There are several types of aerospace metal finishing techniques, and each plays a pivotal role in producing high-performance components. In an industry where precision and durability are non-negotiable, these techniques ensure that every part meets the stringent requirements of aerospace standards.
Advanced surface finishing techniques go beyond aesthetics – they directly contribute to the reliability of aerospace systems. With the right material and technique, aerospace manufacturers can strike the perfect balance between the functionality and longevity of parts.
Understanding aerospace metal finishing techniques is key to choosing the right manufacturing partner.
Benefits of Aerospace Metal Finishing Techniques: What They Are and When to Use Them
Anodizing/Hard Coating
Anodizing, also known as hard coating, is an electrochemical process used to enhance the surface of aluminum components. By thickening the oxide layer on the metal, anodizing provides excellent corrosion resistance and surface hardness. This aerospace metal finishing technique even allows for custom dye coloring for aesthetic consistency.
This technique is useful for aluminum parts that face harsh environmental conditions, such as aircraft exteriors. The added durability ensures these components can withstand extreme weather, high humidity, and temperature fluctuations.
Plating (Including Tin, Silver, Gold, Nickel, and Cadmium)
Plating involves coating components with a thin layer of metal to enhance their properties. Common plating metals include tin, silver, gold, nickel, and cadmium, each offering unique benefits.
For example, gold plating enhances conductivity, making it ideal for electrical contacts, while cadmium and nickel plating provide excellent corrosion protection, perfect for fasteners and other critical components.
Black Oxide Coating
This aerospace metal finishing technique uses a chemical process to apply a layer of black iron oxide on steel surfaces. It offers mild corrosion resistance, reduces glare, and improves lubricity so that components can move smoothly.
Manufacturers apply this technique where aesthetics, minimal corrosion resistance, and functional improvements are the main priorities. It is particularly useful for tools, non-critical steel components, and parts where surface appearance and reducing friction are essential, but extreme corrosion protection is not a primary concern.
Passivation
Passivation is a chemical treatment process designed to remove contaminants and prevent oxidation in stainless steel. By treating the material, passivation enhances natural corrosion resistance without changing the surface appearance.
This aerospace metal finishing technique is ideal for stainless steel components that function in high-moisture environments and are vulnerable to rust. At MME, we specialize in providing in-house passivation services – we guarantee all treated components meet the highest quality and performance standards.
Chemfilm (Chromate Conversion Coating)
Chemfilm, or chromate conversion coating, adds a protective layer to aluminum surfaces. It provides excellent corrosion resistance and improves the adhesion and durability of secondary processes.
Aerospace manufacturers primarily use Chemfilm for conductive aluminum components that require protection while maintaining function, like housings and connectors. At MME, we specialize in NADCAP-certified Chemfilm (Iridite) treatments for aluminum, which we perform in-house.
Quality Control and Compliance Considerations
Quality control of aerospace metal finishing techniques is critical. Non-destructive testing (NDT) methods, such as ultrasonic testing or X-ray inspection, are often employed to detect defects without compromising the integrity of the parts. These tests help confirm that the finishes are free from cracks, voids, or other imperfections that could affect performance.
Post-finishing inspections are also essential. Manufacturers specializing in aerospace metal finishing check coating thickness, adhesion strength, and overall performance. During these inspections, manufacturers also ensure the coating meets industry regulations for safety and durability.
Common Challenges in Aerospace Finishing
Aerospace metal finishing comes with several challenges due to the extreme environments these components must endure. One of the main concerns is preventing oxidation and corrosion, which can compromise the integrity of parts exposed to harsh conditions like high humidity, saltwater, or fluctuating temperatures.
Achieving uniform coverage on complex geometries is another challenge. Irregular shapes can make it difficult to apply coatings evenly, leading to areas of weakness or inadequate protection. Additionally, there is the need to balance performance with compliance – this requires careful attention to both the technical aspects of finishing and the industry’s regulatory requirements.
MME: An Expert in Aerospace Metal Finishing Techniques
Aerospace metal finishing plays a critical role in enhancing the durability, safety, and performance of components. By ensuring the proper surface treatment, manufacturers can improve corrosion resistance, extend the lifespan of parts, and optimize their functionality in extreme environments.
At MME, we offer expertise in a wide range of surface finishing techniques, both in-house and through our carefully vetted network of finishing experts. We treat aerospace components with the highest level of precision and care, and we guarantee compliance with all industry regulations.
For a trusted partner in aerospace metal finishing, contact MME today for a quote.