GB/T 20042.6-2024 PDF EnglishUS$550.00 · In stock · Download in 9 seconds
GB/T 20042.6-2024: Proton exchange membrane fuel cell - Part 6: Test method of bipolar plate properties Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 20042.6: Historical versions
Similar standardsGB/T 20042.6-2024: Proton exchange membrane fuel cell - Part 6: Test method of bipolar plate properties---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT20042.6-2024 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 ContentsForeword... 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... 471 ScopeThis 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 ReferencesThe 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 GB/T 20428-2006 Granite surface plates GB/T 22588-2008 Determination of thermal diffusivity or thermal conductivity by the flash method GB/T 28634 Microbeam analysis - Electron probe microanalysis - Quantitative point analysis for bulk specimen using wavelength dispersive X-ray spectroscopy3 Terms and DefinitionsFor the purposes of this Document, the terms and definitions given in GB/T 20042.1-2017 and the following apply. 3.1 Corrosion current density The current value that is generated by the electrochemical damage caused by the corrosion potential on the surface of the bipolar plate material or component per unit area in the simulated fuel cell operating environment. 3.2 Interfacial contact resistance The resistance that is generated by the contact between the two material detection areas. 3.3 Through-plane resistivity The resistivity value of the bipolar plate material in the direction perpendicular to the plate surface. NOTE. The unit of through-plane resistivity is milliohm centimeters (mΩ·cm). 3.4 In-plane resistivity The resistivity value of the bipolar plate material in the direction parallel to the plate surface. Note. The unit of in-plane resistivity is milliohm centimeters (mΩ·cm). 3.5 Flexural strength The maximum bending stress that a bipolar plate can withstand during bending under specified conditions. 3.6 Flatness The sum of the distances from the highest peak and the lowest valley on the surface of the measured part of the bipolar plate to the fitting plane under the specified pressure.4 Flexural Strength Test of Bipolar Plate Materials4.1 Test instruments The test instruments include the following equipment and tools. 4.2 Preparation of the sample 4.2.1 The width of the sample is 25mm±0.5mm and the length is 60mm±1mm. The sample size can also be determined by negotiation between the two parties. The deviation between the thickness of the sample on each part and the average thickness should not exceed 2%; and the deviation between the width and the average width shall not exceed 3%. The cross section of the sample shall be rectangular and without chamfers. 4.2.2 The number of samples is 5 (ensure 3 valid values to be obtained); and there shall be no wrinkles, scratches or damage. 4.2.3 For samples from different batches, they shall be sampled separately. 4.3 Test methods 4.3.1 Measure the width and thickness 3 times along the length of the sample; and take the average value respectively. 4.3.2 Adjust the support span to 40mm±0.3mm; place the prepared sample symmetrically on the two supports; and make the test machine pressure head and support axis perpendicular to the sample; and test the sample bending strength using the three-point bending method in accordance with GB/T 13465.2. 4.3.3 The pressure head applies load to the sample uniformly at a loading speed of 1 mm/min until the sample breaks; and the breaking load value is read. 4.4 Data processing The flexural strength of the sample is calculated according to Formula (1).5 Density Test of Bipolar Plate Materials5.1 Test instrument The test instrument includes the following equipment and tools. 5.2 Preparation of sample 5.2.1 The sample shape is square (5cm×5cm) and the area is 25cm2; the sample shape and size can also be negotiated by both parties to the test. 5.2.2 Clean the sample surface with ethanol or other solvents and dry it. 5.2.3 Remove grease from the metal wire. 5.3 Test methods The test is carried out according to the method specified in 4.2.3 of GB/T 4472-2011 for hydrostatic weighing method. 5.4 Data processing The density data of the sample is processed according to the method specified in 4.2.3.4 of GB/T 4472-2011.6 Resistance Test of Bipolar Plate Material6.1 Test instrument The test instrument includes the following equipment and tools. 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. 6.3.2 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. 6.3.3 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. 6.3.3.4 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. 6.4 Data processing 6.4.1 The in-plane resistivity of the sample is calculated according to Formula (2). 6.4.2 The through-plane resistivity of the sample is calculated according to Formulas (3) and (4). 6.4.3 The contact resistance of the sample is calculated according to Formula (5).7 Corrosion Current Density Test of Bipolar Plate Materials7.1 Test instrument The test instrument includes the following equipment and tools. 7.2 Preparation of sample 7.2.1 Cut the test material of a certain size as the sample, and ensure that the effective area of the sample is at least 1cm2. 7.2.2 Clean the sample surface with ethanol or other solvents; and dry it in a nitrogen environment at 80℃ for 10min. 7.2.3 Seal the sample according to the opening shape on the side of the electrolytic cell to ensure that there is no leakage during the test. 7.2.4 The number of samples is 5 (ensure 3 valid values to be obtained); and there shall be no wrinkles, scratches or damage. 7.2.5 For samples from different batches, they should be sampled separately. 7.3 Test methods 7.3.1 Open circuit potential test 7.3.2 Dynamic potential test 7.3.3 Constant potential test 7.3.3.1 Test with the sample as the working electrode, the saturated calomel electrode as the reference electrode, and the platinum sheet or platinum mesh as the auxiliary electrode. The reference electrode type can also be determined by negotiation between the two test parties; and the test potential is converted accordingly according to the used reference electrode type. 7.4 Data processing The corrosion current density of the sample is calculated according to Formula (6).8 Area Utilization Rate Test of Bipolar Plate Component8.1 Test instrument The test instrument includes a contour measuring instrument with an accuracy of 5μm. 8.2 Preparation of Sample 8.2.1 The sample is a complete bipolar plate with the number of 5 (ensure 3 valid values to be obtained); and there shall be no wrinkles, scratches or damage. 8.2.2 For samples from different batches, they should be sampled separately. 8.3 Test methods 8.3.1 Test at 25℃±2℃. 8.3.2 Use a transparent plate to apply a certain pressure to flatten the sample. The size of the transparent plate is larger than the sample size. The material, thickness and pressure of the transparent plate are determined by negotiation between the two test parties. 8.3.5 The membrane electrode manufacturer and model shall be indicated in the test report. 8.4 Data processing The area utilization rate of the sample is calculated according to Formula (7).9 Thickness Uniformity Test of Bipolar Plate Component9.1 Test instrument The test instrument includes the following equipment and tools. 9.2 Preparation of sample 9.2.1 The sample is a complete bipolar plate, with 5 samples (ensure 3 valid values to be obtained); and shall be free of wrinkles, scratches and damage. 9.2.2 For samples from different batches, they shall be sampled separately. 9.3 Test methods 9.3.1 Test at 25℃±2℃. 9.3.2 The zero point of the thickness gauge shall be calibrated before each measurement; and its zero point shall be rechecked after each sample measurement. 9.3.7 At the sample measurement position, use a thickness gauge to measure the thickness of the sealing groove edge or ridge on both sides of the sealing groove or flow field channel; and take the value on the larger side of the measurement value as the thickness of the sample. 9.4 Data processing 9.4.1 Data processing is performed on the thickness uniformity of the sample sealing area and active area, respectively. 9.4.2 The thickness uniformity of the sample is expressed by the average thickness, thickness 9.4.3 The average thickness of the sample is calculated according to Formula (8). 9.4.4 The thickness range of the sample is calculated according to Formula (9). 9.4.5 The standard deviation of the sample thickness is calculated according to Formula (10). ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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