Protection of Electrical and Electronic Equipment

Iron and mild steel used in electrical and electronic equipment is normally coated with cadmium, nickel, or tin, except in the following circumstances  

Aluminum and its alloys should be anodized and painted, except in areas of electrical bonding. In such areas and where anodizing is not possible, a ehemical film treatment may be used, although it does not afford corrosion protection equivalent to anodizing. When possible, chemical films should be given the additional protection of organic coatings. 

For those applications where aluminum or its alloys are involved in continuous exposure to elevated temperatures, where the resulting oxide build-up would be objectionable (e.g. heat sinks), metallic coatings with suitable thermal characteristics should be considered in place of anodizing. 

Copper and copper alloys may be given a black oxide treatment, plated, or painted. 

Magnesium, when its use is essential, should be protected as follows  

---

Unless this concentration of gas is maintained for an extended period, CO2 does not normally extinguish fires in materials that smolder or produce glowing embers, such as paper and wood. Its greatest effectiveness is on flammable liquid fires that do not involve material that might reignite after the CO2 has dissipated. It is especially suitable for use in laboratories and in the protection of electrical and electronic equipment. 

---