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GB/T 45676-2025: Additive manufacturing - Determination of moisture content in metal powder feedstock - Karl Fischer coulometric method
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 45676-2025 | English | 219 |
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Additive manufacturing - Determination of moisture content in metal powder feedstock - Karl Fischer coulometric method
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GB/T 45676-2025
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Basic data | Standard ID | GB/T 45676-2025 (GB/T45676-2025) | | Description (Translated English) | Additive manufacturing - Determination of moisture content in metal powder feedstock - Karl Fischer coulometric method | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H71 | | Classification of International Standard | 25.030 | | Word Count Estimation | 10,117 | | Date of Issue | 2025-05-30 | | Date of Implementation | 2025-09-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 45676-2025: Additive manufacturing - Determination of moisture content in metal powder feedstock - Karl Fischer coulometric method
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ICS 25.030
CCSH71
National Standard of the People's Republic of China
Determination of Moisture Content in Metal Powders for Additive Manufacturing
Karl Fischer Coulomb method
Released on 2025-05-30
2025-09-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
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 for standardization documents"
Drafting.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Additive Manufacturing Standardization Technical Committee (SAC/TC562).
This document was drafted by. Wuxi Inspection and Certification Research Institute, Tongling University, Damo Tianyu Co., Ltd., Core Element (Hangzhou) Technology Development Co., Ltd.
Development Co., Ltd., Nanjing Institute of Environmental Sciences of the Ministry of Ecology and Environment, Saifuli Chemical Handan Co., Ltd., Swiss Metrohm China Co., Ltd., AVIC
Matt Additive Technology (Beijing) Co., Ltd., Dongguan Huanli Intelligent Technology Co., Ltd., China Machinery Research Institute of Standards and Technology (Beijing) Co., Ltd.
Co., Ltd., Ningbo Shangcai 3D Technology Co., Ltd., Tianjin Binhai Rex Laser Technology Development Co., Ltd., and Nanjing Normal University.
The main drafters of this document are. Chen Zuowang, Wang Dongsheng, Zhou Qichao, Zhou Nanjia, Zhou Hao, Lan Tian, Liu Luan, Liu Binhua, Ma Teng, Hong Zhihui, Weng Zhaonan,
Hu Juan, Pu Feng, Wang Shaobo, Tang Wenlai.
Determination of Moisture Content in Metal Powders for Additive Manufacturing
Karl Fischer Coulomb method
1 Scope
This document describes the principle of the Karl Fischer Coulometry method for the determination of water content in metal powders for additive manufacturing and specifies the reagents, instruments, and measuring methods.
Test sample sampling, test procedures and test reports.
This document is applicable to the determination of free water content of metal powders for additive manufacturing, ranging from 0.0015% to 5% (mass fraction).
The determination of free water content in non-metallic powders such as polymer materials and ceramic materials used in additive manufacturing shall be carried out as a reference.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 6682 Specifications and test methods for water used in analytical laboratories
GB/T 35351 Terminology for Additive Manufacturing
3 Terms and definitions
The terms and definitions defined in GB/T 35351 apply to this document.
4 Principle
The free water in the sample is heated and vaporized in a Karl Fischer furnace and blown into the anode liquid of the Karl Fischer reagent with nitrogen as a carrier.
The iodine ion (I-) begins to electrolyze to produce iodine (I2). Iodine (I2) reacts quantitatively with water. The water content is calculated based on the amount of electricity consumed by the electrolysis.
The reaction equations are shown in equations (1) to (3). There is a potential difference between the two electrodes immersed in the solution. When water exists in the solution, the cathode polarization resists the flow of current.
The end point of the reaction is determined by cathodic depolarization accompanied by a sudden increase in current.
Reaction.
2I--2e→I2 (1)
H2O I2 SO2 3C5H5N→2C5H5N·HI C5H5NSO3 (2)
C5H5N·SO3 ROH→C5H5NHOSO2OR (3)
5 Reagents
5.1 Karl Fischer reagent
Anolyte. Analytical grade or higher.
Cathodic solution. analytical grade or higher.
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