NF EN ISO 8502-2
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
ISO 8502-2:2005 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. It will normally be used in a laboratory using washings sampled from surfaces on site. ISO 8502-2:2005 is applicable to the determination of salts that have been deposited on the steel surface before, during or after the cleaning operations. ISO 8502-2:2005 is not applicable to surfaces treated with chromate, nitrite or amine, which are commonly used as inhibitors in the water when wet blast-cleaning. This is because a chromate concentration of 10 mg/l or greater or a nitrite concentration of 20 mg/l or greater in the wash water interferes with the determination of the chloride. Also the amine inhibitors can form a hydroxide boundary layer (not water soluble) over the substrate and prevent the water from contacting the underlying salt for its removal. An iron(III) ion concentration of 10 mg/l also interferes with the determination, but the iron(III) ions are concentrated in the rust deposits, which are removed from the test solution by filtration.
ISO 8502-2:2005 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. It will normally be used in a laboratory using washings sampled from surfaces on site.
ISO 8502-2:2005 is applicable to the determination of salts that have been deposited on the steel surface before, during or after the cleaning operations.
ISO 8502-2:2005 is not applicable to surfaces treated with chromate, nitrite or amine, which are commonly used as inhibitors in the water when wet blast-cleaning. This is because a chromate concentration of 10 mg/l or greater or a nitrite concentration of 20 mg/l or greater in the wash water interferes with the determination of the chloride. Also the amine inhibitors can form a hydroxide boundary layer (not water soluble) over the substrate and prevent the water from contacting the underlying salt for its removal. An iron(III) ion concentration of 10 mg/l also interferes with the determination, but the iron(III) ions are concentrated in the rust deposits, which are removed from the test solution by filtration.
<p>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.</p>
- Avant-proposiv
- Introductionv
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1 Domaine d'application1
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2 Références normatives1
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3 Principe2
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4 Réactifs et matériaux2
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5 Appareillage3
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6 Mode opératoire3
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6.1 Essai à blanc3
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6.2 Nettoyage de la surface3
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6.3 Titrage des eaux de lavage4
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7 Expression des résultats4
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8 Rapport d'essai5
- Bibliographie6
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