ISO 8502-9:2020 PDF

Preparation of steel substrates before application of paints and related products — Tests for the assessment of surface cleanliness — Part 9: Field method for the conductometric determination of water-soluble salts

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Title (English):

ISO 8502-9:2020

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 7
Publication date:: August 7, 2020
Edition:: ISO IS 8502 edition 2 version 1
ICS:: 25.220.10

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Description (English):

This document specifies a field method for the assessment of the surface density of various water-soluble salts on steel surfaces, before and/or after surface preparation, by conductometric determination. The individual surface densities of the salt composition like chlorides, sulphates, sodium, etc, cannot be determined by this method. This method assesses only contaminants that forms an electrolyte (ions) when in contact with water. These represent the greater part of the contaminants.

Technical details

Technical committee: ISO/TC 35/SC 12 - Preparation of steel substrates before application of paints and related products
SKU: ISO 8502-9:2020

Abstract

Overview

ISO 8502-9:2020 specifies a field method for conductometric determination of water‑soluble salts on steel surfaces prior to painting. The standard uses an adhesive extraction cell (as in the Bresle method, ISO 8502-6) and a conductometer to assess the total surface density of soluble ionic contaminants (reported as total soluble salts). It is a rapid, on‑site test for salts that form electrolytes in water - the majority of corrosion‑promoting contaminants - but it does not identify individual ions (e.g., chloride, sulphate, sodium).

Key topics and technical requirements

Principle: dissolve salts from a defined surface area with water in an adhesive cell, measure solution conductivity, and calculate total soluble salts using the method’s empirical conversion.
Sampling: uses adhesive cells and sampling procedures referenced in ISO 8502-6 (Bresle patch). Record sampling area and volumes.
Instrumentation:
- Conductometer with temperature compensation to 25 °C.
- Specified conductivity ranges and resolutions (e.g., 0–20 mS/m (0–200 µS/cm) at 0.01 mS/m resolution and 20–200 mS/m at 0.1 mS/m; accuracy ~2%).
- Beaker and syringe (if used) for sample handling.
Water quality: solvent water of at least ISO 3696 grade 3 (typically

Related standards

Mentioned in the description and other ISO standards

Overview

Key topics and technical requirements

Principle: dissolve salts from a defined surface area with water in an adhesive cell, measure solution conductivity, and calculate total soluble salts using the method’s empirical conversion.
Sampling: uses adhesive cells and sampling procedures referenced in ISO 8502-6 (Bresle patch). Record sampling area and volumes.
Instrumentation:
- Conductometer with temperature compensation to 25 °C.
- Specified conductivity ranges and resolutions (e.g., 0–20 mS/m (0–200 µS/cm) at 0.01 mS/m resolution and 20–200 mS/m at 0.1 mS/m; accuracy ~2%).
- Beaker and syringe (if used) for sample handling.
Water quality: solvent water of at least ISO 3696 grade 3 (typically

ISO 8502-9:2020 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

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