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.

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.

The international standard ISO 8502-5 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:

ISO 8502-5-1998 Preparation of steel substrates before painting and related products – Test for assessment of surface cleanliness – Part 5: Measurement of chlorides on steel surfaces ready for painting (ion tube method)

– Part 1: Field tests of soluble iron corrosion products [Technical report]

– Part 2: Laboratory determination of chlorides on clean surfaces

– Part 3: Assessment of dust on the surface of steel prepared for coating (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 10: Field method for titration of chlorides

Other parts are being planned.

ISO 8502-5-1998 Preparation of steel substrates before painting and related products – Test for assessment of surface cleanliness – Part 5: Measurement of chlorides on steel surfaces ready for painting (ion tube method)

1 Scope of Application
This part of ISO 8502 describes field tests using special detection tubes to measure chloride ions.

With suitable surface sampling techniques, the test applies to steel surfaces before and after cleaning, as well as painted surfaces between coats.

ISO 8502-2, Preparation of steel substrates before painting and related products – Tests for assessment of surface cleanliness – Part 2: Laboratory determination of chlorides on clean surfaces – Laboratory method for determination of chlorides on surfaces is described.

2 Normative reference documents
The following standards contain provisions which, by reference herein, constitute the provisions of this part of ISO 8502. At the time of publication, the specified version is valid. All standards are subject to revision and parties to agreements based on this part of ISO 8502 are encouraged to investigate the possibility of applying the new version of the standard described below. IEC and ISO members maintain a register of currently valid international standards.

ISO 3696:1987, Analytical laboratory water use – Specifications and test methods.

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