SIST EN 2133:2026

SLOVENSKI STANDARD
01-december-2026
Aeronavtika - Kadmiranje jekla z določeno natezno trdnostjo ≤ 1450 MPa z bakrom,
bakrovimi in nikljevimi zlitinami
Aerospace series - Cadmium plating of steels with specified tensile strength ≤ 1 450
MPa, copper, copper alloys and nickel alloys
Luft- und Raumfahrt - Cadmieren von Stählen mit einer Zugfestigkeit ≤ 1 450 MPa,
Kupfer, Kupferlegierungen und Nickellegierungen
Série aérospatiale - Cadmiage électrolytique des aciers de résistance ≤ 1 450 MPa, du
cuivre, des alliages de cuivre et des alliages de nickel
Ta slovenski standard je istoveten z: EN 2133:2026
ICS:
49.040 Prevleke in z njimi povezani Coatings and related
postopki, ki se uporabljajo v processes used in aerospace
letalski in vesoljski industriji industry
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 2133
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2026
EUROPÄISCHE NORM
ICS 49.040 Supersedes EN 2133:2020
English Version
Aerospace series - Cadmium plating of steels with
specified tensile strength  1 450 MPa, copper, copper
alloys and nickel alloys
Série aérospatiale - Cadmiage électrolytique des aciers Luft- und Raumfahrt - Cadmieren von Stählen mit einer
de résistance  1 450 MPa, du cuivre, des alliages de Zugfestigkeit  1 450 MPa, Kupfer, Kupferlegierungen
cuivre et des alliages de nickel und Nickellegierungen
This European Standard was approved by CEN on 17 August 2026.

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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 2133:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Abbreviated term . 6
5 Purpose of process . 6
6 Limitations of process use . 7
7 Coating thickness . 7
8 Information for the manufacturer . 7
9 Condition of parts prior to the treatment . 7
10 Process schedule . 8
10.1 General. 8
10.2 Masking . 8
10.3 Surface pre-treatment . 8
10.4 Nickel strike . 8
10.5 Cadmium plating . 8
11 Post treatment . 9
11.1 Hydrogen-embrittlement-relief heat treatment . 9
11.2 Post-treatment . 9
12 Removal of the plating . 9
13 Required characteristics . 10
13.1 Appearance . 10
13.2 Adhesion . 10
13.3 Coating thickness . 10
13.4 Hydrogen embrittlement of steels . 10
13.5 Corrosion resistance . 10
14 Test methods . 11
14.1 For process approval . 11
14.1.1 Appearance . 11
14.1.2 Adhesion . 11
14.1.3 Coating thickness . 11
14.1.4 Hydrogen embrittlement . 11
14.1.5 Corrosion resistance . 12
14.2 For acceptance of parts . 12
14.2.1 Appearance . 12
14.2.2 Adhesion . 12
14.2.3 Coating thickness . 12
15 Periodic tests . 12
16 Quality assurance . 13
16.1 Approval of the manufacturer . 13
16.2 Process approval. 13
16.3 Acceptance . 13
16.4 Reprocessing . 14
16.5 Periodic chemical analysis . 14
17 Designation . 14
Annex A (normative) Process flow . 15
Annex B (informative) Standard evolution form . 16
Bibliography . 19
European foreword
This document (EN 2133:2026) has been prepared by 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 April 2027, and conflicting national standards shall be withdrawn at
the latest by April 2027.
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 2133:2020.
— making the nickel strike optional instead of mandatory;
— clarifying the definitions of brightener and wetting agent;
— providing clarification on the heat treatment;
— adding the option to perform de-embrittlement heat treatment after removal and re-plating if both
processes take less than 4 h;
— including information on post-treatment in type 3;
— adding an introductory sentence before the different types of cadmium plating;
— modifying Annex A.
See also Annex B for a list of technical changes.
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 the electrolytic cadmium plating of parts and fasteners in steel of tensile
strength UTS ≤ 1 450 MPa, copper, copper alloys and nickel alloys, whose temperature in service does
not exceed 235 °C.
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 2828, Aerospace series — Adhesion test for metallic coatings by burnishing
EN 2831, Aerospace series — Hydrogen embrittlement of steels — Test by slow bending
EN 2832, Aerospace series — Hydrogen embrittlement of steels — Notched specimen test
EN ISO 1463, Metallic and oxide coatings — Measurement of coating thickness — Microscopical method
(ISO 1463)
EN ISO 2082, Metallic and other inorganic coatings — Electroplated coatings of cadmium with
supplementary treatments on iron or steel (ISO 2082)
EN ISO 2177, Metallic coatings — Measurement of coating thickness — Coulometric method by anodic
dissolution (ISO 2177)
EN ISO 2178, Non-magnetic coatings on magnetic substrates — Measurement of coating thickness —
Magnetic method (ISO 2178)
EN ISO 2409, Paints and varnishes — Cross-cut test (ISO 2409)
EN ISO 2819, Metallic coatings on metallic substrates — Electrodeposited and chemically deposited
coatings — Review of methods available for testing adhesion (ISO 2819)
EN ISO 3497, Metallic coatings — Measurement of coating thickness — X-ray spectrometric methods (ISO 3497)
EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests (ISO 9227)
ISO 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ASTM B117-19, Standard Practice for Operating Salt Spray (Fog) Apparatus
ASTM F519-18, Standard Test Method for Mechanical Hydrogen Embrittlement — Evaluation of
Plating/Coating Process and Service Environments
NASM 1312-5, Fastener test methods — Method 5 — Stress durability
NASM 1312-14, Fastener test methods — Method 14 — Stress durability, internally threaded fasteners

Published by: American Society for Testing and Materials (ASTM International), available at:
https://www.astm.org/.
Published by Aerospace Industries Association (AIA), available at: https://www.aia-aerospace.org/.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological 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
batch
unless otherwise specified, parts of the same type (shape, size, material), treated at the same time in the
same baths
Note 1 to entry: For mechanical parts, hydrogen embrittlement relieved at the same time.
3.2
pre-production part
part representative of future production
3.3
brightener
organic or metallic compound that, when added to alkaline cyanide cadmium plating baths, influence
the formation of the electrodeposited cadmium crystals
3.4
wetting agent
chemical that can be added to a liquid to reduce its surface tension and make it more effective in
spreading over and penetrating surfaces
4 Abbreviated term
For the purposes of this document, the following abbreviation applies:
UTS Ultimate tensile strength
5 Purpose of process
To ensure protection against corrosion or to reduce the effects of galvanic coupling when assembling
different materials, e.g. steel, aluminium or magnesium. Cadmium plating shall be of the following types
as specified in the purchase order:
— Type 1: as plated;
— Type 2: with hexavalent chromium based post-treatment;
— Type 3: without hexavalent chromium based post-treatment.
If the type is not specified by the purchase order, the choice between Type 2 or 3 is left to the supplier.
6 Limitations of process use
Contact of cadmium plated parts with titanium, titanium alloys, fuels and fuel lines is not recommended.
— It could be accepted at temperatures <150 °C.
— It is inadmissible at temperatures ≥150 °C.
7 Coating thickness
Unless otherwise specified in the product standard or definition document, the coating thicknesses are
as follows:
— Class A: 10 µm to 20 µm;
— Class B: 5 µm to 14 µm;
— Class C: 5 µm to 10 µm.
NOTE These thicknesses refer to the cadmium coating only (including the post-treatment). The nickel strike
thicknesses are consi
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