lead selenium alloy

The incorporation of selenium into lead alloys may enhance their mechanical characteristics and corrosion resistance. Lead selenium acts as a grain refiner for lead alloys producing smaller grain sizes which improves strength and ductility. Intermetallic compounds are also created with lead to improve the hardness and wear resistance of the alloy. It helps to decrease the effects of oxidation and sulphur-based corrosion on lead alloys thus facilitating long-lasting products in different uses.

At the moment, the market price of alloys containing lead and selenium varies according to the exact alloy mixture, amount requested and supply-demand balance in the world. Usually, these do command a premium above ordinary lead because of their additional performance qualities from selenium content. Common lead-selenium grades used for lead-acid batteries or radiations shields can cost about two thousand - four thousand dollars per metric ton. On the other hand, specialized high purity grades or individualized blends may sometimes go up to higher amounts in the market.

Directly affecting its price in the market is the selenium content of lead-selenium alloys. With an increase in percentages of selenium in an alloy composition, the price per unit weight will rise proportionally. This happens because selenium is relatively more expensive than leading as an alloying element. Moreover, higher selenium levels may also require advanced processing and control measures that are expensive during production hence adding to the overall cost. Consequently, lead alloys that contain little amounts of selenium are economically viable but those having above 5% would sell for a premium because of their improved qualities and complicated production processes.

Unlike other generally used lead based alloys for similar applications, lead-selenium alloy prices tend to be on the higher side. For instance, compared to the less expensive alloying elements in antimony and calcium, lead-antimony alloys and lead-calcium alloys are often cheaper options. However, it is justifiable that they charge higher prices because of their superior attributes such as enhanced mechanical strength and resistance against corrosion with­out compromising on its potential utility. The price gap may vary depending on global supply and demand situation of selenium as compared to other alloying metals. Nevertheless, it is a general truth that manufacturers often opt for these types of materials at a premium cost to enjoy some unique performance aspects.

Radiation shielding often employs lead-selenium alloys with a small percentage of selenium added to lead. The selenium content in these alloys usually ranges from 0.05% to 2% by weight, the most common compositions falling between 0.1% and 1%. The specific shielding requirements and desired material properties determine the exact composition. Its hardness and tensile strength are significantly improved by adding this element (SeI) into lead without losing good quality for radiation attenuation. Such types of all metals are often applied where they offer higher resistance and better protection against rays compared to pure Pb.