IEC 62321-7-1:2015
Determination of certain substances in electrotechnical products - Part 7-1: Hexavalent chromium - Presence of hexavalent chromium (Cr(VI)) in colourless and coloured corrosion-protected coatings on metals by the colorimetric method
Détermination de certaines substances dans les produits électrotechniques - Partie 7-1: Chrome hexavalent - Présence de chrome hexavalent (Cr(VI)) dans les revêtements incolores et colorés de protection anticorrosion appliqués sur les métaux à l'aide de la méthode colorimétrique
| Označení normy: | IEC 62321-7-1:2015 |
| Vydáno: | 2015-09-16 |
| Jazyk: | Anglicky/Francouzsky |
IEC 62321-7-1:2015
IEC 62321-7-1:2015 describes a boiling water extraction procedure intended to provide a qualitative determination of the presence of hexavalent chromium (Cr(VI)) in colourless and coloured corrosion-protection coatings on metallic samples. In this procedure, when Cr(VI) in a sample is detected below the 0,10 g;cm2 LOQ (limit of quantification), the sample is considered to be negative for Cr(VI). Since Cr(VI) may not be uniformly distributed in the coating even within the same sample batch, a ;grey zone; between 0,10 g;cm2 and 0,13 g;cm2 has been established as ;inconclusive; to reduce inconsistent results due to unavoidable coating variations. In this case, additional testing may be necessary to confirm the presence of Cr(VI). When Cr(VI) is detected above 0,13 g;cm2, the sample is considered to be positive for the presence of Cr(VI) in the coating layer. It has the status of a horizontal standard in accordance with IEC Guide 108.