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GB/T 29918-2023: Rare earth-based hydrogen storage alloys - Test method for measurement of pressure-composition isotherm(PCI)
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 29918-2023	English	349	Add to Cart	4 days [Need to translate]	Rare earth-based hydrogen storage alloys - Test method for measurement of pressure-composition isotherm(PCI)
GB/T 29918-2013	English	399	Add to Cart	3 days [Need to translate]	Method for measuring pressure-composition isotherms of RE-base AB5 hydrogen storage alloys

GB/T 29918-2023: Rare earth-based hydrogen storage alloys - Test method for measurement of pressure-composition isotherm(PCI)

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ICS 77.120.99 CCSH14 National Standards of People's Republic of China Replace GB/T 29918-2013 Rare earth hydrogen storage alloy Test Method for Pressure-Composition Isotherm (PCI) Published on 2023-08-06 2024-03-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration Committee

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document replaces GB/T 29918-2013 "Method for determination of pressure-composition isotherm (PCI) of rare earth AB5 type hydrogen storage alloy" and is consistent with Compared with GB/T 29918-2013, in addition to structural adjustments and editorial changes, the main technical changes are as follows. a) The scope of application has been changed. the pressure range of method 1 volumetric method is "0.001MPa~10MPa", and the electrochemical test method has been added. Scope of application of the law (see Chapter 1, Chapter 1 of the.2013 edition); b) Added requirements for reagents and materials in Method 1 (see 4.3); c) Added parallel tests in Method 1 (see 4.5); d) Changed the terms and data of precision of Method 1 (see 4.8, Chapter 8 of the.2013 edition); e) Added "Method 2.Electrochemical method" (see Chapter 5); f) Added “any circumstances that may affect the results” in the test report [see Chapter 6 k), Chapter 9 of the.2013 edition]. This document is proposed and coordinated by the National Rare Earth Standardization Technical Committee (SAC/TC229). This document was drafted by. Baotou Rare Earth Research Institute, Inner Mongolia Rare Earth Hydrogen Storage Alloy Co., Ltd., Antai Environmental Engineering Technology Co., Ltd. Youyan Engineering Technology Research Institute Co., Ltd., Zhongrare (Weishan) Rare Earth New Materials Co., Ltd., National Standard (Beijing) Inspection and Certification Co., Ltd., Er Doss Institute of Applied Technology, Institute of Resource Utilization and Rare Earth Development, Guangdong Academy of Sciences. The main drafters of this document. Xu Jin, Wang Li, Li Baoquan, Wang Yongguang, Ji Liqiang, Yuan Huiping, Li Jun, Yu Limin, Zhu Xiaomei, Zhou Qing, Song Guanyu, Shen Lihan, Yan Huizhong, Yang Fan, Wang Wei, Jiang Lijun, Zhang Wei, Niu Xiaowei, Liu Zhiping, Wu Daifeng, Liu Qianwen, Liu Xiaopeng, Zhou Zenglin. This document was first published in.2013 and this is the first revision. Rare earth hydrogen storage alloy Test Method for Pressure-Composition Isotherm (PCI) Warning --- Personnel using this document should have practical experience in regular laboratory work. This document does not address all possible safety question. Users should have certain professional knowledge and skills and be fully aware of possible gas leaks, current leaks, fire or other serious consequences.

1 Scope

This document specifies the pressure-composition isotherm (PCI) test method for rare earth hydrogen storage alloys. This document is applicable to the pressure-composition isotherm (PCI) test of rare earth hydrogen storage alloys. This document contains 2 test methods. Method 1 Volume method, measuring pressure range. 0.001MPa~10MPa; Method 2 Electrochemistry Method, the measurement range is rare earth hydrogen storage alloys whose platform pressure is lower than the local atmospheric pressure 0.01MPa.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document. GB/T 3634.2 Hydrogen Part 2.Pure hydrogen, high-purity hydrogen and ultra-pure hydrogen GB/T 4842 Argon GB/T 4844 Pure helium, high-purity helium and ultra-pure helium GB/T 6003.1-2022 Technical requirements and inspection of test sieves Part 1.Wire braided mesh test sieves GB/T 6379.2 Accuracy of measurement methods and results (correctness and precision) Part 2.Determination of repeatability of standard measurement methods Basic methods of sex and reproducibility GB/T 6682 Specifications and test methods for water used in analytical laboratories GB/T 7160 Nickel carbonyl powder GB/T 8170 Numerical rounding rules and representation and determination of limit values GB/T 15676 Rare earth terminology GB/T 26412 Metal hydride-nickel battery negative electrode rare earth AB5 type hydrogen storage alloy powder GB/T 31963 Metal hydride-Rare earth magnesium superlattice hydrogen storage alloy powder for negative electrode of nickel battery YS/T 376 physically pure platinum wire YS/T 484 Determination of specific capacity of hydrogen storage alloy for negative electrode of metal hydride nickel battery

3 Terms and definitions

The terms and definitions defined in GB/T 15676 apply to this document. 4 Method 1.Volume method 4.1 Summary of methods According to the reversible hydrogen absorption/desorption characteristics of rare earth hydrogen storage alloys under certain pressure and temperature, the ideal gas equation of state is used to calculate the ...