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GB/T 38986-2020: Methods of descaling and cleaning for zirconium and zirconium alloy surfaces
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 38986-2020 | English | 119 |
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Methods of descaling and cleaning for zirconium and zirconium alloy surfaces
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GB/T 38986-2020
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Basic data | Standard ID | GB/T 38986-2020 (GB/T38986-2020) | | Description (Translated English) | Methods of descaling and cleaning for zirconium and zirconium alloy surfaces | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H14 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 6,655 | | Date of Issue | 2020-07-21 | | Date of Implementation | 2021-06-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 38986-2020: Methods of descaling and cleaning for zirconium and zirconium alloy surfaces---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.
Methods of descaling and cleaning for zirconium and zirconium alloy surfaces
ICS 77.120.99
H14
National Standards of People's Republic of China
Zirconium and zirconium alloy surface descaling and cleaning method
2020-07-21 released
2021-06-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China Nonferrous Metals Industry Association.
This standard is under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243).
Drafting organizations of this standard. National Nuclear Baoti Zirconium Industry Co., Ltd., Northwest Zirconium Tube Co., Ltd., Baoji Titanium Industry Co., Ltd., Youyan Gong
Cheng Technology Research Institute Co., Ltd., Non-ferrous Metal Technology and Economic Research Institute.
The main drafters of this standard. Hu Xukun, Yu Haihui, Yue Qiang, Li Xiaoying, Zhao Linke, Xie Chen, Luo Yuanhui, Gao Feng, Li Xianjun, Bai Zhihui.
Zirconium and zirconium alloy surface descaling and cleaning method
1 Scope
This standard specifies the surface descaling and cleaning methods of zirconium and zirconium alloy products.
This standard applies to the removal of oxides and dirt on the surface of zirconium and zirconium alloy products (hereinafter referred to as zirconium materials) during the production and use process
And foreign objects in the form of surface contamination.
2 General
The surface treatment methods of zirconium mainly include degreasing cleaning, pickling cleaning and descaling. It is recommended to use one or several combinations in the application.
Clean up oxides, dirt and foreign objects in the form of surface contamination.
3 Degreasing and cleaning
For zirconium materials that cause surface pollution when various greases, oils and lubricants are used in the process of pressure processing and mechanical processing, the following can be used
One or several combinations of degreasing and cleaning methods.
a) Alkaline or emulsion immersion cleaner cleaning;
b) Ultrasonic cleaning;
c) Acetone, citrus-based cleaners or safe solvent soak cleaning;
d) Steam degreasing cleaning;
e) Alkaline electrolysis cleaning. During electrolysis, the workpiece can be anode or cathode; during the electrolysis process, voltage and current should be controlled to prevent
Spark discharge causes pits on the surface of the workpiece.
4 Pickling cleaning
4.1 When heated below 540 ℃, the oxide and oxide color produced on the surface of the zirconium material can be removed by pickling.
4.2 The proportion (volume) of the pickling solution is. 10%~45% nitric acid (68%) 1%~5% hydrofluoric acid (50%) water (the balance). If so
With other concentrations of nitric acid and hydrofluoric acid, you can refer to the above acid solution concentration for the corresponding conversion.
4.3 Pickling should be carried out at a temperature lower than 50°C, and the best pickling temperature should be close to 30°C.
4.4 The zirconium material after mechanical grinding or degreasing cleaning treatment can be immersed in acid liquid to complete the surface cleaning.
5 Descale
5.1 If the surface of the zirconium material has loose scales, it can be cleaned by impact descaling. The following items should be paid attention to.
a) The medium for impact descaling can be alumina, silicon carbide, silica sand, steel grit, steel shot, etc., and it should be replaced regularly during use.
b) Impact descaling may cause residual stress on the surface of the zirconium material and cause local deformation, so the thickness of the plate or
It is not recommended to use the impact dephosphorization cleaning method for the strip.
c) Zirconium materials are generally not pickled after impact descaling. But if there is pollution on the surface of zirconium material caused by interstitial elements (such as carbon, oxygen and nitrogen)
The layer cannot be completely removed by impact descaling, it can be removed thoroughly with pickling cleaning method.
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