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GB/T 20042.3-2009 English PDF (GBT20042.3-2009)

GB/T 20042.3-2009 English PDF (GBT20042.3-2009)

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GB/T 20042.3-2009: Proton exchange membrane fuel cell -- Part 3: Test method for proton exchange membrane

This part of GB/T 20042 specifies terms and definitions, thickness uniformity test, proton conductivity test, ion exchange equivalent test, air permeability test, tensile test, swelling ratio test, water absorption tests for the proton exchange membrane test method for proton exchange membrane fuel cells. This part applies to various types of proton exchange membranes.
GB/T 20042.3-2009
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.070
K 82
Proton exchange membrane fuel cell ?€?
Part 3. Test method for proton exchange membrane
ISSUED ON. APRIL 21, 2009
IMPLEMENTED ON. NOVEMBER 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword . 3
1 Scope .. 4
2 Normative references . 4
3 Terms and definitions . 4
4 Thickness uniformity test . 5
5 Proton conductivity test . 7
6 Ion exchange equivalent weight (EW) test . 9
7 Air permeability test .. 10
8 Tensile test . 12
9 Swelling rate test . 14
10 Water absorption test .. 16
Appendix A (Informative) Test preparation . 18
Appendix B (Informative) Test report .. 19
Proton exchange membrane fuel cell ?€?
Part 3. Test method for proton exchange membrane
1 Scope
This part of GB/T 20042 specifies terms and definitions, thickness uniformity test, proton conductivity test, ion exchange equivalent test, air permeability test, tensile test, swelling ratio test, water absorption tests for the proton exchange membrane test method for proton exchange membrane fuel cells.
This part applies to various types of proton exchange membranes.
2 Normative references
The provisions in following documents become the provisions of this part through reference in GB/T 20042. For the dated references, the subsequent amendments (excluding corrections) or revisions do not apply to this Standard; however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies. GB/T 1040.3-2006 Plastics - Determination of tensile properties - Part 3. Test conditions for membranes and sheets (ISO 527-3.1995, IDT)
GB/T 1462-2005 Test methods for water absorption of fiber reinforced
plastics
GB/T 6672-2001 Plastics membrane and sheeting - Determination of
thickness by mechanical scanning (ISO 4593.1993, IDT)
GB/T 20042.1 Proton exchange membrane fuel cell - Terminology
3 Terms and definitions
The terms and definitions defined in GB/T 20042.1 and the following terms and definitions apply to this part.
3.1
Proton conductivity
4.1.1 Thickness gauge. The precision is 0.1 ??m, which is used to test the membrane thickness of the thickness 10 ??m ~ 200 ??m.
4.1.2 Caliper. The precision is 0.01 mm, which is used to test the length and width of the membrane.
4.2 Sample preparation
The sample can be square or round, with an effective area of at least 100 cm2. The sample shall be free from wrinkles, defects, or damages.
4.3 Test methods
4.3.1 PLACE the sample at a temperature of 25 ??C ?? 2 ??C and a relative
humidity of 50% ?? 5% for 12 hours.
Note. The constant temperature and humidity conditions for placing the sample can also be determined through consultation between the supplier and
purchaser.
4.3.2 Before each measurement, it shall calibrate the zero point of the thickness gauge, check the zero point again after the measurement of each specimen. 4.3.3 Slowly LOWER down the measurement head during measurement to
avoid deformation of the sample. During the test process, SELECT the strength applied by the test head onto the sample surface between 0.7 N/cm2 ~ 2 N/cm2. Note. DuPont NRE212 membrane test thickness is 53.5 ??m when the test head strength is applied to the surface of the sample is 1.75 N/cm2.
4.3.4 PERFORM test in a constant temperature and humidity environment with a temperature of 25 ??C ?? 2 ??C and a relative humidity of 50% ?? 5%. The number of test points per 100 cm2 of sample is not less than 9 and are evenly distributed, the distance from the test point to the edge of the sample shall be greater than 5 mm.
4.4 Data processing
The thickness uniformity of the sample is expressed by the difference between the maximum thickness and the minimum thickness as well as the relative thickness deviation.
4.4.1 The difference between the maximum value and the minimum value is calculated in accordance with formula (1).
Where.
5.3 Test methods
5.3.1 At the constant temperature and humidity conditions of 25 ??C ?? 2 ??C and relative humidity of 50% ?? 5%, USE the thickness gauge to measure the sample thickness, TAKE the average value of three points as the calculated thickness d value.
5.3.2 FIX the sample in the conductivity measuring pool as shown in Figure 1, USE a torque wrench to tighten the bolt at a torque of 3 N?€?m. Then PLACE the conductivity measuring pool in a constant temperature and humidity
environment with a temperature of 25 ??C ?? 2 ??C and a relative humidity of 50% ?? 5%. At the frequency range of (1 ~ 2 ?? 106) Hz and a disturbance voltage of 10 mV, USE the electrochemical impedance tester to measure the impedance spectrogram of the sample.
5.4 Data processing
In the measured impedance spectrogram, READ the impedance value (R) of
the sample from the intersection point of the high-frequency part of the spectral line with the real axis, USE the formula (4) to calculate the proton conductivity of the sample.
Where.
?? - The proton conductivity of the sample, in units of Siemens per centimeter (S/cm);
?? - Distance between two electrodes, in centimeters (cm);
R - The measured impedance of the sample, in the unit of ohm (???);
b - The effective length of the membrane in the direction perpendicular to the electrode, in centimeters (cm);
d - The thickness of the sample, in centimeters (cm).
TAKE 3 samples as a group, CALCULATE the average value as the test result. 6 Ion exchange equivalent weight (EW) test
6.1 Instruments and equipment
6.1.1 Analytical balance. The precision is 0.1 mg.
6.1.2 Automatic potentiometric titrator. pH precision is not less than 0.1. 8.1.2 Test fixture
The test fixture shall not cause the specimen to break at the fixture. When the load is applied, the longitudinal axis of the specimen shall be matched with the direction of tensioning through the center line of the fixture.
8.1.3 Thickness gauges and calipers
8.1.3.1 Thickness gauge. The precision is not less than 0.1 ??m. It is used to test the thickness of the membrane with a thickness of 10 ??m ~ 200 ??m.
8.1.3.2 Caliper. The precision is not less than 0.01 mm, which is used to test the length and width of the membrane.
8.2 Sample preparation
8.2.1 Samples shall be cut at equal intervals along two directions of the length (x-direction) and width (y-direction) of the test material, cut to a certain size of dumbbell or bar shape in accordance with GB/T 1040.3-2006. The edge of the sample shall be smooth and unnotched, the notch can be inspected with a low- magnification magnifier, the samples with defective edges can be discarded. 8.2.2 Samples are grouped in accordance with each test direction. The number of samples in each group shall meet the requirements of 3 valid tests.
8.2.3 Accurately PRINT or DRAW markings as required by the size of the
sample. This marking shall not have any effect on the sample.
8.2.4 PLACE the sample at a constant temperature and humidity of 25 ??C ?? 2 ??C and relative humidity of 50% ?? 5% for at least 4 h. Placement conditions can also be agreed by the parties involved.
8.3 Test methods
8.3.1 Under constant temperature and humidity conditions with a temperature of 25 ??C ?? 2 ??C and a relative humidity of 50% ?? 5%, MEASURE the thickness of the sample. The thickness and width of each sample shall be measured in the gauge length at three points and the average value taken. The thickness measurement precision is ?? 0.2% and the width measurement precision is ?? 0.5%.
8.3.2 PLACE the sample in the test fixture, so that the longitudinal axis of the sample coincides with the center connection line of the upper and lower fixtures, CLAMP it tightly. The pressure value of the pneumatic clamp is selected within the range of 0.3 MPa ~ 0.7 MPa.
8.3.3 The tensile speed of the testing machine is selected within the range of 50 mm/min ~ 200 mm/min.
bath, in cubic microns (??m3);
V0 - The initial volume of the sample, in cubic microns (??m3).
TAKE 3 samples as a group, CALCULATE the average value as the test result. If the difference in the swelling rate between any two samples in a group of samples exceeds 5%, it shall find the cause and make determination again. 10 Water absorption test
REFER to the method specified in GB/T 1462-2005.
10.1 Overview
This part specifies the method for the determination of the amount of water absorbed by a proton exchange membrane for fuel cells at a specified size, temperature, and immersion time.
The immersion temperatures for the two methods specified in this part are 25 ??C ?? 2 ??C and boiling water temperature 100 ??C ?? 2 ??C.
10.2 Test instruments
10.2.1 Analytical balance. The precision is 0.1 mg.
10.2.2 Oven. It can be controlled at 80 ??C ?? 2 ??C or other mutually agreed temperature.
10.2.3 Constant temperature water bath. The temperature control precision is ?? 0.2 ??C.
10.3 Sample preparation
10.3.1 CUT a square or round test material of a certain size as a sample. 10.3.2 The number of samples shall be at least 3 and shall be free from wrinkles, defects and damages.
10.4 Test methods
10.4.1 After the sample is dried in an oven at 80 ??C ?? 2 ??C for 24 h, TRANSFER it to a desiccator to cool it to room temperature. USE an analytical balance to weigh the initial mass W0 of the sample.
10.4.2 PLACE the sample in a constant temperature water bath at a given temperature for a minimum of 24 h.
Appendix A
(Informative)
Test preparation
A.1 Overview
This Appendix describes the typical items that sh...

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