application of traditional alloy solder should particularly attract the attention of the user: alloys with different tin content should be used for specific welding objects and requirements. To achieve the purpose of saving expensive tin and reducing cost under the premise of meeting the requirements of use. For example, solder with a tin content of not less than 5% is mainly used for sealing, commonly used to seal the container after pre-surfacing, coating and welding metal, and can also be used for service temperatures exceeding 120 ° C.