Determination of certain substances in electrotechnical products - Part 7-1: Hexavalent chromium - Presence of hexavalent chromium (Cr(VI)) in colorless and colored corrosion-protected coatings on metals by the colorimetric method

Published date

18-12-2015

Publisher

European Committee for Standards - Electrical

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

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.

Committee	CLC/TC 111X
DevelopmentNote	Partially supersedes EN 62321. (08/2017)
DocumentType	Standard
PublisherName	European Committee for Standards - Electrical
Status	Current
Supersedes	EN 62321:2009

Standards	Relationship
NF EN 62321-7-1 : 2017	Identical
NBN EN 62321-7-1 : 2016	Identical
NEN EN IEC 62321-7-1 : 2016	Identical
I.S. EN 62321-7-1:2015	Identical
PN EN 62321-7-1 : 2016	Identical
VDE 0042-1-7-1 : 2016	Identical
DIN EN 62321-7-1 : 2016	Identical
UNE-EN 62321-7-1:2015	Identical
BS EN 62321-7-1:2015	Identical
CEI EN 62321-7-1 : 2016	Identical
IEC 62321-7-1:2015	Identical
SN EN 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