AMS 2700

by | Apr 25, 2024

Key Takeaways:

  • Compliance and Quality Assurance:  Adhering to AMS 2700 specifications ensures aerospace manufacturing meets corrosion resistance standards, enhancing component longevity and reliability.
  • Passivation Methods and Solutions: Understanding various passivation methods and solutions in AMS 2700 helps choose the most suitable approach for aerospace applications, considering factors like environmental impact and material compatibility.
  • Testing and Acceptance Criteria: Following AMS 2700 testing procedures and acceptance criteria validates passivation effectiveness, ensuring quality and compliance with industry standards in aerospace, automotive, and medical sectors.


The AMS 2700 specification serves as a cornerstone, providing industry professionals with essential guidelines for the selection, processing, and testing of materials used in aerospace applications. Developed by the Society of Automotive Engineers (SAE), AMS 2700 establishes rigorous requirements to ensure the quality, reliability, and performance of materials and processes utilized in the fabrication of aerospace components.

This article is a comprehensive resource, offering insights, interpretations, and practical applications of AMS 2700 to aid professionals in navigating the complexities of aerospace materials and processes.

Valence Surface Technologies, as the world’s largest independent aerospace surface finishing company, fully understands the importance of AMS 2700 compliance. With our expertise and state-of-the-art facilities, we offer unparalleled passivation services that meet and exceed AMS 2700 standards. Our commitment to quality and precision makes us the trusted partner for companies seeking top-of-the-line surface finishing solutions in the aerospace, defense, space, and satellite industries.


Understanding AMS 2700: The Key To Effective Passivation

AMS 2700 is a specification established by the Society of Automotive Engineers (SAE) that outlines the requirements for the passivation of corrosion-resistant steels. This specification defines the types of chemicals, concentrations, temperatures, immersion times, and testing methods to be used during the passivation process.

Compliance with AMS 2700 is vital in the aerospace industry as it ensures that the passivation process meets the necessary standards for corrosion resistance. The proper execution of passivation as per AMS 2700 not only enhances the longevity of aerospace components but also ensures their performance and reliability under extreme conditions.


Exploring The Importance Of AMS 2700 In Corrosion Resistance

AMS 2700 outlines the requirements for applying protective coatings and surface treatments to aerospace parts and materials to enhance their corrosion resistance. This standard establishes the procedures for testing, evaluating, and approving these processes to ensure that the coatings effectively protect against corrosion in challenging aerospace environments.


Corrosion Prevention

In aerospace, where components endure extreme conditions, corrosion can jeopardize performance. AMS 2700-certified treatments provide a protective barrier, extending component lifespan and minimizing failures.


Strategic Advantage

Leveraging AMS 2700-compliant processes offers a strategic edge in meeting aerospace quality and performance standards. Prioritizing protective coatings according to AMS 2700 guidelines enhances product durability, reliability, and operational efficiency.


Significance In Competitive Landscape

AMS 2700 plays a crucial role in aerospace manufacturing competitiveness by ensuring compliance with industry standards and demonstrating a commitment to superior product quality and performance.


AMS 2700 Passivation Methods Demystified: Immersion, Swab, And Electropolishing

When it comes to AMS 2700 passivation methods, understanding the differences between immersion, swab, and electropolishing is crucial for achieving the desired surface finishing results in aerospace applications.


Immersion Passivation

This widely utilized method involves submerging the component in a passivation solution to remove free iron and other contaminants from its surface. The immersion process creates a protective oxide layer that enhances the component’s resistance to corrosion. This method is highly effective for treating complex geometries and large quantities of parts.

Swab Passivation

The passivation solution is applied to the component’s surface using a swab or cloth. This method allows for more controlled and localized treatment of specific areas that are difficult to reach through immersion. Swab passivation is often chosen for delicate or intricate parts that require precision in the passivation process.


This advanced passivation method is highly effective in achieving a smooth, clean, and bright finish on stainless steel components. This process involves the removal of surface material through an electrochemical reaction, resulting in improved corrosion resistance and aesthetic appeal. Electropolishing is ideal for components with tight tolerances and high cosmetic requirements.

Each of the above methods offers unique advantages and considerations, contributing to the overall quality and performance of aerospace components.


Deciphering Passivating Solutions: Nitric Acid vs. Citric Acid In AMS 2700

In AMS 2700 specifications, two commonly utilized passivating solutions are Nitric Acid and Citric Acid. Differentiating between these options and grasping their respective advantages is imperative in aerospace surface finishing.


Nitric Acid Passivation

Nitric Acid passivation has been traditionally used in aerospace applications for its excellent corrosion resistance properties. It effectively removes free iron and other contaminants from the surface, enhancing the material’s resistance to rust and corrosion. However, one of the drawbacks of Nitric Acid is its tendency to create hazardous fumes and waste, requiring careful handling and disposal processes to ensure environmental safety.


Citric Acid Passivation

In recent years, Citric Acid has emerged as a more environmentally friendly alternative to Nitric Acid passivation. Citric Acid offers comparable corrosion resistance properties while being safer to handle and dispose of. It is biodegradable and less hazardous, making it a popular choice for companies looking to reduce their environmental impact without compromising on quality.


Choosing The Right Passivating Solution

When deciding between Nitric Acid and Citric Acid passivation in AMS 2700, several factors must be taken into account, including environmental impact, safety requirements, and material compatibility. While Nitric Acid may offer superior corrosion resistance, Citric Acid provides a more sustainable and safer option for surface finishing processes.

Ultimately, the choice between Nitric Acid and Citric Acid passivation in AMS 2700 depends on your specific needs and priorities. Both solutions have their advantages and considerations, so it’s crucial to evaluate them carefully to determine the best fit for your aerospace surface finishing requirements.


Testing Procedures Under AMS 2700: Ensuring Quality And Compliance

Testing procedures under AMS 2700 are crucial for ensuring the quality and compliance of passivated corrosion-resistant steel parts. These procedures help verify that the passivation process has been effectively carried out and that the parts meet the required standards for corrosion resistance. Here are some key aspects of testing procedures under AMS 2700:

  • Free Iron Testing: One of the primary tests prescribed by AMS 2700 is evaluating the surface for the presence of free iron. Free iron can compromise the corrosion resistance of stainless steel parts. Testing involves using a chemical indicator or a test solution to detect the presence of free iron on the surface of the part.
  • Corrosion Resistance Testing: AMS 2700 may also require corrosion resistance testing to assess the overall effectiveness of the passivation process. This testing typically involves subjecting the passivated parts to specific corrosive environments, such as salt spray or humidity chambers, and evaluating their resistance to corrosion over time.
  • Testing Methods: The specification outlines specific testing methods and procedures to be followed for free iron testing and corrosion resistance testing. These methods may include visual inspection, chemical analysis, or specialized equipment and techniques for evaluating corrosion resistance.
  • Acceptance Criteria: AMS 2700 provides acceptance criteria that define the allowable levels of free iron and performance standards for corrosion resistance. Parts must meet these criteria to be considered compliant with the specification.
  • Documentation: Proper documentation of testing procedures and results is essential for demonstrating compliance with AMS 2700. This documentation typically includes test reports, records of test parameters and conditions, and any corrective actions taken if the parts do not meet the required standards.


Free Iron Testing


Acceptance Criteria In AMS 2700: Determining Passivation Success

One of the key aspects of AMS 2700 is the determination of acceptable levels of residual surface contamination after passivation. This includes criteria such as maximum allowable levels of iron and other metal ions on the surface of the treated parts. The standard also specifies procedures for testing the effectiveness of the passivation process, including methods for detecting the presence of free iron on the surface.

In addition to chemical requirements, AMS 2700 also outlines guidelines for visual inspection of passivated parts. This involves assessing the surface for discoloration, staining, or other visual defects that may indicate inadequate passivation. The standard provides detailed criteria for evaluating the appearance of passivated parts and determining whether they meet the visual acceptance standards.


Practical Applications Of AMS 2700 In Aerospace, Automotive, And Medical Industries

AMS 2700 plays a critical role in ensuring the quality and performance of corrosion-resistant steel parts in a variety of industries, including aerospace, automotive, and medical. Here are some practical applications of AMS 2700 in each of these industries:


Aerospace Industry

The aerospace sector relies heavily on precision and durability, making surface finishing processes crucial for enhancing corrosion resistance, wear resistance, and overall part longevity. AMS 2700 specifications ensure that surface treatments are performed to exacting standards, contributing to the reliability and performance of aerospace components even under harsh operating conditions.


Aerospace Industry


Automotive Industry

In the automotive industry, AMS 2700 plays a significant role in ensuring the longevity and performance of critical parts and components. Surface finishing treatments compliant with AMS 2700 specifications can improve the corrosion resistance of automotive parts, enhancing their durability and extending their service life. Additionally, these treatments can provide aesthetic benefits, such as improved appearance and surface smoothness, enhancing the overall quality of automotive products.


Medical Industry

Many surgical instruments are made of stainless steel due to its durability, biocompatibility, and resistance to corrosion. Passivation according to AMS 2700 ensures that these instruments meet stringent quality and safety standards, reducing the risk of contamination and infection during medical procedures.

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Frequently Asked Questions On AMS-2700

Why is passivation important according to AMS 2700?

Passivation is crucial as outlined in AMS 2700 because it helps in enhancing the corrosion resistance of stainless steel and other metals by removing surface contaminants and creating a passive oxide layer. This process ensures the longevity and reliability of critical aerospace components, essential for safety and performance standards in the aerospace industry.

What are the key components of passivating solutions according to AMS 2700?

According to AMS 2700, the key components of passivating solutions include nitric acid or citric acid bases. The standard details specific concentrations, temperatures, and contact times to achieve the desired passivation layer on metal surfaces, helping to tailor the process to different materials and their unique resistance needs.

How does AMS 2700 ensure the effectiveness of passivation?

AMS 2700 ensures the effectiveness of passivation by specifying stringent criteria for the process, including the solution’s composition, treatment duration, and temperature. Moreover, it mandates post-treatment testing methods such as high humidity, salt spray, and copper sulfate testing to verify the formation of a passive layer and the absence of free iron on the metal surface.

What industries benefit from compliance with AMS 2700?

Industries that benefit from compliance with AMS 2700 extend beyond aerospace to include defense, space and satellite, medical device manufacturing, and any sector requiring high-performance corrosion-resistant metal components. Adhering to AMS 2700 helps these industries maintain a high standard of reliability and durability in their products.

Can AMS 2700 be applied to both small and large-scale production?

Yes. The standard provides the flexibility to adapt the passivation process to different production volumes, making it equally effective for high-volume manufacturing lines as for custom, one-off aerospace components.

How often should passivation be performed according to AMS 2700?

AMS 2700 does not prescribe a specific frequency for performing passivation, as the need for re-passivation largely depends on the part’s usage conditions, environment, and material. However, it is generally recommended to passivate parts after each machining, and fabrication, or when there is evidence of surface contamination or degradation.

Is AMS 2700 a global standard?

Yes, AMS 2700 is recognized as a global standard for the passivation of stainless steel and other metals. It is widely adopted by aerospace, defense, and other industries worldwide to ensure consistency and quality in the passivation process, enhancing the longevity and performance of key components.

Does AMS 2700 provide guidelines for handling and disposal of passivation solutions?

AMS 2700 includes guidelines for the safe handling and disposal of passivation solutions, emphasizing the importance of environmental responsibility and worker safety. The standard outlines the necessary precautions to prevent exposure to harmful chemicals and the proper disposal methods to mitigate environmental impact, ensuring compliance with local regulations and standards.

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