FprEN 2516

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

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 zlitin

General Information

• Status: Not Published
• Publication Date: 10-Sep-2023
• Withdrawal Date: 25-Jul-2022
• ICS: 49.040 - Coatings and related processes used in aerospace industry
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 4/S 6 - Surface treatments for Metallic
• Current Stage: 6055 - CEN Ratification completed (DOR) - Publishing
• Start Date: 09-Jul-2023
• Completion Date: 09-Jul-2023
• Ref Project: kSIST FprEN 2516:2023 - Aerospace series - Passivation of corrosion resisting steels and decontamination of nickel base alloys

Relations

• Revises: EN 2516:2020 - Aerospace series - Passivation of corrosion resisting steels and decontamination of nickel base alloys
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 2516:2020
01-oktober-2020
Aeronavtika - Pasiviranje korozijsko odpornih jekel in dekontaminacija nikljevih
zlitin
Aerospace series - Passivation of corrosion resisting steels and decontamination of
nickel base alloys
Luft- und Raumfahrt - Passivieren von korrosionsbeständigen Stählen und
Dekontaminierung von Nickellegierungen
Série aérospatiale - Passivation des aciers résistants à la corrosion et décontamination
des alliages base nickel
Ta slovenski standard je istoveten z: prEN 2516
ICS:
49.025.10 Jekla Steels
oSIST prEN 2516:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 2516:2020

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oSIST prEN 2516:2020


DRAFT
EUROPEAN STANDARD
prEN 2516
NORME EUROPÉENNE

EUROPÄISCHE NORM

July 2020
ICS Will supersede EN 2516:2020
English Version

Aerospace series - Passivation of corrosion resisting steels
and decontamination of nickel base alloys
Série aérospatiale - Passivation des aciers résistants à Luft- und Raumfahrt - Passivieren von
la corrosion et décontamination des alliages base korrosionsbeständigen Stählen und Dekontaminierung
nickel von Nickellegierungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee ASD-
STAN.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Turkey and
United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 2516:2020 E
worldwide for CEN national Members.

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oSIST prEN 2516:2020
prEN 2516:2020 (E)
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 . 7
9.1 Process approval . 7
10 Required characteristics and inspections. 8
10.1 Parts . 8
10.1.1 Visual testing . 8
10.1.2 Absence of iron contamination . 8
10.2 Process . 9
10.2.1 General . 9
10.2.2 Water quality . 9
10.2.3 Passivation and/or decontamination bath . 9
11 Quality assurance . 9
11.1 Approval of the processor . 9
11.2 Process qualification . 9
11.3 Acceptance . 9
11.4 Fault sanction . 9
12 Health, safety and environmental aspects . 9
13 Designation . 10
Annex A (normative) Recommended passivation solutions . 11
Annex B (informative) Standard evolution form . 13
Bibliography . 15


2

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oSIST prEN 2516:2020
prEN 2516:2020 (E)
European foreword
This document (prEN 2516:2020) 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 Standard 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 is currently submitted to the CEN Enquiry.
This document will supersede EN 2516:2020.
Modifications compared to the previous edition are the following:
— the temperature of the de-embrittlement shall be less than 50 °C of the ageing (precipitation) or
tempering temperature, except otherwise agreed by the prime,
— there is no more sub-type A) or B) for type C1,
— nitric acid concentration (ml/l) for type C3/A) is from 200 ml/l to 250 ml/l,
— nitric acid concentration (ml/l) for type C4/A) is from 200 ml/l to 250 ml/l,
— sodium dichromate concentration (g/l) for type C1 is from 20 g/l to 30 g/l,
— water conductivity requirement is now a requirement except otherwise defined by the prime.
3

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oSIST prEN 2516:2020
prEN 2516:2020 (E)
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 terminological databases for use in standardization at the following addresses:
• ISO Online browsing platform: available at http://www.iso.org/obp
• IEC Electropedia: available at http://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 specification is applicable for the following corrosion resisting alloys:
— austenitic steels;
— austenitic ferritic steels;
— martensitic chromium steels;
— ferritic steels;
— austenitic precipitation hardenable steels;
— martensitic precipitation hardenable steels;
— heat resisting nickel or cobalt base alloys.
This specification 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;
4

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oSIST prEN 2516:2020
prEN 2516:2020 (E)
— soldered or brazed alloys;
— 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,
...