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GB/T 39495-2020: (Metal and other inorganic coatings Chromium-free chemical conversion coatings for aluminum and aluminum alloys)
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 39495-2020 | English | 169 |
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(Metal and other inorganic coatings Chromium-free chemical conversion coatings for aluminum and aluminum alloys)
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GB/T 39495-2020
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Basic data | Standard ID | GB/T 39495-2020 (GB/T39495-2020) | | Description (Translated English) | (Metal and other inorganic coatings Chromium-free chemical conversion coatings for aluminum and aluminum alloys) | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | A29 | | Word Count Estimation | 9,997 | | Date of Issue | 2020-11-19 | | Date of Implementation | 2021-10-01 | | Regulation (derived from) | National Standard Announcement No. 26 of 2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39495-2020: (Metal and other inorganic coatings Chromium-free chemical conversion coatings for aluminum and aluminum alloys)
---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.
(Metal and other inorganic coatings Chromium-free chemical conversion coatings for aluminum and aluminum alloys)
ICS 25.220.20
A29
National Standards of People's Republic of China
Metal and other inorganic coatings
Chromium-free chemical conversion coating for aluminum and aluminum alloy
2020-11-19 released
2021-10-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Foreword
This standard was drafted in accordance with the regulations given in 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. Wuhan Institute of Materials Protection Co., Ltd., Zhuhai Ogilvy Fine Chemical Co., Ltd., Hefei Huaqing Fangxing
Surface Technology Co., Ltd., Guangzhou Sanfu New Material Technology Co., Ltd., Wuhan Institute of Standardization.
The main drafters of this standard. Zhang Dezhong, Mao Zuguo, Jia Jianxin, Ao Zhonghua, Liu Wanqing, He Yuan, Tian Zhibin, Zhan Yiteng, Huang Qing, Huang Yong,
Yi Juan, Zhao Tao, Zhang Qi.
Introduction
The chemical transformation of aluminum and aluminum alloys is divided into chromate chemical transformation (hexavalent chromium, trivalent chromium) and chromium-free chemical transformation. Chromate Chemical Conversion
The art is simple, the conversion film has excellent performance and is widely used. However, because the chromium ions (especially hexavalent chromium) in the conversion solution are carcinogens, it affects the operation
People's health and waste liquid pollute the environment. It is a trend to look for chromium-free chemical conversion processes that replace chromate chemical conversion.
According to the main components of the conversion solution, chromium-free conversion includes. water oxidation, zirconium salt conversion, titanium salt conversion, rare earth metal salt conversion, permanganate conversion
Chemical, molybdate conversion, silicate conversion, cobalt salt conversion, lithium salt conversion, phosphate conversion, silane conversion, etc. In order to improve the performance of the conversion coating,
Into the above two or more composite conversion systems, such as titanium-zirconium system, titanium-cobalt system, titanium-zirconium-silane system.
With the introduction of many new conversion liquid formulations and the development of engineering applications, there is an urgent need to formulate technical standards to specify chromium-free chemical conversion
The requirements of the film and the test method to verify whether the film meets the requirements.
Metal and other inorganic coatings
Chromium-free chemical conversion coating for aluminum and aluminum alloy
1 Scope
This standard specifies the classification, requirements, test methods and sampling inspection procedures for aluminum and aluminum alloy water-washed and no-clean chromium-free chemical conversion coatings.
This standard applies to chromium-free chemical conversion coatings for extruded aluminum and aluminum alloy parts, profiles, coils, plates and cast aluminum alloy parts.
The chromium-free chemical conversion coating can be used as an anti-corrosion layer alone or as the bottom layer of an organic coating (such as paint, rubber, adhesive).
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 document.
For undated references, the latest version (including all amendments) applies to this document.
GB/T 3138 Terminology for surface treatment of metal and other inorganic coatings
GB/T 6461 Rating of samples and test pieces of metal and other inorganic coatings on metal substrates after corrosion tests
GB/T 9286 Cross-cut test of paint and varnish film
GB/T 10125 Artificial atmosphere corrosion test salt spray test
GB/T 12609 Electrodeposited metal coating and related finishing inspection sampling procedures
GB/T 20017 Determination of the mass per unit area of metal and other inorganic coatings. A review of gravimetric and chemical analysis methods
QJ1827 Low-resistance metal coating and chemical conversion film contact resistance test method
3 Terms and definitions
The following terms and definitions defined in GB/T 3138 apply to this document.
3.1
Conversion coating
A surface covering layer containing a base metal compound formed by a chemical or electrochemical process.
3.2
Chemical conversion coating
The base metal reacts with the conversion solution to form a surface covering layer containing the base metal compound.
3.3
Chromium-free chemical conversion coating
A chemical conversion film formed by a conversion solution that does not contain chromium (hexavalent, trivalent).
3.4
Washable chromium-free chemical conversion coating
After the conversion treatment, the chromium-free chemical conversion coating needs to be washed with water and then dried.
Note. This type of conversion film is generally used in extruded aluminum products and cast aluminum parts.
3.5
No-clean chromium-free chemical conversion coating
After the conversion treatment, no water washing is required, and a dry chromium-free chemical conversion coating is directly applied.
Note 1.This special conversion film is generally used for thin aluminum plates that are immediately coated or coated with adhesives.
Note 2.No-clean conversion coatings are being studied for more welded parts and castings.
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