ISO 8502-15-2020 Preparation of steel substrates before painting and related products - Tests for assessment of surface cleanliness - Part 15: Extraction of soluble contaminants by acid extraction for analysis

ISO 8502-15-2020 Preparation of steel substrates before painting and related products – Tests for assessment of surface cleanliness – Part 15: Extraction of soluble contaminants by acid extraction for analysis

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 8502-15-2020 Preparation of steel substrates before painting and related products – Tests for assessment of surface cleanliness – Part 15: Extraction of soluble contaminants by acid extraction for analysis

For an explanation of the voluntary nature of the standard, the meaning of ISO-specific terms and expressions related to conformity assessment, and information on ISO’s compliance with World Trade Organization (WTO) principles in Technical Barriers to Trade (TBT), see

Iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 35, Paints and Varnishes, Sub-Committee SC 12, Preparing steel substrates prior to the application of paints and related products.

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.

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

These international standards 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 need to ensure that the specified 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:

Visual assessment of surface cleanliness (see ISO 8501 series);

– Surface cleanliness assessment test (see ISO 8502 series);

– Sand blasting to clean the surface roughness characteristics of steel substrates (see ISO 8503 series);

– Surface treatment method (see ISO 8504 series).

Each of these series of international standards is divided into separate sections.

This document, together with other parts of the ISO 8502 series, specifies tests for surface cleanliness assessment. Related to such tests, there are several methods for extracting and analyzing soluble contaminants on surfaces to be painted. Some of these methods are 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. Wipes may not ensure sufficient penetration to dissolve all deep contaminants, such as ferrite. In addition, the solvent used will affect the dissolution rate and dissolved contaminants. This document covers sampling with weak acids as solvents.

However, there are other methods that use small cells as liquids to remove and collect surface contaminants. The battery (rigid or flexible) is attached to the test surface where soluble contaminants may be present, such as where pitting occurs. This technique often provides more accurate contaminant point values.

1 Scope of Application
This document specifies a method for extracting surface acid-soluble contaminants for analysis 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 acid-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 (e.g. ISO 8502-5).

This document is procedurally similar to but not equivalent to ISO 8502-6. The main difference lies in the solvent used and the subsequent analysis that can be performed on the extracted solution.

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 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 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

ISO/IEC 17025, General requirements for testing and calibration laboratory competence

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 8502-15-2020 Preparation of steel substrates before painting and related products – Tests for assessment of surface cleanliness – Part 15: Extraction of soluble contaminants by acid extraction for analysis

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