ISO 8502-2:2017 PDF

Preparation of steel substrates before application of paints and related products — Tests for the assessment of surface cleanliness — Part 2: Laboratory determination of chloride on cleaned surfaces

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Title (English):

ISO 8502-2:2017

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 6
Publication date:: January 10, 2017
Edition:: ISO IS 8502 edition 3 version 1
ICS:: 25.220.10

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Description (English):

ISO 8502-2:2017 describes a method for the determination of chloride-containing salts that are readily soluble in water and are present on a steel surface. The method is also applicable to previously coated surfaces. ISO 8502-2:2017 includes a method, applicable in the field or in the laboratory, for washing off the surface while several methods are referred to for chloride analyses.

Technical details

Technical committee: ISO/TC 35/SC 12 - Preparation of steel substrates before application of paints and related products
SKU: ISO 8502-2:2017

Abstract

Overview

ISO 8502-2:2017 specifies a laboratory method to determine water‑soluble chloride contamination on steel substrates prior to painting. The standard covers a practical swabbing/wash‑off procedure (applicable in the field or laboratory) and refers to several analytical techniques for measuring chloride in the collected wash‑water. ISO 8502-2 is part of the ISO 8500 series on surface cleanliness for paint performance and corrosion control.

Key topics and requirements

Scope: Targets chloride‑containing salts that are readily soluble in water; applicable to bare and previously coated steel surfaces. It provides a wash‑off sampling technique and guidance on analytical options.
Sampling procedure:
- Mark a test area (example: ~25 000 mm² - e.g., 250 mm × 100 mm) and record the actual area.
- Use ~45 ml of high‑purity water to soak absorbent pads and thoroughly swab the area; collect washings and filter into a 50 ml volumetric flask.
- Swabbing should take at least 10 minutes and tests are carried out in duplicate.
Analytical methods (selection referenced in the standard):
- Ion chromatography (ISO 10304-1)
- Ion detection tubes (ISO 8502-5)
- Ion‑selective electrode (ISO 9517)
- Coulometric titration (informative Annex A)
- Conductivity conversion (ISO 8502-9) when non‑specific assessment is acceptable
Result expression: Calculate chloride mass per area (mg/m²) from measured chloride concentration, sample volume and test area (formula provided in Clause 7). Account for any dilutions or conditioning steps.
Limitations: Method measures only readily water‑soluble chloride removed by the wash; it does not represent total chloride trapped in crevices, pits or beneath corrosion films. Measurement uncertainty must be reported.
Reporting: Test reports must identify the surface, method used, individual and mean results, deviations, anomalies and test dates.

Applications and users

ISO 8502-2 is used to assess surface cleanliness to reduce coating failure and corrosion risks. Typical use cases:

Coating specifiers and engineers verifying pre‑treatment requirements for bridges, ships, offshore structures, storage tanks and industrial plants.
Inspection and quality control teams performing acceptance tests before painting.
Laboratory analysts selecting and validating chloride analysis methods.
Contractors and maintenance teams monitoring cleaning effectiveness and compliance with coating system requirements.

Related standards

ISO 8502-5 (ion detection tube field method)
ISO 10304-1 (ion chromatography for anions)
ISO 9517 (ion‑selective electrode method)
ISO 8502-9 (conductivity conversion)
ISO/TR 15235 (guidance on acceptable contamination levels)

Keywords: ISO 8502-2, chloride determination, surface cleanliness, steel substrates, wash-water analysis, pre-paint inspection, coating quality control, coulometric titration.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and requirements

Scope: Targets chloride‑containing salts that are readily soluble in water; applicable to bare and previously coated steel surfaces. It provides a wash‑off sampling technique and guidance on analytical options.
Sampling procedure:
- Mark a test area (example: ~25 000 mm² - e.g., 250 mm × 100 mm) and record the actual area.
- Use ~45 ml of high‑purity water to soak absorbent pads and thoroughly swab the area; collect washings and filter into a 50 ml volumetric flask.
- Swabbing should take at least 10 minutes and tests are carried out in duplicate.
Analytical methods (selection referenced in the standard):
- Ion chromatography (ISO 10304-1)
- Ion detection tubes (ISO 8502-5)
- Ion‑selective electrode (ISO 9517)
- Coulometric titration (informative Annex A)
- Conductivity conversion (ISO 8502-9) when non‑specific assessment is acceptable
Result expression: Calculate chloride mass per area (mg/m²) from measured chloride concentration, sample volume and test area (formula provided in Clause 7). Account for any dilutions or conditioning steps.
Limitations: Method measures only readily water‑soluble chloride removed by the wash; it does not represent total chloride trapped in crevices, pits or beneath corrosion films. Measurement uncertainty must be reported.
Reporting: Test reports must identify the surface, method used, individual and mean results, deviations, anomalies and test dates.

Applications and users

ISO 8502-2 is used to assess surface cleanliness to reduce coating failure and corrosion risks. Typical use cases:

Coating specifiers and engineers verifying pre‑treatment requirements for bridges, ships, offshore structures, storage tanks and industrial plants.
Inspection and quality control teams performing acceptance tests before painting.
Laboratory analysts selecting and validating chloride analysis methods.
Contractors and maintenance teams monitoring cleaning effectiveness and compliance with coating system requirements.

Related standards

ISO 8502-5 (ion detection tube field method)
ISO 10304-1 (ion chromatography for anions)
ISO 9517 (ion‑selective electrode method)
ISO 8502-9 (conductivity conversion)
ISO/TR 15235 (guidance on acceptable contamination levels)

Keywords: ISO 8502-2, chloride determination, surface cleanliness, steel substrates, wash-water analysis, pre-paint inspection, coating quality control, coulometric titration.

ISO 8502-2:2017 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and users

Related standards

Related standards

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