SIST EN 2516:2024
(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 Kobaltlegierungen
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
SIST EN 2516:2024 is a standard published by the Slovenian Institute for Standardization (SIST). 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.
SIST EN 2516:2024 is classified under the following ICS (International Classification for Standards) categories: 49.025.10 - Steels. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 2516:2024 has the following relationships with other standards: It is inter standard links to SIST EN 2516:2020. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase SIST EN 2516:2024 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 SIST 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
...
SIST EN 2516:2024は、耐腐食性鋼（オーステナイト系、フェライト系、マルテンサイト系、および沈殿硬化鋼）のパッシベーションおよびニッケルまたはコバルトベース合金の除染に関する標準として、航空宇宙産業において重要な役割を果たしています。この標準は、様々な化学的な方法を規定しており、それにより耐腐食性鋼の保護と、ニッケル及びコバルト合金の品質向上が図られます。 SIST EN 2516:2024の強みは、具体的な化学プロセスを明確に示している点です。これにより、ユーザーは材料の特性に応じた最適なパッシベーションおよび除染モジュールを選択することができます。特に、オーステナイト系やマルテンサイト系など異なる種類の鋼に対応しているため、広範な応用が可能です。 また、この標準は耐腐食性鋼とコバルト、ニッケル合金の相互作用に着目しており、製造業界における腐食問題を軽減する手助けとなります。これにより、航空宇宙分野における構造部品の寿命が延び、信頼性が向上します。引き続き、エンジニアリングや製造プロセスでの導入が期待され、その結果として業界全体の品質基準を引き上げることに寄与するでしょう。 SIST EN 2516:2024は、航空宇宙産業に必要不可欠な基準として、その適用範囲や強みを活かし、より安全で持続可能な設計を推進するための指針を提供しています。この標準の遵守は、業界の競争力向上にも直結します。
SIST EN 2516:2024 표준은 항공우주 분야에서 부식 방지 강철의 패시베이션과 니켈 또는 코발트 기반 합금의 오염 제거에 대한 여러 화학적 방법을 규정하고 있습니다. 이 문서는 다양한 유형의 강철(오스테나이트, 페라이트, 마르텐사이트 및 침전 경화성 강철)에 대한 패시베이션 방법을 상세히 설명하며, 이는 강철의 내식성을 향상시키고 장기적인 신뢰성을 보장하는 데 중요한 역할을 합니다. 이 표준의 강점 중 하나는 다양한 형태의 강철에 적합한 패시베이션 프로세스를 포괄적으로 다루고 있다는 점입니다. 이는 제조업체가 특정 강철 유형에 맞는 최적의 패시베이션 방법을 선택할 수 있도록 지원하여, 제품의 성능과 내구성을 높이는 데 기여합니다. 또한, 니켈 또는 코발트 기반 합금의 오염 제거 과정에 대한 지침을 포함하여, 해당 합금의 청정도를 확보하는 데 필요한 중요한 절차를 제공합니다. SIST EN 2516:2024의 중요성은 항공우주 산업에서의 내식성 재료 사용의 증가와 함께 더욱 부각되고 있습니다. 이 표준은 엔지니어와 제조업체가 국제적으로 인정받는 절차를 따를 수 있도록 하여, 제작된 부품의 신뢰성과 안전성을 보장합니다. 따라서 이 표준은 항공우주 부문에서 필수적인 문서로 자리 잡고 있으며, 기술의 발전과 함께 지속적으로 개선되어야 할 필요성이 있습니다.
The SIST EN 2516:2024 standard provides a comprehensive framework for the passivation of corrosion-resisting steels and the decontamination of nickel or cobalt base alloys within the aerospace sector. Its scope emphasizes the critical importance of protecting these materials from corrosion, which can significantly affect the longevity and safety of aerospace components. One of the standout strengths of this standard is its detailed specification of various chemical methods for passivation. This variety ensures that manufacturers can select the most appropriate technique based on the specific type of steel they are working with-be it austenitic, ferritic, martensitic, or precipitation hardenable-thus enhancing the corrosion resistance properties effectively. Moreover, by addressing both passivation and decontamination, the standard comprehensively covers the dual challenges faced in maintaining the integrity and performance of these alloys in aerospace applications. The relevance of SIST EN 2516:2024 cannot be overstated, particularly in an industry where material performance is paramount. As aerospace components are subject to harsh environmental conditions, the effective passivation of corrosion-resisting steels is essential for ensuring structural integrity and reducing maintenance costs. Additionally, the decontamination processes outlined for nickel and cobalt base alloys are vital for preventing contamination that can compromise material properties and affect safety. Furthermore, adherence to this standard can lead to standardized practices across the aerospace industry, fostering consistency and reliability in the treatment of metals. As aerospace technology continues to advance, the methodologies specified in SIST EN 2516:2024 will ensure that materials can withstand the increasing demands placed upon them, making this standard a key reference point for industry professionals. The robust guidelines it offers position it as an essential document in the pursuit of excellence in aerospace manufacturing and maintenance practices.
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