Different projects, architectural designs, and buildings have different material requirements. The material you choose can also significantly impact the longevity, aesthetics, and overall performance of your structure. Two options that often stand out and provide extra protection are powder coated aluminum and coil-coated aluminum, but what’s the difference? Both offer excellent protection and aesthetic appeal, so understanding their differences is crucial for making informed decisions in various applications.
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Powder coating is a popular finishing technique known for its durability, versatility, and environmental friendliness. It involves the application of a dry powder to a substrate, which is then heated to form a smooth, uniform, and durable finish. Aluminum, being inherently resistant to corrosion and lightweight, serves as an ideal substrate for powder coating. This product also comes pre-painted or finished, after the powder coat has been applied. This eliminates the need for a painting team to finish the job. Powder coated aluminum is:
Powder coated aluminum is used in many different applications, even beyond the architectural realm:
Coil-coated aluminum, also known as pre-painted steel, involves the application of organic coatings to steel coils before they are formed into finished products. This process enhances the steel’s corrosion resistance and aesthetic appeal, making it a preferred choice in many industries. Liquid coatings are most commonly used in this process, alkyd resins, solution vinyl resins, and, to a certain extent, epoxy resins are used. Coil coating, is an efficient method for uniformly applying high-quality coatings onto metal surfaces and provides:
Coil-coated aluminum has a wide range of uses across multiple industries:
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Aluminum is an incredibly abundant metal, found in the earth’s crust and making up around 8% of its composition. Because of this abundance, it is used widely across a variety of industries and applications. The hot dipping process used to produce aluminum coating is far more efficient than other methods, resulting in greater production output at a lower cost. This makes aluminum coating one of the most affordable options among similar materials. Additionally, the process involves no hazardous waste materials or by-products that may need to be disposed of afterwards, further contributing to its economic value. Furthermore, aluminum has strong resistance to oxidation and corrosion which leads to a much longer service life when compared with other coatings. This means it requires fewer maintenance costs over its lifetime as well as less replacements or repairs over time; all contributing factors to keeping costs low for end users.
Aluminum is a particularly abundant metal and widely used, making it available at an economic price, which is often lower than other similar options. The hot dipping process involved in aluminum coating is also more efficient and cost effective than other methods. This means that the production of aluminum coatings can be achieved with fewer resources and less labour, resulting in reduced overall costs. Additionally, many Coil Coating operations are automated and can run around the clock without the need for direct human supervision or maintenance, which further reduces costs while providing consistent quality results. In addition to the lower production costs mentioned above, using aluminum coatings often results in lower maintenance costs over time due to its strong corrosion resistance properties. Aluminum coatings do not require frequent reapplication or touch-ups like traditional paint systems as its protective properties remain intact even after years of exposure to harsh environmental conditions such as ultraviolet radiation and salt water spray. This makes it an ideal choice for businesses looking to reduce their long-term operational costs.
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Price: Compared to processes that deliver similar results, aluminizing is more cost-effective in practice.
High yield strength: Aluminum is one of the most ductile metals on earth. It affects yield strength positively.
Variety of application: Aluminum coatings can be applied to mild steels, low alloy steels and high carbon steels.
Oxidation resistance: The aluminum coating forms two layers that protect the steel core. On the very surface, a thin aluminum oxide layer is formed. Underneath, the aluminum is mixed with steel and silicon, which is added in the aluminizing process in small quantities. Below that, there is the steel core, which retains its original yield strength and other material properties. The aluminum coating prevents the steel from reacting with the oxygen and other harmful elements and acts as a barrier and protector.
Sulfidation resistance: The coating does not only protect the steel core from oxidation but also from H2S, SO2 and SO3 attacks.
While aluminum coatings offer many benefits in the way of chemical attacks, they are not the right choice in terms of surface hardening. Aluminum is one of the softest metals that exist and is therefore not fit for applications that are put under a lot of stress. If you are looking for a treatment that improves surface hardness, boronizing is a better choice for you. At BorTec, we make use of our own patinized boronizing treatment that can not only increase hardness up to HV but also displays great wear resistance and resistance against acid chemicals. While aluminizing is a good choice for applications that require good resistance against acids, boronizing is more of an allround answer because we can improve other mechanical properties as well. Read more about boronizing here.
The thermochemical diffusion process starts by heating aluminum in a furnace along with the workpiece, forming an oxide layer at the surface once it cools. This acts as a barrier against acids and other chemicals.
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Aluminum coatings can be applied through various methods. The most common is hot dipping, a galvanic coating that uses high temperature baths to create protective coatings. The steel workpiece must be cleaned before hot dipping to ensure that the aluminum atoms will adhere to the surface of the material. The material is then submerged into a bath made of aluminum and silicone (11%) at temperatures between 700 and 750 °C. The silicone is added to stretch the aluminum layer even thinner. Once the workpiece is air dried, the aluminum will already be diffused into the surface of the steel work piece.
Aluminum coatings can be applied to a wide range of areas. The most common are found in applications that have to withstand high heat, humidity and chemical attacks. Therefore, aluminum coatings can be found in boiler parts, chimneys, ducts, plants, and tubes and pipes. Generally, aluminizing is applied when decent corrosion resistance is needed.
If you’re not sure whether aluminum coating meets your demands, you can contact us here. We offer a specialized and patented boriding treatment that significantly improves hardness, corrosion resistance and thermal stability for numerous steel types. We would love to advise you on the best hardening treatment for your metal workpieces.
As opposite to light absorbing coatings in many parts there are areas with highly reflective surface, like mirrors or semi mirrors. One of the popular reflective coatings is aluminum.
Outside surface: aluminum coating, internal surface: Acktar Fractal BlackTM coating
Aluminized coating is a surface treatment that can be applied to different base metals but is typically used together with steel. Applying this coating combines the benefits of both of these popular and ideal manufacturing materials. The result is a compound material with the advantages of aluminum’s corrosion resistance while maintaining the strength of the steel. Although aluminized steel is relatively new to the industry, it has become extremely popular because of its many advantages and is ideal for situations when high temperatures are involved.
One of the most common ways that aluminizing is applied is in a process called hot dipping which is effective, and creates a strong bond between the materials. Hot dipping requires the base metal to be cleaned and then it is submerged in a very hot bath to create the coating. When heated, the vapors form a thin aluminum oxide layer at the surface, which creates a barrier protecting against future oxidation.
There are two types of aluminized steel. Type 1 is hot-dip coated with a combination of aluminum and a silicon alloy. The steel is submerged in a high temperature composition containing 5-11% silicon alloy. This type of coating is used mostly in situations when high temperatures are involved with the need for corrosion resistance. Type 2 is hot-dip coated with pure aluminum and used in situations that require atmospheric corrosion resistance.
Corrosion resistance: aluminizing has a self-protecting characteristic to oxidation. This means it has a high resistance to corrosion and typically won’t rust unless it’s damaged. It can withstand many atmospheric conditions that other metals cannot. Aluminizing steel gives the final product these characteristics. In addition to oxidation resistance, aluminizing also has sulfidation resistance and carburization resistance. It provides chemical protection against hydrogen sulfide (H2S) and sulfur oxides (SO2, SO3). Aluminized steel is more corrosion resistant than carbon steel and even aluminum on it’s own. This is a benefit of the hot dipping process used to form the coating, which protects the base metal.
High temperature resistance: aluminum coating is highly reflective and bounces away about 80 percent of visible light in addition to about 90 percent of radiant heat that comes into contact with its surface. It can protect the base material for temperatures up to 800 degrees Celsius (1,470 Fahrenheit), which is much more compared to galvanized steel that has a recommended maximum temperature of about 200 degrees Celsius (392 degrees Fahrenheit). It also is less likely to deform under heat stress than some other materials such as stainless steel.
Lower cost: aluminum is a particularly abundant metal and widely used. The hot dipping process is also more efficient and cost effective than other methods to produce. This makes it available at an economic price, which means its cost is lower than other similar options.
Good formability: because aluminum can be fabricated into any form, aluminized steel can be bent, folded, corrugated, and rolled without it breaking. It’s high yield strength means that it’s unlikely to deform when shaped and has many versatile applications.
Heating appliances: because aluminized steel has a resistance to high temperatures, it’s ideal to be used in ovens, heaters, kitchen ranges, boilers, incinerators, and barbeque burners.
Cooking ware: aluminum coating being resistant to corrosion means it doesn’t rust. This naturally makes it a sanitary option to be used for pots and baking pans – which indeed need to withstand high temperatures. Aluminizing steel also transfers heat faster so it’s a good choice for anything that requires heating materials. It’s important to note that aluminum coating doesn’t affect the flavor of food.
Automotive: aluminized steel is a preferred manufacturing material in car and motorcycle exhaust systems. It can also be used for aerospace components.
Industrial applications and construction: resistance to corrosion makes aluminum coating especially beneficial to be used in HVAC components and pipes that transport corrosive substances. Its heat resistant properties also mean that aluminizing is a good choice for use in chimneys. Aluminized coating is a beneficial choice for use in refineries and gas plants. Pure aluminum coating can be found in corrugated roofing and siding, which need to be resistant to atmospheric corrosion
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