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Surface Spray Protection

Mar 10 '17

Surface Spray Protection

Metal surfaces and components need a protective coating for a number of reasons; to reduce wear on moving parts, protect them from the elements, repair damaged surfaces and more. Different thermal spray options are a relatively low cost way to get more life from your parts, so this blog will help show you how to maximise the value of your machinery.

What is Surface Spraying?

In a nutshell, a protective coating is achieved by heating powdered material and spraying it on to metal components – that’s why you might see the process called thermal spray or flame spraying. Depending on the spray method, the material can be anything from ceramic to dense metal alloys. Thermal spray protects metal components and reduces the wear from external influences like heat, abrasion, and chemical corrosion. However, not all spray techniques are the same; like any job, it’s important to understand the ins and outs of surface sprays to get the best result.

The Different Types of Surface Sprays

Like every tool of the trade, the right metal spray has no substitute. New Metal Surfaces however, has sprays to cover all your bases:

Combustion Powder Spray

Combustion Powder Spray process uses powdered materials as the coating feedstock, offering a wide range of coating options to reduce wear on machine parts. These can be metals and blends, ceramics, or polymers.

This technique allows for better spray gun manipulation, and powder coatings can be machined down to the ideal dimension. This technique is great for machinery rebuilds and salvaging, sliding wear and impact resistance, chemical resistance, and high temperature / atmospheric corrosion control on smaller moving parts.

Twin Wire Arc Spray

Twin wire arc spraying is the best choice for all-purpose spraying as coatings can be applied fast and at low cost. A wide variety of metal coating materials are available from aluminium through to tungsten carbide, offering high bond strengths, high deposition rate and minimal substrate heating.

Metal spray coatings are typically used to increase the life of parts by making them more resistant to wear, abrasion, or corrosion. It is also the perfect technique for restoring worn parts to their preferred dimensions at a lower cost than replacing the part.

High Velocity Oxygen Fuel (HVOF)

HVOF spray coatings are extremely dense and hard, making them ideal for pieces of heavy machinery that take a beating or need to be protected from the weather. A fuel source (usually hydrogen or kerosene), is mixed with oxygen and accelerated through a nozzle, using a powdered material like nickel or cobalt alloys, iron alloys, or carbides to create a super strong coating.

It’s important to choose the right coating for your parts. Although it might seem like the coatings do similar things, you will quickly notice the difference in wear rates using the correct thermal spray technique. For instance, HVOF coatings are ideal for large parts used in mining and construction but not for smaller moving parts like crank shafts – for that you need an arc spray treatment.

New Metal Surfaces are the experts in thermal spraying in Perth. To make sure you are getting the best advice and the highest quality materials every time, get in touch with us. The team would be happy to answer any questions you have about surface spraying.

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