GB/T 20042.6-2024 English PDF (GBT20042.6-2024)

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GB/T 20042.6-2024: Proton exchange membrane fuel cell -- Part 6: Test method of bipolar plate properties
GB/T 20042.6-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.070
CCS K 82
Replacing GB/T 20042.6-2011
Proton Exchange Membrane Fuel Cell – Part 6.Test Method
of Bipolar Plate Properties
ISSUED ON. MARCH 15, 2024
IMPLEMENTED ON. OCTOBER 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
Introduction... 6
1 Scope... 7
2 Normative References... 7
3 Terms and Definitions... 8
4 Flexural Strength Test of Bipolar Plate Materials... 9
5 Density Test of Bipolar Plate Materials... 11
6 Resistance Test of Bipolar Plate Material... 12
7 Corrosion Current Density Test of Bipolar Plate Materials... 16
8 Area Utilization Rate Test of Bipolar Plate Component... 20
9 Thickness Uniformity Test of Bipolar Plate Component... 21
10 Groove Depth Uniformity Test of Bipolar Plate Component... 24
11 Flatness Test of Bipolar Plate Components... 26
12 Relative Flatness Test of Bipolar Plate Component... 27
13 Contact Resistance Test of Bipolar Plate Component... 29
14 Air Tightness Test of Bipolar Plate Component... 29
15 Water Contact Angle Test of Bipolar Plate Component... 33
16 Coating Thickness Test of Bipolar Plate Component... 34
17 Coating Bonding Strength Test of Bipolar Plate Component... 35
18 Corrosion Current Density Test of Bipolar Plate Component... 36
19 Specific Heat Capacity Test of Bipolar Plate Component... 37
20 Thermal Conductivity Test of Bipolar Plate Component... 38
21 Precipitation Ion Composition and Concentration Test for Bipolar Plate Component
... 39
22 Applicability of Test Indicators, Test Preparation and Test Report... 41
Appendix A (Normative) Applicability of Test Indicators... 42
Appendix B (Informative) Test Preparation... 43
Appendix C (Informative) Test Report... 44
Bibliography... 47
Proton Exchange Membrane Fuel Cell – Part 6.Test Method
of Bipolar Plate Properties
1 Scope
This Document specifies the test methods for the flexural strength, density, resistance and
corrosion current density, etc. of bipolar plate materials for proton exchange membrane fuel
cells; and the test methods for the area utilization, thickness uniformity, groove depth uniformity,
flatness, relative flatness, contact resistance, air tightness, etc. of bipolar plate components.
This Document is applicable to various types of bipolar plate materials and components for
proton exchange membrane fuel cells.
NOTE. The definitions of bipolar plate materials and bipolar plate components are as follows.
a) Bipolar plate material. Plate material in the same state as the finished bipolar plate material;
b) Bipolar plate component. Finished bipolar plate in the same state as the used state.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 230.2 Metallic materials – Rockwell hardness test – Part 2.Verification and
calibration of testing machines and indenters
GB/T 1958 Geometrical product Specifications (GPS) - Geometrical tolerance -
Verification prescription
GB/T 4472-2011 Determination of density and relative density for chemical products
GB/T 13465.2 Test method of impermeable graphite materials - Part 2.Flexure strength
GB/T 19466.4-2016 Plastics - Differential scanning calorimetry (DSC) - Part 4.
Determination of specific heat capacity
GB/T 20042.1-2017 Proton exchange membrane fuel cell - Part 1.Terminology
Take 3 valid samples as a group; calculate the average value as the test result, and retain two
digits after the decimal point.
6 Resistance Test of Bipolar Plate Material
6.1 Test instrument
The test instrument includes the following equipment and tools.
--- Four-probe low resistance measuring instrument. accuracy is 0.1mΩ·cm;
--- Thickness gauge. accuracy is 1μm, used to measure the thickness of the sample;
--- Low resistance measuring instrument. DC mode, accuracy is 0.01mΩ; the pressure
device accuracy meets the requirements of Level-0.5.
6.2 Preparation of sample
6.2.1 The sample shape is square (5cm×5cm) and the area is 25cm2; the sample shape and size
can also be negotiated by the test parties.
6.2.2 The number of samples is 5 (ensure 3 valid values to be obtained); and there shall be no
wrinkles, scratches or damage.
6.2.3 For samples from different batches, they should be sampled separately.
6.3 Test methods
6.3.1 In-plane resistivity test
6.3.1.1 The zero point of the tester shall be calibrated before each test. The influence of sample
deformation, dust on the sample surface and other factors shall be avoided during the test.
6.3.1.2 Use a four-probe low-resistance meter to test at least 5 locations near the edge and center
of the sample; and record the in-plane resistivity values of different locations.
6.3.2 Through-plane resistivity test
6.3.2.1 Use a low-resistance meter to test the resistance value; and the test electrode is a gold-
plated copper electrode. The connection method between the gold-plated copper electrode and
the wire is determined by negotiation between the two test parties to minimize the influence of
the low-resistance meter on the test results.
6.3.2.2 Use a thickness gauge to measure the sample thickness; and the measurement positions
shall be no less than 3.
6.3.2.3 Install the sample on the test device as shown in Figure 1.During the test, place
5cm×5cm carbon paper on both sides of the sample as a support to further improve the contact
condition. During the test, record a resistance value for every 0.1MPa increase in pressure until
the change rate of the current resistance test value relative to the previous resistance test value
is ≤5%, then it is considered that the minimum resistance value has been reached and the test
is stopped. The resistance value under different pressures is recorded as Rm.
6.3.2.4 Use new carbon paper of the same specification for each test, and the carbon paper
manufacturer and model shall be indicated in the test report.
NOTE. The test current density is 40mA/cm2 or determined by negotiation between the two test parties.
The test pressure range is generally 0.1MPa~2.0MPa; and the resistance value at a pressure of 1.5MPa
is selected, or it is determined by negotiation between the two test parties.
6.3.3 Contact resistance test
6.3.3.1 Use a low resistance meter to test the resistance value; and the test electrode is a gold-
plated copper electrode. The connection method between the gold-plated copper electrode and
the wire is determined by negotiation between the two test parties to minimize the impact of
the low resistance meter on the test results.
6.3.3.2 Install the sample on the test device as shown in Figure 1.During the test, place
5cm×5cm carbon paper on both sides of the sample as a support to further improve the contact
condition. During the test, record a resistance value for each 0.1MPa increase in pressure until
the change rate of the current resistance test value relative to the previous resistance test value
is ≤5%; then it is considered that the minimum resistance value is reached and the test is stopped.
The resistance value under different pressures is recorded as R1....