SIST EN ISO 8504-4:2025

Preparation of steel substrates before application of paints and related products - Surface preparation methods - Part 4: Acid pickling (ISO 8504-4:2022)

This document describes the typical method for acid pickling generally used in a shop facility for the preparation of steel substrates before application of paints and related products. It is in general applicable to new steelwork.
This method is essentially intended to remove rust and mill scale. Typically, only slight oil residues can be removed during this process. It can be used on steel surfaces that are easily deformed by abrasive blasting.

Vorbereitung von Stahloberflächen vor dem Auftragen von Beschichtungsstoffen - Verfahren für die Oberflächenvorbereitung - Teil 4: Säurebeizung (ISO 8504-4:2022)

Dieses Dokument beschreibt das gängige Verfahren zum Säurebeizen, das in einer Betriebsanlage zur Vorbereitung von Stahloberflächen vor dem Auftragen von Beschichtungsstoffen üblicherweise angewendet wird. Es wird im Allgemeinen bei neuen Stahlkonstruktionen angewendet.
Dieses Verfahren dient im Wesentlichen der Entfernung von Rost und Walzhaut. In der Regel können mit diesem Verfahren nur leichte Ölrückstände entfernt werden. Es kann auf Stahloberflächen verwendet werden, die sich durch Strahlen leicht verformen.
WARNUNG — Die in diesem Dokument beschriebenen Verfahren sind von entsprechend geschultem und/oder beaufsichtigtem Personal durchzuführen. Die für diese Verfahren verwendeten Substanzen und Arbeitsschritte können gesundheitsgefährdend sein, wenn keine angemessenen Vorsichtsmaßnahmen getroffen werden. In diesem Text wird auf einige spezielle Gefährdungen hingewiesen. Dieses Dokument bezieht sich ausschließlich auf die technische Eignung der Verfahren und entbindet den Anwender nicht von rechtlichen Verpflichtungen hinsichtlich Arbeits- und Gesundheitsschutz.

Préparation des subjectiles d'acier avant application de peintures et de produits assimilés - Méthodes de préparation des subjectiles - Partie 4: Décapage à l'acide (ISO 8504-4:2022)

Le présent document décrit la méthode habituelle de décapage à l’acide généralement utilisée en atelier pour la préparation des subjectiles d’acier avant application de peintures et de produits assimilés. Elle est en général applicable à l’acier neuf.
Cette méthode est essentiellement destinée à éliminer la rouille et la calamine. En général, il n’est possible d’éliminer qu’une infime quantité de résidus d’huile durant ce processus. Elle peut être utilisée sur les subjectiles d’acier qui se déforment facilement lorsqu’ils sont préparés par projection d’abrasif.

Priprava jeklenih podlag pred nanašanjem barv in sorodnih premazov - Postopki priprave površine - 4. del: Obdelava s kislino (ISO 8504-4:2022)

General Information

• Status: Published
• Public Enquiry End Date: 01-Oct-2024
• Publication Date: 14-Jan-2025
• ICS: 25.220.10 - Surface preparation
• ICS: 87.020 - Paint coating processes
• Technical Committee: IBLP - Paints and varnishes
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 08-Jan-2025
• Due Date: 15-Mar-2025
• Completion Date: 15-Jan-2025
• Ref Project: EN ISO 8504-4:2024 - Preparation of steel substrates before application of paints and related products - Surface preparation methods - Part 4: Acid pickling (ISO 8504-4:2022)

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2025
Priprava jeklenih podlag pred nanašanjem barv in sorodnih premazov - Postopki
priprave površine - 4. del: Obdelava s kislino (ISO 8504-4:2022)
Preparation of steel substrates before application of paints and related products -
Surface preparation methods - Part 4: Acid pickling (ISO 8504-4:2022)
Vorbereitung von Stahloberflächen vor dem Auftragen von Beschichtungsstoffen -
Verfahren für die Oberflächenvorbereitung - Teil 4: Säurebeizung (ISO 8504-4:2022)
Préparation des subjectiles d'acier avant application de peintures et de produits
assimilés - Méthodes de préparation des subjectiles - Partie 4: Décapage à l'acide (ISO
8504-4:2022)
Ta slovenski standard je istoveten z: EN ISO 8504-4:2024
ICS:
25.220.10 Priprava površine Surface preparation
87.020 Postopki za nanašanje Paint coating processes
barvnih premazov
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 8504-4
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2024
EUROPÄISCHE NORM
ICS 25.220.10
English Version
Preparation of steel substrates before application of paints
and related products - Surface preparation methods - Part
4: Acid pickling (ISO 8504-4:2022)
Préparation des subjectiles d'acier avant application de Vorbereitung von Stahloberflächen vor dem Auftragen
peintures et de produits assimilés - Méthodes de von Beschichtungsstoffen - Verfahren für die
préparation des subjectiles - Partie 4: Décapage à Oberflächenvorbereitung - Teil 4: Säurebeizung (ISO
l'acide (ISO 8504-4:2022) 8504-4:2022)
This European Standard was approved by CEN on 8 December 2024.

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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8504-4:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 8504-4:2022 has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes” of the International Organization for Standardization (ISO) and has been taken over as
which is held by DIN.
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 June 2025, and conflicting national standards shall be
withdrawn at the latest by June 2025.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 8504-4:2022 has been approved by CEN as EN ISO 8504-4:2024 without any
modification.
INTERNATIONAL ISO
STANDARD 8504-4
First edition
2022-08
Preparation of steel substrates before
application of paints and related
products — Surface preparation
methods —
Part 4:
Acid pickling
Préparation des subjectiles d'acier avant application de peintures et
de produits assimilés — Méthodes de préparation des subjectiles —
Partie 4: Décapage à l'acide
Reference number
ISO 8504-4:2022(E)
ISO 8504-4:2022(E)
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 8504-4:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 S c op e . 1
2 Nor m at i ve r ef er enc e s . 1
3 Terms and definitions . 1
4 G ener a l . 2
4.1 P ickling liquid . 2
4.1.1 Requirements to the chemical materials . 2
4.1.2 Requirements to the formulation and process conditions of a pickling liquid . 2
4.1.3 Example of formulation and process conditions of a pickling liquid . 2
4.2 General requirements . 2
4.2.1 R equirements to the bath equipment materials . 2
4.2.2 R equirements to the bath analysis . 2
4.3 H ealth and safety . . 2
5 M ethod of acid pickling . 3
5.1 P rocedure for acid pickling . 3
5 . 2 P r ep a r at ion . 3
5 . 3 D e g r e a s i ng. 3
5.3.1 Components and conditions . 3
5 . 3 . 2 I m mer s ion me t ho d . 4
5 . 3 . 3 P a r t pl ac ement . 4
5 . 3 .4 I m mer s ion t i me . 4
5 . 3 . 5 P r o c e s s t emp er at u r e . 4
5.4 F resh water rinsing and/or washing . 4
5.4.1 F resh water rinsing process. 4
5.4.2 R insing water temperature . 4
5.4.3 Fresh water washing process . 4
5 . 5 P ic k l in g . 4
5.5.1 I mmersion requirement . . . 4
5 . 5 . 2 P a r t placement . 4
5 . 5 . 3 I m mer s ion t i me . 4
5 . 5 .4 P r o c e s s t emp er at u r e . 4
5 . 6 Po s t t r e at ment . 5
5.6.1 C onversion layer . 5
5 . 6 . 2 Su r f ac e neut r a l i z at ion . 5
5.6.3 Improvement of the phosphate layer . 5
5.6.4 Q uality check and assurance . 5
5.6.5 Drying . 5
6 A ssessment of cleaned surface . 5
Annex A (informative) Formulation and condition of common process liquids .6
Bibliography . 8
iii
ISO 8504-4:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each me
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