Aerospace series - Anodic electrodeposition of hexavalent chromium free primer

This document defines the requirements for hexavalent chromium free anodic electrodeposition of organic coatings on aluminium and aluminium alloys for corrosion protection of parts.
The purpose of this standard is to give design, quality and manufacturing requirements. It doesn’t give complete in-house process instructions; these shall be given in the processor detailed process instructions.

Luft- und Raumfahrt - Anodische Elektrotauchlackierung von sechswertiger chromfreier Grundierung

Dieses Dokument definiert die Anforderungen für die anodische Elektrotauchlackierung zum Korrosionsschutz von Teilen aus Aluminium und Aluminiumlegierungen mit organischen Beschichtungen ohne Verwendung von sechswertigem Chrom.
Der Zweck dieser Norm ist die Festlegung von Gestaltungs-, Qualitäts- und Herstellungsanforderungen. Diese Norm gibt keine vollständigen Anweisungen für interne Prozesse; diese müssen in den detaillierten Prozessanweisungen des Verarbeiters festgelegt werden.

Série aérospatiale - Electrodéposition anodique d'un primaire sans chrome hexavalent

Le présent document définit les exigences relatives à l'électrodéposition anodique sans chrome hexavalent de revêtements organiques sur l'aluminium et les alliages d'aluminium pour assurer la protection contre la corrosion de pièces vis-à-vis de la corrosion.
L'objet de la présente norme est d'indiquer les exigences de conception, de qualité et de fabrication. Elle ne donne pas de gamme de production complète ; ces informations doivent être données dans les instructions détaillées de l’applicateur relatives au procédé.

Aeronavtika - Anodno potopno barvanje s temeljno barvo brez šestvalentnega kroma

Ta dokument določa zahteve za anodno potopno barvanje organskih prevlek na aluminiju ali aluminijevih zlitinah s temeljno barvo brez šestvalentnega kroma za korozijsko zaščito vseh delov. Namen tega standarda je določiti zahteve glede zasnove, kakovosti in proizvodnje. Ne podaja popolnih navodil glede internega postopka, ki bodo podana v podrobnih navodilih izvajalcev postopka glede postopka.

General Information

Status
Published
Publication Date
03-Sep-2019
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
04-Sep-2019
Completion Date
04-Sep-2019

Buy Standard

Standard
EN 4868:2019
English language
18 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 4868:2019
01-november-2019
Aeronavtika - Anodno potopno barvanje s temeljno barvo brez šestvalentnega
kroma
Aerospace series - Anodic electrodeposition of hexavalent chromium free primer
Luft- und Raumfahrt - Anodische Elektrotauchlackierung von sechswertigem
chromfreiem Grundierung

Série aérospatiale - Electrodéposition anodique d'un primaire sans chrome hexavalent

Ta slovenski standard je istoveten z: EN 4868:2019
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
87.020 Postopki za nanašanje Paint coating processes
barvnih premazov
SIST EN 4868:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 4868:2019
---------------------- Page: 2 ----------------------
SIST EN 4868:2019
EN 4868
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2019
EUROPÄISCHE NORM
ICS 49.040
English Version
Aerospace series - Anodic electrodeposition of hexavalent
chromium free primer

Série aérospatiale - Electrodéposition anodique d'un Luft- und Raumfahrt - Anodische

primaire sans chrome hexavalent Elektrotauchlackierung von sechswertigem
chromfreiem Grundierung
This European Standard was approved by CEN on 5 May 2019.

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, Turkey 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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 4868:2019 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 4868:2019
EN 4868:2019 (E)
Contents Page

European foreword ...................................................................................................................................................... 3

1 Scope .................................................................................................................................................................... 4

2 Normative references .................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 5

4 Purpose of process ......................................................................................................................................... 6

5 Protection system classification ................................................................................................................ 6

6 Process requirements ................................................................................................................................... 7

7 Required characteristics .............................................................................................................................. 9

8 Quality requirements .................................................................................................................................... 9

Annex A (normative) Engineering requirements ........................................................................................... 11

Annex B (normative) Tests methods ................................................................................................................... 15

Annex C (normative) Parts acceptance inspections ...................................................................................... 16

Annex D (normative) Periodic tests requirements ........................................................................................ 17

Bibliography .................................................................................................................................................................. 18

---------------------- Page: 4 ----------------------
SIST EN 4868:2019
EN 4868:2019 (E)
European foreword

This document (EN 4868:2019) 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, prior to its presentation to CEN.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by March 2020, and conflicting national standards shall be

withdrawn at the latest by March 2020.

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 European Standard: 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 the United

Kingdom.
---------------------- Page: 5 ----------------------
SIST EN 4868:2019
EN 4868:2019 (E)
1 Scope

This document defines the requirements for hexavalent chromium free anodic electrodeposition of

organic coatings on aluminium and aluminium alloys for corrosion protection of parts.

The purpose of this standard is to give design, quality and manufacturing requirements. It doesn’t give

complete in-house process instructions; these shall be given in the processor detailed process

instructions.
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 3840, Aerospace series — Paints and varnishes — Technical specification

EN ISO 1463, Metallic and oxide coatings — Measurement of coating thickness — Microscopical method

EN ISO 1518-1, Paints and varnishes — Determination of scratch resistance — Part 1: Constant-loading

method
EN ISO 1519, Paints and varnishes — Bend test (cylindrical mandrel)

EN ISO 2360, Non-conductive coatings on non-magnetic electrically conductive base metals —

Measurement of coating thickness — Amplitude-sensitive eddy-current method
EN ISO 2409, Paints and varnishes — Cross-cut test

EN ISO 2812-1, Paints and varnishes — Determination of resistance to liquids — Part 1: Immersion in

liquids other than water

EN ISO 2812-2, Paints and varnishes — Determination of resistance to liquids — Part 2: Water immersion

method

EN ISO 4623-2, Paints and varnishes — Determination of resistance to filiform corrosion — Part 2:

Aluminium substrates

EN ISO 4628-8, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity

and size of defects, and of intensity of uniform changes in appearance — Part 8: Assessment of degree of

delamination and corrosion around a scribe or other artificial defect

EN ISO 4628-10, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity

and size of defects, and of intensity of uniform changes in appearance — Part 10: Assessment of degree of

filiform corrosion

EN ISO 9220, Metallic coatings — Measurement of coating thickness — Scanning electron microscope

method
EN ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests

EN ISO 17872, Paints and varnishes — Guidelines for the introduction of scribe marks through coatings on

metallic panels for corrosion testing
---------------------- Page: 6 ----------------------
SIST EN 4868:2019
EN 4868:2019 (E)
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:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
Mechanically Disturbed Layer
MDL

layer that is present at the surface resulting from the rolling process of the material

3.2
pit
surface corrosion defect at which the anodic coating is penetrated
Note 1 to entry: Typical characteristics of corrosion pits are:
• rounded or irregular or elongated geometry;
• comet tail or line or halo that emerges from the cavity;

• some corrosion by products inside pits (on aluminium the by-product may be granular, powdery or amorphous

and white, grey or black in colour).

To be considered as a corrosion pit, a surface cavity shall exhibit at least 2 (two) of the above characteristics.

3.3
process instruction

document that describes the application scopes, detailed process (key parameters, detailed steps, etc.),

quality management, environmental and safety regulations, etc.
3.4
rework

repetition of the anodic electrodeposition process step after complete stripping of the layer

3.5
batch

unless otherwise specified, it comprises parts of the same type (i.e. shape, size, material), processed at

the same time in the same bath
3.6
anodic electrodeposition

industrial coating method in which negatively charged organic coating particles in aqueous solution

migrate (electrophoresis) toward the anode of a direct-current electrical circuit passing through the

solution, so that electrolysis of water creates a localized pH gradient, precipitating a uniform layer of

coating on the anode
---------------------- Page: 7 ----------------------
SIST EN 4868:2019
EN 4868:2019 (E)
3.7
ultra-filtrate

effluent generated from an electrocoat bath passing across an ultrafilter membrane

Note 1 to entry: The effluent is mainly composed of water and water soluble species.

4 Purpose of process
4.1 General

This specification establishes the requirements for a waterborne, hexavalent chromium free corrosion

inhibiting, chemical and solvent resistant, anodic electrodeposition of organic coating capable of curing

at 110 °C to 120 °C.

The anodic electrodeposition process applies a protective coating with uniform film thickness control,

complete coverage of recessed areas, minimal surface defects and high transfer efficiency. Once the film

is deposited on the substrate, a thermal cure is required to achieve the final properties of the coated parts.

4.2 Applicability

It can be used as a protection against corrosion, as a painting primer before top coating application, for

electrical insulation, and as a masking before anodizing and/or conversion.
4.3 Limitations

4.3.1 All processes that can compromise the anodic electrodeposition film (e.g. forming, blasting, shot

peening, heat-treatment) shall be performed prior to surface preparation of the parts to be coated).

4.3.2 Anodic electrodeposition shall not be applied:
• in areas where electrical conductivity is required;
• for high temperature applications (> 180 °C);

• for components which can permanently entrap treatment solutions, except components that can be

adequately masked;

• for assemblies with overlap areas (e.g. spot-welded and riveted parts) containing tight tolerances that

cannot provide adequate pre-treatment and/or coating penetration between the overlap area.

5 Protection system classification
Coating layer is classified by the three following types:
• Type A: thin layer thicknesses (4 µm to 12 µm);
• Type B: medium layer thicknesses (12 µm to 30 µm);
• Type C: thick layer thicknesses (> 30 µm).
---------------------- Page: 8 ----------------------
SIST EN 4868:2019
EN 4868:2019 (E)
6 Process requirements
6.1 Information for the processor
• system type;
• substrate standard reference and heat treatment;
• areas to be coated;
• coating thickness measurement inspection points;
• electrical contact points or areas where these are inadmissible;
• specification for testing parts and/or samples.
6.2 Condition of parts prior to the treatment

All prior operations such as welding, soldering/brazing, blasting, shot peening, machining and heat

treatments shall have been completed.

• the parts shall be free of oil, grease, marking inks and other surface contaminations;

• if needed/required, mechanically disturbed layer shall be removed either by mechanical or chemical

processes;

• surface treatments prior electrodeposition process are possible. In case of anodic electrodeposition

rework, all organic coatings residues from the previous coating shall be completely removed.

6.3 Process conditions
6.3.1 Tooling

The tools, bars, electrical contact systems, and metal masking tooling shall be free of corrosion or any

other damage which may be detrimental to the treatment during use. The part racks and tools must be

designed and set up in such a manner as to:
• avoid any retention of air or treatment solution in the parts;
• facilitate neutralization and removal of solutions during rinsing operations;

• the electrical contacts shall be kept in good condition for the correct flow of the current;

• electrical contact p
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.