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The extremely high level of precision needed within the aerospace industry makes CNC machining a suitable manufacturing process for the sector.
This article provides you with a complete guide to aerospace machining and its importance.
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If you want to produce high-quality machined parts with a sleek appearance, it’s essential to consider some critical factors related to CNC machining.
Here, we’ve gathered some basic information and important considerations to help you achieve the desired results.
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Exciting news from RapidDirect! We’ve rolled out two exciting updates to enhance your manufacturing journey.
Explore our Type II and Type III anodizing service and experience quality surface finish solutions to improve your metal parts' performance and appearance.
Anodizing is an electrochemical process that improves a metal’s corrosion and wear resistance and cosmetic appearance. It is primarily for aluminum and involves connecting the part to the anode before submerging it in a sulfuric or chromic acid bath.
When a metal electrode is attached to the cathode, and current passes through the circuit, the cathode attracts positive ions from the aluminum part. In contrast, the aluminum part attracts O2 ions from the solution.
The anodic part (aluminum) becomes porous due to the loss of cations and reacts with O2 ions. As a result, this forms the oxide layer on anodized parts. There are several anodizing types depending on the voltage and the electrolyte.
Type II anodizing’s electrolyte is sulfuric acid, producing parts with a thin anodizing thickness of 8-12μm, ensuring good corrosion resistance. Therefore, aluminum anodizing services recommend it for parts that need aesthetics and moderate protection.
Type III anodizing, or hard anodizing, produces a thicker oxide layer (35 to 50μm), offering higher wear and corrosion resistance. Furthermore, Type III anodic films are hard (70 Rockwell C). Hence, an anodizing service can recommend it for parts used in extreme conditions.
Type II anodizing produces metal parts with a thin oxide layer and moderate corrosion resistance. As a result, the quick turn anodizing process is ideal for parts requiring aesthetics and moderate protection.
Color | Glossiness | Visual Appearance | Thickness |
---|---|---|---|
Clear | Glossy | It yields a clear, glossy finish that enhances the metal's natural luster without significantly altering its color. | Range from 8-12μm |
Clear | Matte | It imparts a clear, matte finish to the metal, giving a subdued and uniform appearance without high reflectivity. | Range from 8-12μm |
Black | Glossy | It produces a deep, glossy black finish that adds an attractive and protective layer to the metal. | Range from 8-12μm |
Black | Matte | Provides a subdued, matte black finish for those seeking a non-reflective and uniform appearance. | Black |
Type III anodizing parts with a thicker oxide layer which offers higher wear and corrosion resistance and surface hardness
Color | Visual Appearance | Thickness |
---|---|---|
Clear | Introducing a non-conductive, thicker, and more wear-resistant oxide layer than standard anodizing. | Typical thickness range 35 - 50 μm |
Black | It produces a deep, consistent black finish that is both durable and visually appealing. | Typical thickness range 35 - 50 μm |
At RapidDirect, we offer a selection of standard colors for your projects. Should you require a specific RAL or Pantone color, do not hesitate to contact your sales engineer or us at [email protected] for personalized assistance.
Properties | Type II | Type III |
---|---|---|
Corrosion Resistance | Moderate | High |
Wear Resistance | Moderate | High |
Coating Thickness | 8-12μm | 35-50μm |
Appearance | Glossy and Matte finishes | More matte, highly durable |
Environment Friendly | Yes | Yes |
The anodized coating is highly durable, second only to diamond. It is also corrosion resistant, with Type III anodizing producing a higher hardness and corrosion resistance.
The durability is due to the thick oxide layer being highly resistant to harsh environmental factors such as sunlight, saltwater, and various chemicals. Overall, anodizing a workpiece will increase its lifespan and performance, ensuring it remains functional and aesthetically pleasing for extended periods.
Consider the aluminum alloys because they react differently to anodizing, which can affect the final part color and finish. The desired thickness will determine the level of protection, but thicker coating also requires longer processing times.
Since anodized parts can be dyed, color choices are very important. Furthermore, the desired final appearance, including matte or glossy finishes, will influence the pre-treatment methods with techniques such as sandblasting or chemical etching, affecting the overall quality and aesthetics of the anodized part
A common issue with anodizing is the presence of grooves due to the machining process, which can lead to more pronounced surface imperfection. There can also be inconsistent coloring due to alloy composition, thickness, or dyeing process variations. Lastly, uneven anodizing can result in exposed areas, and inadequate cleaning or improper pre-treatment can result in poor adhesion of the anodized layer
Yes, anodizing can cause color loss due to UV exposure and environmental factors. However, the time taken to lose color depends on the process, the quality of the sealing, and the die choice.
The cost of anodizing aluminum varies based on the part size, type of anodizing, color, and other specific requirements. For example, Type III is the costlier anodizing method due to the quality and characteristics of the final part. Contact us for a detailed quote tailored to your project needs.
Copyright © 2024 Shenzhen Rapid Direct Co., Ltd. All rights reserved
Copyright © 2023 Shenzhen Rapid Direct Co., Ltd. All rights reserved.