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GB/T 19823-2020: Thermal spraying--Procedures for the application of thermally sprayed coatings for engineering components
Status: Valid GB/T 19823: Evolution and historical versions
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| GB/T 19823-2020 | English | 259 |
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Thermal spraying--Procedures for the application of thermally sprayed coatings for engineering components
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GB/T 19823-2020
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| GB/T 19823-2005 | English | 394 |
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Thermal spraying procedures for the application of thermally sprayed coating for engineering components
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GB/T 19823-2005
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PDF similar to GB/T 19823-2020
Basic data | Standard ID | GB/T 19823-2020 (GB/T19823-2020) | | Description (Translated English) | Thermal spraying--Procedures for the application of thermally sprayed coatings for engineering components | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A29 | | Classification of International Standard | 25.220.20 | | Word Count Estimation | 14,168 | | Date of Issue | 2020-06-02 | | Date of Implementation | 2021-04-01 | | Older Standard (superseded by this standard) | GB/T 19823-2005 | | Quoted Standard | GB/T 11373; GB/T 18719; GB/T 19824; GB/T 37421; EN 15520 | | Adopted Standard | ISO 14921-2010, MOD | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | | Summary | This standard specifies the general process rules for thermal spray coatings used to improve the surface performance of parts or in the repair and remanufacturing of waste parts. Due to the diversity of thermal spraying processes, shapes of sprayed parts, and physical and chemical properties of coatings, this standard does not provide a definitive solution for specific part coatings. This standard applies to the selection of thermal spray process specifications and coating materials in general. This standard does not apply to atmospheric corrosion resistant thermal sprayed zinc, aluminum and its alloy coatings for steel structures. The applicable standard for thermal sprayed zinc, aluminum and their alloy coatings is GB/T 9793. This standard also does not apply to self-fluxing alloy remelting coatings. The applicable standard for self-fluxing alloy remelting coatings is GB/T 16744. | GB/T 19823-2020: Thermal spraying--Procedures for the application of thermally sprayed coatings for engineering components
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Thermal spraying--Procedures for the application of thermally sprayed coatings for engineering components
ICS 25.220.20
A29
National Standards of People's Republic of China
Replace GB/T 19823-2005
Application steps of thermal spray coating for thermal spray engineering parts
2020-06-02 released
Implementation on 2021-04-01
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅰ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Principles of coating design and coating implementation 1
5 Turning, milling, grinding pre-processing 2
6 Shadow 2
7 Surface pretreatment method 3
8 Thermal spray 3
9 Inspection after application 3
10 closed 3
11 Processing after coating 3
12 Final inspection 3
13 Preparation of documents 3
Appendix A (informative appendix) Flow chart for assessing the suitability of thermal spraying process 5
Appendix B (informative appendix) Determine the expected target inspection items for the best coating system 6
Appendix C (informative appendix) Thermal spray process specification application record 7
Reference 10
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 19823-2005 "Application Procedures for Thermal Spray Coating of Thermal Spray Engineering Parts". This standard and
Compared with GB/T 19823-2005, the main technical changes are as follows.
---Modified the "normative references" (see Chapter 2, Chapter 2 of the.2005 edition);
--- Added "Terms and Definitions" (see Chapter 3);
--- Added "Preparation Document" (see Chapter 13).
This standard uses the redrafting method to modify and adopt ISO 14921.2010 "Application Procedures for Thermal Spray Coating of Thermal Spray Engineering Parts".
The technical differences between this standard and ISO 14921.2010 and the reasons are as follows.
---Regarding normative reference documents, this standard has made adjustments with technical differences to adapt to my country's technical conditions and adjustments.
The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows.
● Replace ISO 2063 with GB/T 9793 equivalent to the international standard (see Chapter 1), and GB/T 9793 is listed as a reference
literature;
● Use GB/T 11373 instead of EN13507 (see Chapter 7);
● Replace ISO 14920 (see Chapter 1) with GB/T 16744 modified to adopt international standards, and GB/T 16744 is listed as a reference
literature;
● Replace ISO 14917 with GB/T 18719 modified to adopt international standards (see Chapter 3);
● Replace ISO 14918 with GB/T 19824 which is modified to adopt international standards (see Chapter 8);
● Replace ISO 14923 (see Chapter 9) with GB/T 37421 modified to adopt international standards.
This standard has made the following editorial changes.
---The content of Chapter 1 "Scope" has been reorganized according to GB/T 1.1-2009.
This standard was proposed by China Machinery Industry Federation.
This standard is under the jurisdiction of the National Standardization Technical Committee for Metal and Non-metal Coatings (SAC/TC57).
Drafting organizations of this standard. Foshan Advanced Surface Technology Co., Ltd., Spree Technology Co., Ltd., Beijing Mining and Metallurgical Technology Group Co., Ltd.,
Wuhan Materials Protection Research Institute Co., Ltd., Ruili Group Ruian Auto Parts Co., Ltd.
The main drafters of this standard. Li Zhigang, Yu Yueguang, Liang Dong, Chen Tongzhou, Liu Jianhui, Shen Jie, Cao Qing, Gao Mingchuan, Liang Weijian, Ye Yonghong,
Zhang Zaiwei.
The previous versions of the standard replaced by this standard are as follows.
---GB/T 19823-2005.
Application steps of thermal spray coating for thermal spray engineering parts
1 Scope
This standard specifies the general process for thermal spray coating to improve the surface performance of parts or the repair and remanufacturing of waste parts.
Procedures. Due to the diversity of the thermal spraying process, the shape of the sprayed parts, and the physicochemical properties of the coating, this standard does not provide for the coating of specific parts.
Provide a decisive solution.
This standard applies to the general situation of selecting thermal spraying process regulations and coating materials. This standard does not apply to steel structure resistant to atmospheric environment
Corrosion thermal spraying zinc, aluminum and its alloy coating, the applicable standard for thermal spraying zinc, aluminum and its alloy coating is GB/T 9793.This standard also does not
It is suitable for self-fluxing alloy remelting coating. The applicable standard of self-fluxing alloy remelting coating is GB/T 16744.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 11373 Surface pretreatment of thermal sprayed metal parts
GB/T 18719 Terminology and classification of thermal spraying (GB/T 18719-2002, ISO 14917.1999, MOD)
GB/T 19824 Thermal spray thermal spray operator assessment requirements (GB/T 19824-2005, ISO 14918.1998, MOD)
GB/T 37421 Characterization and testing of thermal spray coatings (GB/T 37421-2019, ISO 14923.2003, MOD)
3 Terms and definitions
The terms and definitions defined in GB/T 18719 apply to this document.
4 Principles of coating design and coating implementation
4.1 General principles
The factors that should be considered in the implementation principles of parts and coatings are described in the process shown in Appendix A. If any of the clauses in 4.2~4.4 are not satisfied
If sufficient, thermal spraying technology is not recommended.
Judge whether the new part can be sprayed by evaluating the sprayed parts and sprayed area.
If the coating material is determined by the coating specification, the influencing factors considered will be reduced.
4.2 Pre-check before repairing parts
The parts must be inspected before the thermal spraying process to determine whether it is suitable for spraying. It should be noted.
---When the workpiece is a rotating part, the concentricity and flatness of the part should be checked. When the workpiece is a reciprocating sliding part, the part should be checked.
Geometric shape, if necessary, the geometric shape error of the part should be corrected;
---Check whether there are cracks or other damages on the surface of the workpiece to be sprayed that affect the performance of the coating. If there are defects that cannot be eliminated, do not
Can carry out spraying construction;
---Determine the spraying area and scope of the parts;
---Check and remove any remaining coating on the surface of the workpiece;
---Check and determine the surface hardness of the workpiece.
4.3 Part base
Whether the thermal spray coating can meet the expected goals, the following factors should be considered.
---Whether the matrix material is not suitable for thermal spraying process or the factors that need special consideration during spraying process.
---Under normal circumstances, the thermal spray coating will not increase the strength of the part, so any reduction in the size of the original part should be considered for the strength
influences.
---Surface treatment methods, spraying materials, and spraying process may affect the fatigue strength of parts.
---Special surface hardening treatment process such as nitriding treatment residual gas may affect the surface pretreatment, coating bonding strength and coating holes
The gap rate has an adverse effect.
---When the hardened layer hinders the normal surface treatment, it must fully consider its restrictions on the application of the coating system and the subsequent coating
The impact of layer performance.
---To obtain a complete coating, a complete coating preparation process must be formulated. Spray pretreatment requirements, spray and test, spray gun and
Related electrical and pneumatic connections, spraying distance and spraying angle need to be considered.
4.4 Coating
The spraying process and spraying materials have a great influence on the performance of the coating. In order to determine the most suitable coating system, the following factors need to be considered.
--- Bond strength requirements;
---Thickness requirements;
---Surface condition (roughness) requirements;
--- Surface load, thermal spray coating is not suitable for parts sensitive to line contact or point contact stress;
---Final coating performance requirements, such as resistance to different types of mechanical wear, corrosion, chemical attack, high temperature, thermal cycling and other environmental conditions
Piece performance;
--- When the porosity in the coating does not meet the requirements, appropriate sealing agents and sealing methods should be used for sealing treatment;
---The oxide content of the coating, if necessary, can be controlled by the selection of process parameters and spray materials.
Appendix B lists in detail the inspection items required to achieve the desired goal of the best coating system.
5 Turning, milling, grinding pre-processing
When parts are re-coated, all residual coatings should be completely removed. The influence of the pretreatment that has been carried out on the coating of special requirements should be considered
Possibility, such as improving fatigue strength.
Carry out pre-cutting processing, cut off the wear profile and ensure the uniformity of the coating thickness. When preparing a coating for a new part, the area to be sprayed should be
Cutting treatment, the amount of undercutting is the thickness of the coating.
Pieces. These contour designs are recommended in EN15520.
For shaft parts, the processed surface maintains the concentricity with the relevant axis to ensure the uniformity of the coating thickness.
Pre-cutting should be carried out as far as possible under the condition of avoiding the use of lubricants, especially for porous matrix materials.
When necessary, the pre-processed parts should be degreased.
6 Masking
The surface of the workpiece that does not need to be sprayed should be shielded by appropriate materials. The ideal shielding material should have both resistance to impact and bearing during sandblasting.
The ability to be affected by heat during spraying, otherwise, different masking materials should be used in the sandblasting and spraying processes.
Measures should be taken at all times to ensure that the masking material does not contaminate the surface to be sprayed.
7 Surface pretreatment method
Before surface pretreatment, the pollution generated on the pretreatment surface should be directly removed and purified.
A suitable surface pretreatment method can obtain the maximum bonding strength between the coating and the metal substrate. Sandblasting is a common method to achieve this goal.
The surface pretreatment method should be carried out in accordance with GB/T 11373.If there is a difference, the contracting parties shall reach an agreement through consultation.
8 Thermal spray
After surface pretreatment, the process parameters given in the thermal spraying process specification should be used for spraying as soon as possible. Between spraying and sandblasting,
Take reasonable precautions to prevent contamination of the surface after pretreatment.
Properly preheat the surface to be sprayed before spraying, avoid contamination of the surface to be sprayed and local overheating.
Before and during spraying, the surface should be sufficiently heated to prevent moisture condensation.
During spraying, it is necessary to control the temperature of the coating to avoid excessive residual stress, which determines the performance of the coating.
Dust inclusions in the coating should be minimized.
All spraying equipment should be operated in accordance with the manufacturer's instructions.
Equipment operators should obtain qualifications in accordance with GB/T 19824, or obtain equivalent qualifications through negotiation between the parties to the agreement.
9 Inspection after application
After the coating has cooled to room temperature, the coating should be inspected according to the following methods.
--- Visually inspect the coating according to GB/T 37421;
---Measure the thickness of the coating.
If coating peeling, cracks, or any other unqualified defects are observed, the coating should be completely removed, according to the spraying process regulations or selection
A newly revised spraying process specification, re-pretreatment and spraying.
10 closed
If necessary, the thermal spray coating can be sealed. There are a series of different sealing agents and sealing methods for the sealing treatment.
The method provided by the supplier is closed treatment.
Sealing treatment should be carried out immediately after spraying the coating. If the sealant contains a certain solvent, the seal should be after the coating has cooled to room temperature
get on.
11 Processing after coating
The coating can be processed by turning, milling, grinding and other processing methods. Refer to the mechanical processing and mechanical processing of several thermal spray coatings recommended by ISO 14924
Post-processing method.
12 Final inspection
The final inspection items of the coating are as follows.
---The dimensional accuracy is within the specified tolerance range;
--- Reach the specified surface roughness;
--- Visual inspection of coating defects, such as pores, scratches, cracks, and peeling (see GB/T 37421);
---Remove excess coating;
---Part cleanliness;
---Other provisions, such as the indicators required by the contract.
13 Preparation of documents
In order to meet the requirements of quality management, the establishment of records including all production procedures, if necessary, should contain all the data of the test.
Appendix C is an example of the application of thermal spray production process specification records. This record can also be used as a guide document for thermal spraying operation specifications.
Appendix A
(Informative appendix)
Flow chart for evaluating the suitability of thermal spraying process
The flow chart for evaluating the suitability of the thermal spraying process is shown in Figure A.1.
Figure A.1 Flow chart for evaluating the suitability of thermal spraying process
Appendix B
(Informative appendix)
Determine the expected target inspection items for the best coating system
The following are the inspection items to determine the expected goals of the best coating system.
1.Dimensions of parts.
2.Brief description of part function.
3.Area to be sprayed.
4.Area to be covered.
5.Special measures that need to be taken during the spraying operation.
6.Coating function.
Is it sports surface? Yes/No
If yes, what is the friction pair?
Is there lubrication? Yes/No
If not, is there any abrasive wear? Yes/No
If yes, wear medium?
7.Does it withstand the chemical attack of liquid or gas? Yes/No
If yes, determine the type and concentration of chemical attack media.
8.Is the working temperature the same as the ambient temperature? Yes/No
If not, please indicate the working temperature.
9.Is there a thermal shock? Yes/No
If so, describe in detail.
10.Coating thickness.
11.Does the coating require post-processing? Yes/No
If necessary, determine the technical requirements, dimensions, tolerances and surface roughness.
12.Determine the concentricity requirements.
13.Describe the special requirements not covered above.
Appendix C
(Informative appendix)
Thermal spraying process specification application record
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