Which Type of Coating Will Best Protect Metal from Corrosion?

Galvinization

• Steel is an exceptionally strong material that often composes the supporting structure of buildings and bridges. Wind and rain eventually corrode the metal, and this threatens the integrity of steel structures. To prevent the corrosive effects of environmental exposure, steel is covered in a layer of zinc through a process called galvanization. Galvanized steel is dipped in a bath of molten zinc to create a layer of alloy along the exterior of the steel object. This protective layer prevents basic environmental damage and combats the effects of corrosive chemicals such as salt and chlorine.

Enamel

• Enamel is also applied as a protective coating for various metals. Enamel is a thin layer of fired glass melted directly on a metal surface. Enamel is not as tough as zinc alloy, but is ideal for metals used for cosmetic purposes, such as jewelry. Metal signs are also coated in a layer of enamel to provide corrosion protection without obscuring images or characters.

Paint and Ceramic

• Paint is one of the most common anti-corrosive coatings. Several layers of paint are applied to manufactured vehicles to inhibit rust and chemical damage. Paint is generally easier and cheaper than other types of coating, but is easily damaged by physical force. Layers of ceramic material can also be applied to metal to stop chemical corrosion. Ceramics don't react to chemicals like zinc and paint do, making them ideal for coating metals routinely exposed to corrosive chemicals.

Lubricants

• Coatings of lubricant are ideal for metal surfaces that experience large amounts of friction. Most machines, particularly engines, require regular applications of oil or grease to function properly. These slippery compounds prevent moving metal parts from gouging and scratching one another. They are also moisture-resistant, so they help prevent components and tools from rusting during prolonged periods of inactivity.