Hefei introduce recycling of lead alloysLead alloy, lead-based alloy composed of other elements.
, in terms of performance and use of alloy corrosion resistance alloys, lead alloys can be divided into batteries, solder alloy, alloy, alloy and alloy mold, such as printing. Corrosion protection of lead alloys are mainly used for chemical, radiation protection, production of the panels and cable kit.
lead alloy surface corrosion in the process of oxides, sulfides, or other complex salt compound coating, prevents oxidation, sulfide, solvent or volatile functions, so in the air, sulfuric acid, freshwater and seawater has a good resistance to corrosion. Lead alloy containing no solid solution to lead or to form the second phase of bismuth zinc, magnesium, and other impurities, the corrosion resistance is reduced; adding tellurium, selenium and bismuth eliminates impurities on corrosion resistance of harmful effects. Added to the lead alloy containing bismuth antimony and tellurium, refined grains, increasing strength, inhibit the harmful effect of BI to improve corrosion resistance.
-lead alloy of low melting point (in 327 below), good fluidity, solidification shrinkage, melting less, to melt composition of small, casting complex shapes, sharp devices, widely used in Foundry type and model, and so on. Lead-antimony alloy used in the printing industry for more than 500 years of history. Modelling and photogravure using lead-free alloy, containing antimony, increases hardness and strength, reduce the rate of shrinkage in the solidification process; the Tin role in improving liquidity and sharpness. Use of low melting point alloy for modeling materials, the production process is simple, and there is a certain life, changes to the product and model refurbished very convenient.
lead alloy deformation resistance of small ingots without heating can be made by rolling and extrusion process plates, strips, pipes, rods and wire, without intermediate annealing. Lead alloys the tensile strength of 3~7kgf/mm2, much lower than most other metal alloys. Antimony is used to strengthen one of the most important elements in the matrix, only part of the solution for the lead, both for solid solution strengthening, and age-hardening; but if the content is too high, making lead alloy's toughness and corrosion resistance of the worse. Performance considerations, lead alloys for the production of chemical equipment and pipeline corrosion, such as artifacts, containing antimony 6% about; when used to make a connection component, containing antimony 8%~10% as well. Adding a small amount of lead-antimony alloy copper, arsenic, silver, tellurium and calcium can increase strength, called hard lead.
due to low shear and creep strength of lead alloys, under certain loading and rolling shear, deformation and thinner foils of lead alloys are easy to like; and lead run, running and good shock absorption, noise, which is a good bearing alloys. Lead-based bearing alloys and Tin-base bearing alloy called Babbitt, can produce high loads of locomotive bearings. Arsenic up to 2.5%~3% lead-free alloy, suitable for high load, high speed, temperature-resistant heavy machinery bearings.
lead alloys has not been characteristic of x-and gamma-ray penetration, can be used for protection from radioactive materials.
lead fumes toxic, must have good protective measures when casting.