Characteristics of magnesium alloys: low density, high specific strength/stiffness, good electromagnetic shielding, good thermal conductivity, vibration damping, and machinability. Drawbacks include moderate corrosion resistance and limited high-temperature strength; laboratory applications primarily leverage their advantages in lightweighting and electromagnetic shielding.

1. Optical platform mounts, adjustment brackets, and lens barrel housings
   Optical laboratories: Magnesium alloys are used for optical adjustment mounts, adapter tubes, and support frameworks. Compared to steel, they offer significant weight reduction, lowering the load on the platform; their damping properties reduce vibration transmission and enhance optical path stability. They are frequently used in portable optical measurement equipment and housings for field-deployable spectroscopic instruments.

   Note: Magnesium alloys are generally not used for bases subject to heavy loads—where aluminum alloys are preferred—but are instead utilized for lightweight auxiliary brackets.

2. Precision instrument housings and chassis
   Mass spectrometers, spectrometers, portable detection equipment, and housings for small vacuum chambers. Magnesium alloys provide excellent electromagnetic shielding, blocking electromagnetic interference from circuits and protecting weak detection signals; they also conduct heat rapidly, aiding in the dissipation of heat from internal circuitry.
   Common examples: Handheld Raman spectrometers, portable XRF analyzers, and housings for field environmental monitoring instruments.

• Small vacuum fixtures and sample stage supports: Magnesium alloys have a relatively low outgassing rate, making them suitable for medium-to-low vacuum applications; they reduce weight and the load on vacuum motion mechanisms. Caution is advised in high-vacuum or highly corrosive environments due to the material's tendency to oxidize.
• Cryogenic device supports: Magnesium alloys possess moderate thermal conductivity, allowing them to serve as thermal-insulating support frameworks that minimize heat leakage via conduction; they are often used for the external support structures of small cryogenic sample stages.

1. Mechanical testing tooling and fixture frameworks
   Lightweight fixtures and counterweights for dynamic impact and fatigue testing machines. Their low density allows for rapid adjustment of counterweights, while their damping properties help suppress impact-induced vibrations.
2. Standard Magnesium Alloy Specimens
   Magnesium alloy sheets and rods developed in-house by the materials laboratory are used to fabricate tensile, impact, and corrosion specimens for research into material properties (alloying, heat treatment, surface modification, and corrosion mechanisms).

Electromagnetic shielding boxes, shielding cavities, and antenna mounts. Magnesium alloys offer high electromagnetic shielding effectiveness, making them ideal for RF and EMC testing; they are significantly lighter than steel shielding boxes, facilitating easy handling.

Mechanical arm linkages, mobile robot chassis, and motion stage brackets. Lightweight properties reduce motor load and improve motion response speed; vibration-damping characteristics minimize vibrations during high-speed movement, making them suitable for research prototypes.

• Aerospace Research Laboratories: Magnesium-lithium alloys (ultra-lightweight magnesium alloys) used for aircraft models and satellite prototype structural components in scaled-down wind tunnel tests.
• Biological Laboratories: Used only as equipment housings rather than in direct contact with biological samples; magnesium is not inherently resistant to corrosion by body fluids and is generally not used for implant test specimens (medical magnesium alloys constitute a separate field of study focused on biodegradable implants).

1. Poor Corrosion Resistance: Susceptible to corrosion in humid, acidic, or alkaline environments; surface protection (conversion coatings, anodizing, or spraying) is mandatory. Direct contact with saltwater or acidic liquids must be avoided.
2. Poor Heat Resistance: Strength decreases during prolonged exposure to temperatures above 120°C; unsuitable for components inside high-temperature furnaces.
3. Susceptibility to Scratching: Relatively low hardness; precision mating surfaces require protective coatings.
4. Machining Precautions: Magnesium chips are flammable; cutting temperatures must be controlled, and fire safety measures implemented during the machining of specimens.