Cadmium, a naturally-occurring element, is one of several metallic coating materials which are electrochemically active and, therefore, used as sacrificial coatings to prevent corrosion. Typically they are applied to iron, steel, zinc, aluminum, and titanium alloys, as well.
Cadmium coatings are used on hardware that must be subjected to harsh environments, especially where good corrosion resistance to marine or salt-laden atmospheres is required. Cadmium coatings are often employed in shipbuilding applications because of their high resistance to sea salt, and also in railroad, and ordnance applications. In addition, cadmium coatings have good corrosion fatigue properties as well as resistance to stress corrosion cracking, making them valuable in protecting high strength steel fasteners utilized in the aircraft industry.Read More