EN 4881:2023

SLOVENSKI STANDARD
01-januar-2024
Aeronavtika - Mikroobločna oksidacija aluminija in aluminijevih zlitin
Aerospace series - Micro-arc oxidation of aluminium and aluminium alloys
Luft- und Raumfahrt - Mikrolichtbogenoxidation von Aluminium und
Aluminiumlegierungen
Série aérospatiale - Oxydation micro-arc de l'aluminium et des alliages d'aluminium
Ta slovenski standard je istoveten z: EN 4881:2023
ICS:
25.160.10 Varilni postopki in varjenje Welding processes
49.025.20 Aluminij Aluminium
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 4881
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2023
EUROPÄISCHE NORM
ICS 25.160.10; 49.025.20
English Version
Aerospace series - Micro-arc oxidation of aluminium and
aluminium alloys
Série aérospatiale - Oxydation micro-arc de Luft- und Raumfahrt - Mikro-Lichtbogenoxidation von
l'aluminium et des alliages d'aluminium Aluminium und Aluminiumlegierungen
This European Standard was approved by CEN on 30 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 4881:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
3.1 General terms . 5
3.2 Technical terms . 6
4 General principles of the process . 7
4.1 Purpose of the process . 7
4.2 Applicability . 7
4.2.1 Type A: As processed . 7
4.2.2 Type B: After blasting operation . 7
4.2.3 Type C: After machining operation. 8
4.3 Limitations . 8
4.4 Classifications . 8
4.4.1 System Types . 8
4.4.2 Layer thicknesses. 8
5 Process requirements . 9
5.1 Information for the processor . 9
5.2 Process schedule (information) . 9
5.3 Process conditions . 10
5.3.1 Tooling . 10
5.3.2 Masking . 10
5.3.3 Surface pre-treatment . 10
5.3.4 Micro-arc oxidation . 10
5.3.5 Micro-arc oxidation post-treatments . 12
5.3.6 Water quality . 12
5.4 Periodic bath chemical analysis . 12
5.5 Re-processing . 13
5.6 Glass bead blasting of the friable/porous layer. 13
5.7 Machining . 13
6 Test specimens requirements . 13
6.1 General. 13
6.2 Materials . 14
6.3 Tests for the qualification . 14
6.4 Periodic tests . 14
7 Parts requirements . 14
7.1 Conditions of parts prior to the treatment . 14
7.2 Inspections before the processing . 14
7.3 Inspections after micro-arc oxidation . 14
8 Quality assurance . 15
8.1 Process approval . 15
8.2 General. 15
Annex A (normative) Tests on specimens for the qualification . 16
Annex B (normative) Periodic tests on test specimens . 20
Annex C (normative) Tests on parts . 22
Annex D (normative) Wear resistance test . 23
Bibliography . 24

European foreword
This document (EN 4881:2023) 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 May 2024, and conflicting national standards shall be withdrawn at
the latest by May 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.
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 defines the requirements for micro-arc oxidation of aluminium and aluminium alloys for
corrosion protection, wear, erosion, dielectric and thermal properties.
The purpose of this document is to give design, quality and manufacturing requirements. It does not
give complete in-house process instructions; these are given in the processors detailed process
instructions.
This document relates only to micro-arc oxidation. It does not relate to finishing techniques, such as
mechanical post treatment.
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 6072, Aerospace series — Metallic materials — Test methods — Constant amplitude fatigue testing
EN ISO 2409, Paints and varnishes — Cross-cut test
EN ISO 4516, Metallic and other inorganic coatings — Vickers and Knoop microhardness tests
EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests
ASTM D4060, Standard Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser
3 Terms and definitions
3.1 General terms
For the purposes of this document, the following terms and definitions apply.
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/
3.1.1
OEM
producer who has the design authority and manufactures products or components that are purchased
by a company and retailed under that purchasing company’s brand name
Note 1 to entry: The manufacturer can also apply the process.
3.1.2
manufacturer
company or person who makes, manufactures, assembles components

Published by: ASTM International (US) https://www.astm.org/.
3.1.3
processor
company or person who applies the process
3.1.4
process instruction
document that describes the application scopes, detailed process (key parameters, detailed steps, etc.),
quality management, environmental and safety regulations
Note 1 to entry: Other examples of documents can be descripted as a process instruction.
3.1.5
batch
parts of the same type (i.e. shape, size, material), processed at the same time in the same bath
Note 1 to entry: Unless otherwise specified.
3.2 Technical terms
3.2.1
mechanically disturbed layer
MDL
layer that is present at the surface resulting from the heat treatment and rolling process of the material
3.2.2
pit
surface corrosion defect at which the oxide layer is penetrated and/or perforated
Note 1 to entry: Typical characteristics of corrosion pit
...