GB/T 39560.701-2020Determination of certain substances in electrical and electronic 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 (English PDF)
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
December 14, 2020
Implementation date
July 1, 2021
Scope
GB/T 39560.701-2020 (Determination of certain substances in electrical and electronic 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) is available as an English-translated PDF.
GB/T 39560.701-2020 is the Chinese standard "Determination of certain substances in electrical and electronic 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".
Its scope clause reads: This part of GB/T 39560 specifies a boiling water extraction method whose purpose is to treat colorless and colored anticorrosive plating on metal samples: The hexavalent chromium in the layer is qualitatively determined: Due to its high activity, the content of hexavalent chromium in the anticorrosive coating will change significantly with time and storage conditions: Because of the Storage conditions are often unknown or unavailable, so the process can only be determined based on the hexavalent chromium content detected in the coating during the test: Determine its existence: When testing the newly plated samples, a waiting time of at least 5d is required (after the plating process is completed) to ensure that the plating has been After stable: The oxidation of trivalent chromium to hexavalent chromium may occur during the waiting period: The existence of hexavalent chromium is determined by the mass of hexavalent chromium contained in the unit surface area of the coating, and its unit is expressed in micrograms per square centimeter (µg/cm2) Show: This method is preferred because it is often difficult to accurately measure the quality of the anti-corrosion coating after the product is produced: From the plating technology From a point of view, the changing trend of the entire industry is to use chemicals that do not contain hexavalent chromium, that is, there is little or no hexavalent chromium: Do not use traditional chemical substances containing hexavalent chromium, that is, the content of hexavalent chromium is significant and can be reliably detected: Considering industry changes To determine whether the presence or absence of hexavalent chromium is sufficient to meet the testing purpose of regulatory compliance: In this process, if the detection of hexavalent chromium in the sample is lower than the LOQ (Limit of Quantification) of 0:10µg/cm2, it can be considered as the hexavalent chromium of the sample: Chromium is negative: Since hexavalent chromium cannot be evenly distributed in the coating even in the same batch of samples, the 0:10µg/cm2~ The "grey area" between 0:13µg/cm2 is determined as "inconclusive" to reduce the inconsistent results due to inevitable changes in the coating: fruit: In this case, additional tests may be required to confirm the presence of hexavalent chromium: When the content of hexavalent chromium is higher than At 0:13µg/cm2, the sample is considered to be positive, that is, there is hexavalent chromium in the coating:.
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Document preview — GB/T 39560.701-2020
National Standard of the People's Republic of China
- ICS
- 31.020
- Classification
- L 10
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- Preface
- 1 Scope
- 2 Normative references
- 3 Terms and definitions, abbreviations
- 4 Reagent
- 5 Equipment
- 6 Sample preparation
- 7 Boiling water extraction procedure
- 8 Calibration
- 9 Calculation
- 10 Accuracy
- 11 Quality Assurance and Control
- 12 Test report
1 Scope
This part of GB/T 39560 specifies a boiling water extraction method whose purpose is to treat colorless and colored anticorrosive plating on metal samples:
The hexavalent chromium in the layer is qualitatively determined:
Due to its high activity, the content of hexavalent chromium in the anticorrosive coating will change significantly with time and storage conditions: Because of the
Storage conditions are often unknown or unavailable, so the process can only be determined based on the hexavalent chromium content detected in the coating during the test:
Determine its existence: When testing the newly plated samples, a waiting time of at least 5d is required (after the plating process is completed) to ensure that the plating has been
After stable: The oxidation of trivalent chromium to hexavalent chromium may occur during the waiting period:
The existence of hexavalent chromium is determined by the mass of hexavalent chromium contained in the unit surface area of the coating, and its unit is expressed in micrograms per square centimeter (µg/cm2)
Show: This method is preferred because it is often difficult to accurately measure the quality of the anti-corrosion coating after the product is produced: From the plating technology
From a point of view, the changing trend of the entire industry is to use chemicals that do not contain hexavalent chromium, that is, there is little or no hexavalent chromium:
Do not use traditional chemical substances containing hexavalent chromium, that is, the content of hexavalent chromium is significant and can be reliably detected: Considering industry changes
To determine whether the presence or absence of hexavalent chromium is sufficient to meet the testing purpose of regulatory compliance:
In this process, if the detection of hexavalent chromium in the sample is lower than the LOQ (Limit of Quantification) of 0:10µg/cm2, it can be considered as the hexavalent chromium of the sample:
Chromium is negative: Since hexavalent chromium cannot be evenly distributed in the coating even in the same batch of samples, the 0:10µg/cm2~
The "grey area" between 0:13µg/cm2 is determined as "inconclusive" to reduce the inconsistent results due to inevitable changes in the coating:
fruit: In this case, additional tests may be required to confirm the presence of hexavalent chromium: When the content of hexavalent chromium is higher than
At 0:13µg/cm2, the sample is considered to be positive, that is, there is hexavalent chromium in the coating:
2 Normative references
The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article
Pieces: For undated references, the latest version (including all amendments) applies to this document:
IEC 62321-1 Determination of certain substances in electrical products Part 1: Introduction and overview (Determination of certain sub- stancesinelectrotechnicalproducts-Part 1:Introductionandoverview)
IEC 62321-2 Determination of certain substances in electrical products Part 2: Disassembly, disassembly and mechanical sample preparation (Determination of certainsubstancesinelectrotechnicalproducts-Part 2:Disassembly,disjointmentand mechanical samplepreparation)
ISO 78-2:1999 Chemical Standard Format Part 2: Chemical Analysis Methods (Chemistry-Layoutsforstand- ards-Part 2:Methodsofchemicalanslysis)
ISO 3696 Analytical laboratory water specification and test method (Waterforanalyticallaboratoryuse-Specification andtestmethods)
GB/T 40030 | GB/T 39560.4 | GB/T 39560.702 | GB/T 39560.302 | GB/T 39560.2 | GB/T 39560.12 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 25 pages — is available in the English PDF.
Referenced standards
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