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BS EN 62321-7-1:2015

Current
Current

The latest, up-to-date edition.

Determination of certain substances in electrotechnical products Determination of the presence of hexavalent chromium (Cr(VI)) in colorless and colored corrosion-protected coatings on metals by the colorimetric method
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

01-31-2016

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms, definitions and abbreviations
4 Reagents
5 Apparatus
6 Sampling
7 Boiling water extraction procedure
8 Calibration
9 Calculation
10 Precision
11 Quality assurance and control
12 Test report
Annex A (informative) - International inter-laboratory study
        on corrosion-protected coatings - Data overview
Bibliography
Annex ZA (normative) - Normative references to
         international publications with their
        corresponding European publications

Explains a boiling water extraction procedure intended to provide a qualitative determination of the presence of hexavalent chromium (Cr(6) in colourless and coloured corrosion-protection coatings on metallic samples.

This part of IEC62321 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. Due to its highly reactive nature, the concentration of Cr(VI) in a corrosion-protection coating can change drastically with time and storage conditions. Since storage conditions prior to sample submission are not often known or provided with the samples, this procedure determines the presence of Cr(VI) based on the levels detected in the coatings at the time of testing. For testing of freshly coated samples, a minimum waiting period of 5 days (after the coating process) is necessary to ensure the coatings have stabilized. This waiting period allows potential post-process oxidation of Cr(III) to Cr(VI) to occur prior to testing. The presence of Cr(VI) is determined by the mass of Cr(VI) per surface area of the coating, in µg/cm 2. This approach is preferred since corrosion-protection coating weights are often difficult to measure accurately after production. From a coating technology perspective, the industry as a whole has transitioned to either using the non-Cr(VI) based chemistries – where little to no Cr(VI) should be present – or using the traditional Cr(VI) based chemistries – where significant levels of Cr(VI) are present and can be detected reliably. Given this industry shift, the presence or absence of Cr(VI) is often sufficient for compliance testing purposes. In this procedure, when Cr(VI) in a sample is detected below the 0,10µg/cm 2 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 0,10µg/cm 2 and 0,13µg/cm 2 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 0,13µg/cm 2, the sample is considered to be positive for the presence of Cr(VI) in the coating layer.

Committee
GEL/111
DevelopmentNote
Supersedes BS EN 62321, which remains current. Supersedes 11/30241787 DC. (02/2016)
DocumentType
Standard
Pages
24
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
EN 62321-7-1:2015 Identical
IEC 62321-7-1:2015 Identical

EN 62321-1:2013 Determination of certain substances in electrotechnical products - Part 1: Introduction and overview
EN 15205:2006 Determination of hexavalent chromium in corrosion protection layers - Qualitative analysis
ISO 648:2008 Laboratory glassware — Single-volume pipettes
DIN EN 15205:2007-02 DETERMINATION OF HEXAVALENT CHROMIUM IN CORROSION PROTECTION LAYERS - QUALITATIVE ANALYSIS
EN ISO 648:2008 Laboratory glassware - Single-volume pipettes (ISO 648:2008)
ISO 3696:1987 Water for analytical laboratory use — Specification and test methods
EN ISO 3696:1995 Water for analytical laboratory use - Specification and test methods (ISO 3696:1987)
EN 62321-2:2014 Determination of certain substances in electrotechnical products - Part 2: Disassembly, disjointment and mechanical sample preparation
EN ISO 3613:2010 Metallic and other inorganic coatings - Chromate conversion coatings on zinc, cadmium, aluminium-zinc alloys and zinc-aluminium alloys - Test methods (ISO 3613:2010)
ISO 3613:2010 Metallic and other inorganic coatings Chromate conversion coatings on zinc, cadmium, aluminium-zinc alloys and zinc-aluminium alloys Test methods
ISO 78-2:1999 Chemistry Layouts for standards Part 2: Methods of chemical analysis

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