Applying a liquid coating to metal surfaces is common these days. But, here is the most typical question. Which one is better between powder and anodized coating? Do these processes produce air pollution or hazardous waste?
Well, each coating process has its advantages and drawbacks. One method gives a matt and polished finish, while another provides better wear and tear resistance.
This article explains the primary differences between these two coating systems.
What Is the Meaning of Anodized Coating?
So, what is aluminum anodizing? Well, it is a relatively straightforward electrochemical process. It involves dipping aluminum, alloys, or non-ferrous metals into an electrolytic bath.
It has electrically charged liquid coatings through a cathode. So, it acts like paint on the metal surface.
The aluminum becomes the anode (anodic coating.) It reacts with charged particles to form aluminum oxide.
Then, the oxide combines with the metallic surface. It means the paint integrates with the base material.
Thus, the result is a layer that hardly chips like the regular paint. Most people prefer this process because of its neat application. It also boasts substantial benefits.
Some applications need this process for endurance. Likewise, others will work best with a powder coating.
For instance, you can use it on fishing reels for seas and saltwater areas. This process makes it salt resistant. The reels are more effective for fishing in this area and durable.
What Are the Main Features of the Anodized Coating Process?
Check out the features of this process below. These will help you make a proper comparison.
1) It Is Corrosion and Damage Resistance.
Paint integrates with metal in this process. It is to improve the rust and corrosion-resistance abilities.
Moreover, it slows downs the damage process. That makes it better for the agriculture, fishing, and industrial sectors.
Anodized coatings work well. Even so, there are high risks of debris chipping coatings. But, the method has a lower chemical-resistance level.
2) It Ensures Longevity.
The coating method forms an unbreakable bond between the metal and paint. You can choose different colors and have them for a long time.
Also, anodized metals are more durable. Most will endure more brutality but remain intact.
3) You Get Total Coverage.
Dipping the metal in the bath gives it a consistent surface. You don’t need to worry about curves unless intended.
Moreover, there are no missing nooks and crannies. All metallic surfaces have even coverage.
But, tooling marks or flaws in the original product remain visible even after an anodized finish. You need an extra sealing step if you opt for color dyeing or other coating types. It could be hot, cold, or a combination process.
4) It Is a Reusable Process.
You can use the electrolyte bath for many coatings. It is a way of embracing natural longevity.
Moreover, it prevents volatile organic compounds. So, there is no release of poisonous waste into the air. In short, it is safe for workers and the environment.
What Are the Drawbacks of Anodized Coating?
Even with its many advantages, this process also has a flip side. Read them below:
1) This Process Is More Costly.
Spray painting is cheaper than anodizing. The bath is expensive, and so is the end product.
The prices of composite, die-cast, and anodized reels vary. The first two are cheaper processes.
The high cost of the anodization process makes the prices of the end products high. Since other reels use powder coatings, they are cheaper.
2) It Gives a Low Choice of Colors.
You can apply many colors in this process. But, it is not very flexible like powder. Check out this guide to create a matching anodize color.
3) Initial Marks are More Visible.
The consistency of this process is uniform. But marks on the original metal will remain visible.
When it comes to the look, the polished finish is admirable. This process gives a rich look to the anodized aluminum.
What Is the Meaning of the Powder Coating Process?
Powder coating a base metal uses a dry powder. We need to spray it on a grounded part.
Substrates can withstand the temperatures needed for the curing procedure. Thus, it promotes adhesion.
The curing process involves the powder flowing and becoming a paint. You can ground the substrate electrically in this process.
What’s more, the powder coating material is popular since it is cheaper. Besides, you can apply it on different surfaces to have a smooth coating.
What Are the Main Features of the Powder Coating Process?
Why is the powder coating method a better option? Well, you can check its features below.
1) It Is Suitable for Many Applications.
Powder coating works on heavy metals if they can withstand the curing temperatures. Thus, it is best for a section that can’t have aluminum.
For instance, parts need a steel base for resilience and hardness.
2) It Offers Uniform Results.
Powder sprays cover any flaws on the metal’s surface. They could be weld joints or grind marks. It is the best option for some applications. The final results of the sections are more uniform.
Moreover, this process avoids any color variation. That’s because the color remains constant.
In short, it accurately matches original colours and gives a richer metallic appearance.
3) It Is a Cheaper Process.
The powder coating method is cheaper for most applications. It is affordable and durable for large-scale coverage. Even more, it gives a translucent metallic appearance.
What Are the Drawbacks of Powder Coating?
Let’s check out powder coating concerns and compare them with anodizing. It will help you find the best method for your application.
1) Chipping Issues with Powder Coatings.
The powder coating doesn’t integrate with the surface. The chances of chipping are higher in this process. So, it may not be an option for heavy-duty industries.
2) Powder Coating Material Is Vulnerable to Sunlight.
It is susceptible to prolonged exposure to UV light. But it is more resistant than regular paint solutions.
What Are the Differences Between Anodizing and Powder Coating Processes?
Now you have a basic idea of anodizing and powder processing. You need to know how to separate these processes apart.
Thus, the section below discusses six factors that tell the two apart.
1. The Main Process.
Anodizing involves an electrochemical process. It improves the density of the aluminum’s natural oxide layer.
Thus, it increases the metal’s endurance. The thicker the coating of the aluminum, the longer its lifespan.
Likewise, powder coating is a more specific process. You apply a protective and decorative finish to any metal. The primary material is an electrostatically-charged powder you spray on the metal.
2. Color Choices.
You can do anodizing in different batches. That is why there can be a color variation on your substrate.
For powder coating, the powder remains constant. Thus, it avoids any instances of color variation on a substrate.
You can choose powder coatings to achieve better colour uniformity on any part of the metal.
3. Pricing
Powder coating is cheaper for both small and large-scale use. It becomes costlier when used on a small scale.
But it is more affordable for mass production.
4. Type of Surfaces.
Anodizing is best for aluminum and aluminum alloys. Powder coating has more uses.
So, you can apply it on almost any surface. It could be aluminum, wood, or steel. The results are gloss finishes and uniform regardless of the material.
5. Rework
Anodizing is permanent. If you make a mistake, you cannot change it once oxidation happens.
But powder coating is more flexible. You can repair, dent or re-coat it.
It means that anodizing needs a more skilled person. You want to lessen the chances of making errors. As a result, it saves you from incurring losses and wasting time and material.
Even beginners can experiment with powder coating. You can repair the surface or re-coat it with more paint in case of a mistake.
6. Layer Longevity.
Anodized surfaces last longer than powder-coated surfaces. They are permanent and corrosion-resistant. Thus, the chances of damage are lower.
Anodised finishes can handle more brutality while remaining intact.
Thus, industries go for anodizing for heavy-duty applications. Its endurance and performance are higher.
Powder coating surfaces are prone to wear and tear. Thus, the slightest impact can cause damage.
Moreover, powder coating poses a higher risk of damage by UV lights. Rain can cause the lifting of paint, while sunlight leads to oxidation.
But, the layer is somewhat more resilient than regular paints. So be careful when exposing powder-coated surfaces outside.
Anodised vs. Powder Coated Process – Which Should You Choose?
The type of aluminum finish depends on the surface. Powder coating and anodizing are suitable for aluminum surface treatments.
But anodizing is the best process if you want tighter dimensional margins.
It is for users who want to achieve longevity and durability. Go for anodizing if you wish for wear and corrosion resistance.
Moreover, it also gives a flawless look. Sometimes, it is the only option when powder coating fails.
Even so, the aluminum surface would need heat dissipation. Thus, it would be best to subject it to a primer or glue application.
You should choose powder coating if you want unique textured finishes or vibrant colors. These last longer if you expose them to internal elements.
Also, be extra careful if you take powder-coated surfaces outside. Exposure to moisture and sunlight reduces their lifespan.
But, if you want a low-cost option, powder coating is the one to choose. It offers good protection with proper care.
Check out the huge range of surface finishing services at AT-machining.
Final Thoughts!
Powder coating and anodizing both have their ideal applications. For instance, heavy-duty applications in industries need anodizing. Powder coating comes in handy if you are working on a tight budget.
If you are looking for perfect consistency, go for an anodic oxide finish. But, if your product has marks, they will be visible after this process. Powder coating wins if you want an option that gives many applications.
So, it is easier to decide between anodization vs. powder-coated surfaces. Use this guide to know the best surface treatment for your aluminum products.
You can also reach our coating experts for more help. They can help you choose the best coating process for decorative and protective finishes. So, use our contact us page to knock on the door!
