Arsenic lead alloy

Arsenic lead alloys are primarily used to enhance the mechanical properties of lead, particularly its strength and resistance to bending and creep

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Introduction

Arsenic is chemically very similar to phosphorus, and it rapidly oxidizes to arsenic oxide when heated. It is usually added to lead along with tin, tellurium, silver or bismuth to provide resistance to bending and creep.
Lead arsenic alloys acquire maximum hardness upon quenching. Subsequent storage of alloys at room temperature leads to softening as arsenic is precipitated.

Key Properties and Uses

*Consideration Toxicity,Both arsenic and lead are toxic metals

Increased Hardness and Strength

Arsenic additions make lead harder and more resistant to deformation, which is beneficial in applications like battery grids and ammunition

Reduced Creep

Creep is the tendency of a material to deform under stress over time. Arsenic helps to minimize this in lead-based alloys

Lead-Acid Batteries

Arsenic is a common component in lead-acid battery grids, where it helps to prevent shrinkage cracks during casting and improves resistance to corrosion

Ammunition

Small amounts of arsenic can improve the sphericity of lead shot, making it more accurate. 

Cable Sheathing

Arsenic is used in lead alloys for cable sheathing due to its strength and corrosion resistance

Other Applications

Arsenic is also used in combination with copper and other metals to enhance their properties, including corrosion resistance. 

Everything you need Know

Chemical Composition

The chemical composition of lead-arsenic alloy is outlined in the following table.

ElementContent (%)
Lead, Pb99.6
Arsenic, As0.15
Bismuth, Bi0.10
Tin, Sn0.10

Physical Properties

The following table shows the physical properties of lead-arsenic alloy

PropertiesMetricImperial
Density11.34 g/cm30.409 lb/in3

Mechanical Properties

The mechanical properties of lead-arsenic alloy are displayed in the following table.

PropertiesMetricImperial
Tensile strength17.2 MPa2490 psi
Modulus of elasticity14 GPa2030 ksi
Elongation at break40%40%

Thermal Properties

The thermal properties of lead-arsenic alloy are given in the following table

PropertiesMetricImperial
Thermal expansion co-efficient (@20-100°C/68-212°F)29.1 µm/m°C16.2 µin/in°F
Thermal conductivity33 W/mK229 BTU.in/hrft².°F

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