Metal spraying is a process of coating surfaces with metal or alloys using spray equipment. It is used to protect metals from corrosion and to harden softer metals. The process involves melting the metal and spraying it onto the surface. The equipment is portable, making it easy to use on complex surfaces. Metal spraying is versatile and can be used on various surfaces, including metal, glass, and concrete. It is also used in the arts to create metallic effects.
Metal spraying, or metallizing, is the process of coating a surface with metal or an alloy using spray equipment. It is used to protect metals from corrosion, using zinc or aluminum as the base spray materials. It is also used on corroded machine parts, tools and structural steel frames. It is also used to hard face a softer metal to give it greater wear protection. Typical coating materials used in metal spraying include cobalt, nickel with a small amount of chromium, and chromium manganese.
The process begins with the melting of the metal or alloy by means of a flame. The molten metal is then sprayed at high speed onto the surface to be coated using compressed air to propel the molten metal. Coating thickness will depend on the number of coatings applied. Common types of metal spraying process include flame, arc, and plasma.
In the flame spraying process, the spray material in the form of a wire is melted using a flame such as oxy-acetylene. An electric arc is used in the case of the arc spray process to melt a pair of metal wires or a conductor of electricity. It is also employed in the plasma spraying process to heat the material being sprayed, which is initially in powder form and rapidly heated through a plasma flame to be ready for spraying. The High Velocity Oxygen Fuel (HVOF) process uses oxygen and a fuel gas to create continuous combustion and ultimately produce a high pressure gas that is hot enough to heat and accelerate the velocity of the powdered material to its level of spraying.
The equipment used is portable, making the process a preference over other metal coating processes. The portability of the spray equipment allows you to be mobile and perform spraying work on various objects or surfaces that have complex shapes with ease, regardless of size. The extraction and replacement of faulty equipment on the job can also be done quickly due to its convenience. Production hours lost due to breakdowns can therefore be minimized.
Metal spraying is a versatile and effective coating process that can be applied to various surfaces including, but not limited to, metal, glass, and concrete. Its application is therefore varied in the various sectors. The arts also benefit from metal spraying when artists want to create a metallic effect on their masterpieces.
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