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.

International standards are drafted in accordance with the rules given in Part 2 of the ISO/IEC Directive.

The main task of the technical committee is to develop international standards. The draft international standard adopted by the Technical Committee will be circulated to the member bodies for voting. Publication as an international standard requires approval by a vote of at least 75% of the member bodies.

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.

ISO 8502-11-2006 Preparation of steel substrates before painting and associated products – Test for assessment of surface cleanliness – Part 11: Field method for determination of water soluble sulfate by turbidimetry

ISO 8502-11 was developed by Technical Committee ISO/TC 35, Paints and Varnishes, Sub-Committee SC 12, Preparation of steel substrates prior to the application of paints and related products.

ISO 8502 consists of the following parts, under the general heading Preparation of steel substrates prior to painting and associated products – Surface cleanliness assessment tests:

– Part 2: Laboratory determination of chlorides on clean surfaces

– Part 3: Assessment of dust on the surface of steel to be painted (pressure sensitive tape method)

– Part 4: Guidelines for estimating condensation probability before painting

– Part 5: Determination of chlorides on coated steel surfaces (ion tube method)

– Part 6: Extraction of soluble contaminants for analysis – Bresle method

– Part 8: Field method for determination of moisture refraction

– Part 9: Field method for determination of conductance of water-soluble salts

– Part 11: Field method for determination of water-soluble sulfate by turbidimetry

– Part 12: Field method for titration of water-soluble ferrous ions

Parts 1 and 10 have been withdrawn. As Part 7, field methods for determining oils and greases are being considered.

ISO 8502-11-2006 Preparation of steel substrates before painting and associated products – Test for assessment of surface cleanliness – Part 11: Field method for determination of water soluble sulfate by turbidimetry

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.

International standards ISO 8501, ISO 8502 and ISO 8503 are ready to provide methods for assessing these factors, while ISO 8504 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.

ISO 8502-11-2006 Preparation of steel substrates before painting and associated products – Test for assessment of surface cleanliness – Part 11: Field method for determination of water soluble sulfate by turbidimetry

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

ISO 8501 – Visual assessment of surface cleanliness

ISO 8502 – Surface cleanliness assessment test

ISO 8503 – Surface roughness characteristics of sandblasting steel substrates;

ISO 8504 – Surface treatment methods.

Each of these international standards is divided into separate sections.

There are a variety of methods that can be used to analyze sulfate in solution. However, most of these are used in laboratories and few are suitable for field use, i.e. in combination with sampling in workshops, construction sites, ships, etc., which are often under harsh environmental conditions.

This in situ method for sulfates, as well as corresponding analytical methods developed for other contaminants such as ferrous ions, chlorides, oils and greases, are intended to be used in conjunction with the Bresle method to remove contaminated surfaces, ISO 8502-6. These analytical methods provide results that directly represent the amount of contaminants per unit surface area, usually expressed in mg/m 2, after the application of a simple conversion factor. The same analytical method can also be used in conjunction with other contaminant extraction methods.

ISO 8502-11-2006 Preparation of steel substrates before painting and associated products – Test for assessment of surface cleanliness – Part 11: Field method for determination of water soluble sulfate by turbidimetry

1 Scope of Application
This part of ISO 8502 describes an on-site method for assessing the surface density of water-soluble sulfate on steel surfaces before and/or after surface treatment.

2 Normative reference documents
The following reference files are required for the application 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 3696:1987, Analytical laboratory water use – Specifications and test methods

ISO 8502-6:2006, Preparation of steel substrates before painting and related products – Tests for assessment of surface cleanliness – Part 6: Extraction of soluble contaminants for analysis – Bresle method

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