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)

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)

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
• Publication Date: 10-Dec-2024
• ICS: 25.220.10 - Surface preparation
• Technical Committee: CEN/TC 139 - Paints and varnishes
• Drafting Committee: CEN/TC 139 - Paints and varnishes
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 11-Dec-2024
• Due Date: 06-Oct-2026
• Completion Date: 11-Dec-2024
• Ref Project: oSIST prEN 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-september-2024
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)
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: prEN ISO 8504-4
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.

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
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or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: [phone]
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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 member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
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ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee
SC 12, Preparation of steel substrates before application of paints and related products.
A list of all parts in the ISO 8504 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO 8504-4:2022(E)
Introduction
The performance of protective coatings of paint and related products applied to steel is significantly
affected by the state of the steel surface immediately prior to painting. The principal factors that are
known to influence this performance are:
— the presence of rust and mill scale;
— the presence of surface contaminants, including salts, dust, oils and greases;
— the surface profile.
The ISO 8501 series, the ISO 8502 series and the ISO 8503 series provide methods for assessing these
factors. The ISO 8504 series however provides guidance on the preparation methods that are available
for cleaning steel substrates, indicating the capabilities of each in attaining the specified levels of
cleanliness.
This document describes acid pickling, which is an effective method for surface preparation. It is widely
applicable because this method of surface preparation has a number of versatile features listed below.
a) In general, the equipment is stationary but can be mobile.
b) The method is applicable to most types and forms of steel surface, especially those that would
deform by abrasive blast-cleaning.
c) It is possible to remove rust or mill scale and non-steel metal traces from internal, external and
complex structures surfaces.
d) Acid pickling can be performed for decorative and or aesthetic purposes.
There are several items that should be included in the purchaser's procurement documents to
supplement this document. Surface imperfections should be considered before surface preparation
and coating application. The ISO 8504 series does not contain recommendations for surface cleaning of
equipment and cleaning of pipelines (such as chemical pipelines, petroleum pipelines).
The ISO 8504 series does not contain recommendations for the protective coating system to be
applied to the steel surface. The ISO 8504 series does not contain recommendations on surface
quality requirements for specific situations even though surface quality can have a direct influence
on the choice of protective coating and on its performance. Such recommendations are found in other
documents such as national standards and codes of practice. The ISO 8504 series is used to ensure that
the specified q
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