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GB/T 40792-2021: Test method of weight loss of sintered neodymium iron boron permanent magnets
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Test method of weight loss of sintered neodymium iron boron permanent magnets
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GB/T 40792-2021
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Basic data | Standard ID | GB/T 40792-2021 (GB/T40792-2021) | | Description (Translated English) | Test method of weight loss of sintered neodymium iron boron permanent magnets | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H14 | | Word Count Estimation | 10,112 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 40792-2021: Test method of weight loss of sintered neodymium iron boron permanent magnets---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Test method of weight loss of sintered neodymium iron boron permanent magnets
ICS 77.120.99
CCSH14
National Standards of People's Republic of China
Weight loss test method of sintered neodymium iron boron permanent magnet
Released on 2021-10-11
2022-05-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents.
This document was proposed and managed by the National Rare Earth Standardization Technical Committee (SAC/TC229).
This document was drafted by. Beijing Zhongke Sanhuan High-tech Co., Ltd., Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, and
Huan Waukehua (Beijing) Magnetic Devices Co., Ltd., Ningbo Yunsheng Co., Ltd., Fujian Changting Jinlong Rare Earth Co., Ltd., Iron and Steel Research
Headquarters, Tianjin Sanhuan Lexi New Materials Co., Ltd., Anhui Dadixiong New Materials Co., Ltd., Baotou Rare Earth Research Institute, North China Rare Earth
(Group) High-Tech Co., Ltd., Ganzhou Fuerte Electronics Co., Ltd., Ningbo Kenida Industrial Co., Ltd., Beijing Goldwind Science and Technology Co., Ltd.
Wind Power Equipment Co., Ltd.
The main drafters of this document. Jin Guoshun, Cao Shuohao, Xue Huili, Wang Ying, Song Zhenlun, Song Guanyu, Chen Guoan, Li Lingling, Li Haiying,
Zhu Minggang, Liu Wuli, Huang Xiulian, Liu Guozheng, Wang Rongxia, Qi Zhiqi, Gu Chenghong, Song Quan, Jiang Jianjun, Shen Guodi, Zhang Shifu, He Yunfang,
Shi Xiaoning and Fu Jianlong.
Weight loss test method of sintered neodymium iron boron permanent magnet
1 Scope
This document specifies the weight loss test method for sintered NdFeB permanent magnets under high temperature, high pressure, and water vapor environmental conditions.
This document is suitable for evaluating the corrosion resistance of sintered NdFeB permanent magnets under high temperature, high pressure, and water vapor environmental conditions.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
GB/T 626-2006 Chemical reagent nitric acid
GB/T 678 Chemical reagent ethanol (anhydrous ethanol)
GB/T 8170 Numerical rounding rules and the expression and determination of limit values
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Sinteredneodymiumironboronpermanentmagnet
A block sintered neodymium iron boron permanent magnet material with a certain geometric shape.
Note. Including sintered NdFeB permanent magnet blanks, semi-finished products and finished products.
3.2
Magnetic orientation surfaceperpendiculartothemagneticorientationdirection
Regularly shaped anisotropic permanent magnets whose surfaces are perpendicular to the easy magnetization direction or irregularly shaped permanent magnets are processed into regular shapes
The surface perpendicular to the opposite direction of easy magnetization after the sample.
Note 1.Permanent magnets have regular shapes such as squares, columns, rings, etc.; irregular shapes such as tile-shaped, etc.
Note 2.The magnetization orientation direction is the easy magnetization direction of the magnet.
3.3
Weightloss
WL
The sintered neodymium iron boron permanent magnet sample is exposed to high temperature and high pressure water vapor environmental conditions, and the surface area per unit magnetic orientation surface is paired due to corrosion.
Should the quality loss.
Note. The unit of weight loss is milligrams per square centimeter (mg/cm2).
4 Method summary
Put the sintered neodymium iron boron permanent magnet sample that has been accurately weighed and dimensioned into a high-pressure container, and the sample is evaporated in high-temperature and high-pressure water.
Under the action of gas, the surface grains react with water vapor, causing the grains to peel off and the surface layer to corrode and pulverize. After continuing the test for a certain period of time, take out the test
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