ISO 8502-6-2019 Preparation of steel substrates before painting and associated products - Tests for assessment of surface cleanliness - Part 6: Extraction of water-soluble contaminants for analysis (Bresle method)

ISO 8502-6-2019 Preparation of steel substrates before painting and associated products – Tests for assessment of surface cleanliness – Part 6: Extraction of water-soluble contaminants for analysis (Bresle method)

introduction
ISO (International Organization for Standardization) is a global federation of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member group interested in a subject for which a technical committee has been established has the right to be represented on the Committee. International organizations, governments and non-governmental organizations in contact with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

Part 1 of the ISO/IEC Directive describes the procedures used to develop this document and for further maintenance. In particular, attention should be paid to the different approval criteria required for different types of ISO documents. This document has been drafted in accordance with the editorial rules of ISO/IEC Directive Part 2 (see iso.org/directives).

Please note that some elements of this document may be the subject of patent rights. ISO is not responsible for identifying any or all such patents. Details of any patent rights identified during the development of the document will be found in the introduction and/or list of ISO Patent declarations received (see iso.org/patents).

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ISO 8502-6-2019 Preparation of steel substrates before painting and associated products – Tests for assessment of surface cleanliness – Part 6: Extraction of water-soluble contaminants for analysis (Bresle method)

Explanations of the relevant standards of voluntary, ISO specific terms related to conformity assessment and the expression of meaning, and the ISO in the technical barriers to trade (TBT) adhere to the principle of the world trade organization (WTO) information, please see the iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 35, Paints and Varnishes, Sub-Committee SC 12, Preparation of Steel substrates before the application of paints and related products. In accordance with the Technical Cooperation Agreement between ISO and CEN (Vienna Agreement), cooperation with the Technical Committee of the European Committee for Standardization (CEN), CEN/TC 139, Paints and varnishes.

The third edition cancels and replaces the second edition (ISO 8502-6:2006), which has been technically revised.

The main changes compared with the previous edition are as follows:

– Includes a telescopic extraction unit for water extraction;

– The specification uses only water as the solvent for this method.

A list of all the parts in the ISO 8502 series can be found on the ISO website.

Any feedback or questions on this document should be referred to the user’s national standards body. A complete list of these institutions can be found at iso.org/members.html.

introduce
The performance of protective coatings applied to steel paints and related products is significantly affected by the state of the steel surface prior to coating. The main factors known to affect this performance are:

a) The presence of rust and oxide;

b) the presence of surface contaminants, including salt, dust, oil and grease;

c) Surface profile.

ISO 8501 series, ISO 8502 series, and ISO 8503 series are ready to provide methods for assessing these factors, while ISO 8504 series provides guidelines for preparation methods that can be used to clean steel substrates, indicating the cleanliness of each method’s ability to achieve a specified level.

These international standard series do not contain recommendations for protective coating systems for steel surfaces. They also do not contain recommendations for surface quality requirements for specific situations, even though surface quality can directly affect the choice of protective coating to be applied and its performance. Such recommendations can be found in other documents, such as national standards and codes of practice. Users of these international standards should ensure that the required quality is:

– Compatible and appropriate with the environmental conditions to which the steel will be exposed and the protective coating system to be used;

– Within the capacity of the prescribed cleaning procedures.

The above four series of international standards cover the following aspects of steel substrate preparation:

ISO 8501 covers visual assessment of surface cleanliness;

– ISO 8502 covers surface cleanliness assessment tests;

– ISO 8503 covers the surface roughness characteristics of sandblasted steel substrates;

ISO 8504 covers surface treatment methods.

This document is one of many parts of ISO 8502 that specify tests to be used to assess surface cleanliness. For such tests, there are several ways to extract and analyze soluble contaminants on the surface to be painted. One of these methods is based on wipes of relatively large test surfaces. This technique provides an average of the pollutants present, but it may hide local concentrations of pollutants. In addition, wipes may not ensure sufficient penetration to dissolve all deep contaminants, such as ferrite.

However, there are other methods that use small cells as liquids used to remove and collect surface contaminants. The cells attach to test surfaces where soluble contaminants may be present, such as where pitting occurs, and prevent evaporation loss of the extraction solution. This closed-cell technique often provides more accurate contaminant point values.

The paper describes a simple, inexpensive field test using a flexible battery designed to be in the form of a bonded battery filled with water. The method was originally developed by Swedish scientist A. Bresle beau ± ± using one of the cell types included in this document.

1 Scope of Application

This document details a method for extracting water-soluble contaminants from surfaces by using a flexible battery in the form of a patch or sleeve that can be affixed to any surface regardless of its shape (flat or curved) and orientation (facing in any direction, including downward).

The method described is suitable for field use to determine the presence of water-soluble contaminants prior to painting or similar treatment.

This document does not include a follow-up analysis of dissolved contaminants. Analytical methods suitable for field use are described in other parts of ISO 8502.

Note: Extraction methods may produce false negatives or fail to remove all water soluble substances from the surface for the following reasons: a) soluble substances are hidden in crevices or under metal folds; b) Corrosion layer, passivation layer produced by corrosion inhibitor, oil, grease or other soluble material under invisible film.

2 Normative reference documents
When the following documents are referenced in the text, some or all of them constitute the requirements of this document. For dated references, only the cited version applies. For undated citations, a new version of the referenced document (including any revisions) applies.

ISO 554, Standard Atmospheric specification for conditioning and/or testing

ISO 3696, Analytical laboratory water use – specifications and test methods

ISO 8501-1, Preparation of steel substrates before painting and related products – Visual assessment of surface cleanliness – Part 1: Grade of corrosion and readiness of uncoated steel substrates and of steel substrates after removal of previous coatings in their entirety

ISO 8502-9, Preparation of steel substrates before painting and related products – Tests for assessment of surface cleanliness – Part 9: Field method for determination of conductivity of water-soluble salts

ISO 8503-2, Preparation of steel substrates before painting and related products – Surface roughness characteristics of sandblasted steel substrates – Part 2: Method for grading the surface profiles of abrasive sandblasted steel – Comparison procedure

3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminology databases for standardization at the following addresses:

– ISO online browsing platform: iso.org/obp

– IEC Electropedia: available at electropedia.org

Only the standard information section is public. To see the full content, you need to purchase the standard through the official channels.

ISO 8502-6-2019 Preparation of steel substrates before painting and associated products – Tests for assessment of surface cleanliness – Part 6: Extraction of water-soluble contaminants for analysis (Bresle method)

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