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GBZ45463-2025: Method for porosity measurement of thermally sprayed coatings
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Method for porosity measurement of thermally sprayed coatings
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GB/Z 45463-2025
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Basic data | Standard ID | GB/Z 45463-2025 (GB/Z45463-2025) | | Description (Translated English) | Method for porosity measurement of thermally sprayed coatings | | Sector / Industry | National Standard | | Classification of Chinese Standard | A29 | | Classification of International Standard | 25.220.20 | | Word Count Estimation | 14,154 | | Date of Issue | 2025-03-28 | | Date of Implementation | 10/1/2025 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GBZ45463-2025: Method for porosity measurement of thermally sprayed coatings---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.
GB /Z 45463-2025.Determination of porosity of thermal spray coatings
ICS 25.220.20
CCSA29
Guiding technical documents of the People's Republic of China on national standardization
Determination of Porosity of Thermal Sprayed Coatings
sprayed coatings, MOD)
Released on 2025-03-28
2025-10-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Purpose 1
5 Categories 1
6 Principle 1
7 Equipment 1
8 Metallographic sample preparation 2
8.1 Overview 2
8.2 Cutting 2
8.3 Cleaning 2
8.4 Mosaic 2
8.5 Grinding and polishing 3
9 Metallographic Inspection Process 4
10 Characterization of Porosity 4
11 Test Report 5
Appendix A (Informative) Table of tα values at different n and α values 6
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.
This document is modified to adopt ISO /T R26946.2011 "Determination of porosity of thermal spray coatings".
Compared with ISO /T R26946.2011, this document has made the following structural adjustments.
--- Chapter 4 corresponds to Chapter 2 in ISO /T R26946.2011;
--- Chapter 5 corresponds to Chapter 3 of ISO /T R26946.2011;
--- Chapter 6 corresponds to Chapter 4 of ISO /T R26946.2011;
--- Chapter 7 corresponds to Chapter 5 and 5.1~5.6 in ISO /T R26946.2011;
--- Chapter 8 corresponds to Chapter 6 of ISO /T R26946.2011; 8.1~8.5 correspond to Chapter 6 of ISO /T R26946.2011
6.1~6.5;
--- Chapter 9 corresponds to Chapter 7 of ISO /T R26946.2011;
--- Chapter 10 corresponds to Chapter 8 of ISO /T R26946.2011;
--- Chapter 11 corresponds to Chapter 9 in ISO /T R26946.2011.
The technical differences between this document and ISO /T R26946.2011 and their reasons are as follows.
--- Changed the scope of application (see Chapter 1);
--- Changed the requirements for equipment and metallographic sample preparation personnel (see Chapter 7, Chapter 5 of ISO /T R26946.2011) to adapt to our
Technical conditions of the country;
--- Added abrasive size units (see 8.5 Table 2) to adapt to my country's technical conditions;
--- Changed the metallographic inspection process requirements (see Chapter 9, Chapter 7 of ISO /T R26946.2011) to adapt to my country's technology
condition.
The following editorial changes were made to this document.
--- Added the introductory words of Appendix A to adapt to the technical conditions of my country;
--- Deleted Appendix B (informative).
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 Technical Committee for Standardization of Metallic and Non-metallic Coverings (SAC/TC57).
This document was drafted by. Wuhan Institute of Materials Protection Co., Ltd. of China Machinery Engineering Academy Group, Anhui University of Technology, Dongfang Electric Group
Dongfang Steam Turbine Co., Ltd., Beijing Jinlun Kuntian Special Machinery Co., Ltd., Chongqing University, Shanghai Junshan Surface Technology Engineering Co., Ltd.
Shenyang Ruite Heat Meter Power Technology Co., Ltd., Nanning Bureau of Ultra-high Voltage Transmission Company of China Southern Power Grid Co., Ltd., Tianjin Zhujin Technology
Technology Development Co., Ltd.
The main drafters of this document are. Chen Tongzhou, Zhang Shihong, Wang Wei, You Xiaoming, Wang Fan, Wang Xiaoming, Gong Xiufang, Wei Jiao, Chen Jisheng, Cao Xiaoying,
Qian Zhu, Gao Mingchuan, Shi Guizhen, Yi Juan.
Determination of Porosity of Thermal Sprayed Coatings
1 Scope
This document describes a method for characterizing the porosity of thermal spray coatings by metallographic observation.
This document is applicable to the determination of the porosity of thermal sprayed oxide ceramic coatings (such as Al2O3, ZrO2 and TiO2).
The evaluation of the rate can also refer to this method.
2 Normative references
This document has no normative references.
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Purpose
The main purpose of measuring porosity is to ensure that the quality of thermal spray coatings is not affected by porosity, especially in critical surfaces with functional requirements.
On the surface.
This document provides a standard test procedure for determining the porosity of thermal spray coatings as part of a comprehensive quality assurance program.
This document is also intended to provide a standard method for determining the porosity of thermal spray coatings.
5 Categories
Due to the characteristics of thermal spraying process, the microstructure of thermal spraying coating is mainly manifested in various pores, microcracks, flat particle interfaces and uncoated particles.
Although different terms are used, pores and microcracks are essentially volumes that do not contain coating material. Porosity can be
There are closed pores, open pores and micropores. Closed pores appear in the coating as independent or clustered holes, which are not connected to the surface.
The closed-cell structure is similar, but it is directly connected to the atmosphere, or different pores are connected and then connected to the atmosphere; micropores have both closed pores and open pores.
Their size is measurable only on a microscopic scale. Pores and microcracks differ primarily in their aspect ratio (ratio of major axis to minor axis), so they
The proportion of the volume space occupied by pores in the thermal spray coating is called porosity.
6 Principles
The porosity of thermal spray coatings is determined by preparing cross sections of coatings with high microscopic surface quality using an optical microscope.
Microscopy or scanning electron microscopy (recommended) to quantify the porosity of the coating being examined by using image analysis techniques on the microscope
Evaluate.
7 Equipment
The equipment required to measure the porosity of thermal spray coatings is as follows.
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