IEC 62321-7-1
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
Organization: | IEC |
Publication Date: | 1 September 2015 |
Status: | active |
Page Count: | 42 |
ICS Code (Environmental protection): | 13.020 |
ICS Code (Electrical and electronic equipment): | 43.040.10 |
scope:
This part of IEC 62321 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
Due to its highly reactive nature, the concentration of Cr(VI)
in a corrosion-protection
The presence of Cr(VI) is determined by the mass of Cr(VI) per
surface area of the coating, in μg/cm2. This approach is
preferred since corrosion-protection
In this procedure, when Cr(VI) in a sample is detected below the 0,10 μg/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 μg/cm2 and 0,13 μg/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 μg/cm2, the sample is considered to be positive for the presence of Cr(VI) in the coating layer.