EN 2516:2023
(Main)Aerospace series - Passivation of corrosion resisting steels and decontamination of nickel or cobalt base alloys
Aerospace series - Passivation of corrosion resisting steels and decontamination of nickel or cobalt base alloys
This document specifies several chemical methods of passivation for corrosion resisting steels (austenitic, ferritic, martensitic and precipitation hardenable) and of decontamination for nickel or cobalt base alloys.
Luft‑ und Raumfahrt - Passivieren von korrosionsbeständigen Stählen und Dekontaminierung von Nickel- oder Cobaltlegierungen
Dieses Dokument legt mehrere chemische Verfahren zum Passivieren korrosionsbeständiger Stähle (austenitisch, ferritisch, martensitisch und ausscheidungshärtend) und zum Dekontaminieren von Nickel oder Cobaltlegierungen fest.
Série aérospatiale - Passivation des aciers résistant à la corrosion et décontamination des alliages base nickel ou cobalt
Le présent document spécifie plusieurs méthodes de passivation chimiques des aciers résistant à la corrosion (austénitiques, ferritiques, martensitiques et durcis par précipitation), et de décontamination des alliages base nickel ou cobalt.
Aeronavtika - Pasiviranje korozijsko odpornih jekel in dekontaminacija nikljevih ali kolbatovih zlitin
Ta dokument določa več kemičnih metod pasiviranja korozijsko odpornih jekel (avstenitna, feritna, martenzitna jekla in jekla z možnostjo izločevalnega utrjevanja) ter dekontaminacije nikljevih ali kobaltovih zlitin.
General Information
Relations
Overview
EN 2516:2023 (CEN) - “Aerospace series - Passivation of corrosion resisting steels and decontamination of nickel or cobalt base alloys” defines chemical passivation and decontamination methods used in aerospace manufacture to restore or improve corrosion resistance after fabrication. It covers austenitic, ferritic, martensitic and precipitation‑hardenable stainless steels and nickel or cobalt base alloys, specifying process limits, inspection methods and quality assurance requirements. The standard supersedes EN 2516:2020 and includes recommended bath types and procedural controls (Annex A).
Key topics and requirements
- Scope & applicability
- Applies to corrosion resisting steels (austenitic, ferritic, martensitic, precipitation hardenable) and nickel/cobalt base alloys.
- Not applicable to unalloyed/low‑alloy carbon steels, powder metallurgy alloys, case‑hardened/carburized/nitrided surfaces, soldered/brazed parts or parts with unmaskable cavities.
- Surface preparation
- Parts must be fully fabricated prior to treatment. Pre‑treatments (cleaning, degreasing, descaling, blasting, pickling, rinsing, masking) are required and must leave parts substantially free of organic and metallic contamination.
- Passivation / decontamination processes
- Table 1 lists bath types and composition ranges (nitric acid, citric acid, sodium dichromate, copper sulfate and optional wetting agents/inhibitors). Options include anodic treatments and multi‑step procedures.
- De‑embrittlement requirements apply after acid pickling for high‑strength steels (example: steels with UTS ≥ 1 100 MPa require thermal treatment around 190 ± 14 °C for a minimum duration-see Table 2).
- Inspection & acceptance
- Visual inspection: surfaces must be clean and free of pitting or treatment damage (slight discoloration allowed).
- Absence of iron contamination: verified by salt spray (EN ISO 9227 NSS) or copper sulfate test. Copper sulfate test recipe: 8 g CuSO4·5H2O + 2–3 ml H2SO4 in 500 ml demineralized water; keep surface wet ≥ 6 min.
- Process controls
- Water conductivity ≤ 100 µS/cm (unless prime specifies otherwise). Chemical concentrations monitored at regular intervals.
- Drying air must be dry and oil‑free.
- Quality assurance
- Processor must be an approved aerospace production organization with a quality management system (e.g., EN 9100 or equivalent). Process qualification, batch acceptance and fault sanctions are specified.
- Health, safety & environment
- Local regulations shall be followed; the standard draws attention to chemical hazards and waste handling.
Practical applications and users
- Target users: aerospace manufacturers, surface treatment processors, metallurgists, procurement specialists and quality engineers involved in finishing stainless steels and nickel/cobalt alloys for aircraft components.
- Practical uses: specifying passivation methods on procurement documents, qualifying processors, establishing inspection criteria (salt spray and copper sulfate), and ensuring parts meet corrosion resistance after machining, forming, shot peening or pickling.
Related standards
- EN ISO 9227 - Corrosion tests in artificial atmospheres (salt spray)
- EN 9100 (or equivalent) - Aerospace quality management systems
Keywords: EN 2516:2023, passivation, corrosion resisting steels, decontamination, nickel base alloys, cobalt base alloys, aerospace passivation, copper sulfate test, salt spray test, process qualification.
Frequently Asked Questions
EN 2516:2023 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Passivation of corrosion resisting steels and decontamination of nickel or cobalt base alloys". This standard covers: This document specifies several chemical methods of passivation for corrosion resisting steels (austenitic, ferritic, martensitic and precipitation hardenable) and of decontamination for nickel or cobalt base alloys.
This document specifies several chemical methods of passivation for corrosion resisting steels (austenitic, ferritic, martensitic and precipitation hardenable) and of decontamination for nickel or cobalt base alloys.
EN 2516:2023 is classified under the following ICS (International Classification for Standards) categories: 49.040 - Coatings and related processes used in aerospace industry. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 2516:2023 has the following relationships with other standards: It is inter standard links to EN 2516:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase EN 2516:2023 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of CEN standards.
Standards Content (Sample)
SLOVENSKI STANDARD
01-februar-2024
Aeronavtika - Pasiviranje korozijsko odpornih jekel in dekontaminacija nikljevih ali
kolbatovih zlitin
Aerospace series - Passivation of corrosion resisting steels and decontamination of
nickel or cobalt base alloys
Luft- und Raumfahrt - Passivieren von korrosionsbeständigen Stählen und
Dekontaminierung von Nickel- oder Kobaltlegierungen
Série aérospatiale - Passivation des aciers résistant à la corrosion et décontamination
des alliages base nickel ou cobalt
Ta slovenski standard je istoveten z: EN 2516:2023
ICS:
49.025.10 Jekla Steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 2516
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 49.040 Supersedes EN 2516:2020
English Version
Aerospace series - Passivation of corrosion resisting steels
and decontamination of nickel or cobalt base alloys
Série aérospatiale - Passivation des aciers résistant à la Luft- und Raumfahrt - Passivieren von
corrosion et décontamination des alliages base nickel korrosionsbeständigen Stählen und Dekontaminierung
ou cobalt von Nickel- oder Kobaltlegierungen
This European Standard was approved by CEN on 9 July 2023.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2516:2023 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Purpose of process . 4
5 Applicability and limitations of the process . 4
6 Information for the processor . 5
7 Condition of the parts prior to processing. 5
8 Pre-treatments . 5
9 Treatment . 6
9.1 Process approval . 6
9.2 De-embrittlement in case of acid pickling . 7
10 Required characteristics and inspections . 7
10.1 Parts . 7
10.1.1 Visual testing . 7
10.1.2 Absence of iron contamination . 8
10.2 Process . 8
10.2.1 General. 8
10.2.2 Water quality . 8
10.2.3 Passivation and/or decontamination bath . 8
11 Quality assurance . 8
11.1 Approval of the processor. 8
11.2 Process qualification . 9
11.3 Acceptance. 9
11.4 Fault sanction . 9
12 Health, safety and environmental aspects . 9
13 Designation . 9
Annex A (informative) Recommended passivation solutions . 10
Annex B (informative) Standard evolution form . 13
Bibliography . 15
European foreword
This document (EN 2516:2023) has been prepared by the Aerospace and Defence Industries
Association of Europe — Standardization (ASD-STAN).
After enquiries and votes carried out in accordance with the rules of this Association, this
document has received the approval of the National Associations and the Official Services of the
member countries of ASD-STAN, prior to its presentation to CEN.
This document shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2024, and conflicting national standards shall be
withdrawn at the latest by June 2024.
Attention is drawn to the possibility that some of the elements of this document may be the subject
of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 2516:2020.
The main changes with respect to the previous edition are listed in Annex B.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this document: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
1 Scope
This document specifies several chemical methods of passivation for corrosion resisting steels
(austenitic, ferritic, martensitic and precipitation hardenable) and of decontamination for nickel or
cobalt base alloys.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests (ISO 9227)
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
4 Purpose of process
To improve the corrosion resistance characteristics of a part after such treatments as machining,
forming, tumbling and shot peening by removing foreign metal contamination due to these operations.
Passivation shall not be used on castings, welded or brazed parts, carburized or nitrided surfaces nor on
parts with mating surfaces when entrapment of acids may occur.
5 Applicability and limitations of the process
This document is applicable for the corrosion resisting alloys listed in Table A.2.
This document is not applicable for:
— unalloyed or low-alloyed carbon steel;
— powder metallurgy alloys;
— surface modified steel i.e. with case-hardened, carburized or nitrided surfaces;
— soldered or brazed parts;
— items containing joints and cavities where it is not possible to mask prior to passivation or to
ensure complete removal of the passivation solution.
6 Information for the processor
— Designation, refer to Clause 13.
— Reference of the material standard and its metallurgical condition.
— Process schedule, if necessary.
— Areas to be masked.
7 Condition of the parts prior to processing
Fabrication of the parts shall have been completed before treatment.
8 Pre-treatments
All parts shall be submitted to a surface preparation process. The surface preparation process may
include mechanical and/or chemical and/or electrochemical methods, singly or in combination.
Necessary sub steps (e.g. cleaning, degreasing, descaling, abrasive blasting, activation, pickling, rinsing,
drying, masking) depend on the degree of contamination. Although descaling or other steps may be
necessary before passivation can be effective, these steps shall be indicated in the process instructions.
The composition of appropriate surface preparation chemicals may depend on the grade of the
corrosion resisting steel to be treated. Alloying elements, contaminations and mechanical processing
may influence the sensitivity of the corrosion resisting steels and nickel or cobalt base alloys.
The result of the surface preparation treatment shall demonstrate a reproducible process and surface
condition. Particularly, the resulting conditioned parts shall be substantially free of contaminants and
other undesired organic and metallic residues from storage, transport and fabrication processes (e.g.
oil, grease, forming compounds, lubricants, coolants, cutting fluids, rust, scale, foreign metal or other
contaminations).
The surface preparation shall not induce pitting corrosion or intergranular corrosion
...
The EN 2516:2023 standard provides a comprehensive framework for the passivation of corrosion resisting steels and the decontamination of nickel or cobalt base alloys, making it a crucial resource for the aerospace industry. The standard outlines several chemical methods for passivation, covering various types of corrosion resisting steels, including austenitic, ferritic, martensitic, and precipitation hardenable grades. This extensive scope ensures that users have access to a wide range of techniques suited to different materials and applications in aerospace. One of the key strengths of EN 2516:2023 is its thoroughness in addressing both passivation and decontamination processes. By specifying methods for both categories, the standard allows for a holistic approach to surface treatment, enhancing the durability and performance of materials used in high-stakes aerospace environments. This dual focus on corrosion resistance and alloy integrity is particularly relevant given the industry's stringent safety and performance standards. Moreover, the standard's relevance in today's aerospace landscape cannot be overstated. With increasing demands for lightweight and corrosion-resistant materials, the methods outlined in EN 2516:2023 provide essential guidelines for manufacturers seeking to maintain the highest quality in their products. The effective passivation of corrosion resisting steels is crucial for ensuring long-term performance in aerospace applications, while the decontamination of nickel and cobalt base alloys helps prevent component failures that could arise from contamination. In summary, EN 2516:2023 stands out as a pivotal standard that not only delineates a variety of chemical passivation methods but also emphasizes the importance of decontamination practices for critical aerospace materials. Its robust scope and focus on industry-relevant processes make it an indispensable reference for aerospace professionals committed to enhancing material performance and ensuring safety in their operations.
EN 2516:2023 표준은 우주 항공 산업에서 부식 저항 강철의 패시베이션과 니켈 또는 코발트 기반 합금의 탈오염을 위한 다양한 화학적 방법을 명시하고 있습니다. 이 표준의 범위는 오스테나이트계, 페라이트계, 마르텐사이트계, 그리고 석출 강화 강철을 포함한 여러 유형의 강철에 대한 패시베이션 방법과 관련하여 매우 포괄적입니다. 또한, 니켈 및 코발트 합금의 탈오염 과정에 대한 세부사항을 제공함으로써 해당 분야에서의 적용 가능성을 높이고 있습니다. 이 표준의 강점을 살펴보면, 첫째로 다양한 강종 및 합금에 적용 가능한 구체적인 화학적 방법이 제시되어 있어, 실무에서의 사용이 용이합니다. 예를 들어, 오스테나이트계 강철의 경우 특수한 화학 처리를 통해 뛰어난 내식성을 확보할 수 있는 방법이 명시되어 있습니다. 둘째로, 부식 방지 기술이 더욱 발전함에 따라 최신 연구 결과를 바탕으로 업데이트된 이 표준은 현대 항공우주 응용에 적합하도록 설계되었습니다. 또한, EN 2516:2023 표준은 국제적인 방침 및 규제를 준수하여 우주 항공 산업의 안전성을 높이는 데에도 중요한 역할을 합니다. 이는 제조업체들이 부식 저항 강철 및 니켈 또는 코발트 합금의 적절한 처리를 통해 제품의 신뢰성 및 내구성을 보장할 수 있도록 지원합니다. 이러한 점에서 EN 2516:2023 표준은 항공우주 산업의 핵심적인 문서로 자리 잡고 있습니다. 결론적으로, EN 2516:2023 표준은 현대 항공우주 분야에서 부식 문제를 해결하고, 재료의 안전성과 신뢰성을 높이는 데 기여하는 중요한 문서입니다. 그 포괄적인 범위와 실용적인 방법론은 관련 산업 종사자들에게 유용한 참고자료가 될 것입니다.
EN 2516:2023は、航空宇宙分野における腐食耐性鋼およびニッケルまたはコバルトベース合金のパッシベーションと除染に関する重要な標準である。この標準は、オーステナイト系、フェライト系、マルテンサイト系、及び沈殿硬化型の腐食耐性鋼に対する複数の化学的パッシベーション方法を指定しており、ニッケル及びコバルトベース合金の除染プロセスも含まれている。 この文書の強みは、その広範な適用範囲にある。特に、様々なタイプの腐食耐性鋼の特性に応じたパッシベーション技術を詳細に定義しているため、製造業者やエンジニアにとって実用的なガイドラインとなる。また、ニッケルおよびコバルト合金の除染方法も同時に示されているため、材料の特性を最大限に活かすためのプロセスにおいて重要な役割を果たす。 さらに、EN 2516:2023は、国際的な規格に基づいているため、グローバルな航空宇宙産業における一貫性と信頼性を提供する。この標準に従うことで、高性能材料の腐食や汚染からの劣化を防ぎ、製品の耐久性と安全性を確保できる点が非常に重要である。これにより、航空機部品の寿命が延び、メンテナンスコストの削減にも寄与する。 したがって、EN 2516:2023は、航空宇宙メーカーや関連する企業にとって不可欠な参考資料であり、パッシベーションや除染に関するベストプラクティスを確実に実施するための基盤を提供する。
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