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GB/T 2423.51-2020 PDF in English


GB/T 2423.51-2020 (GB/T2423.51-2020, GBT 2423.51-2020, GBT2423.51-2020)
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GB/T 2423.51-2020: PDF in English (GBT 2423.51-2020)

GB/T 2423.51-2020
Environmental testing - Part 2.Test methods - Test Ke. Flowing mixed gas corrosion test
ICS 19.040
K04
National Standards of People's Republic of China
Replace GB/T 2423.51-2012
Environmental testing Part 2.Test methods
Test Ke. Flowing mixed gas corrosion test
2020-06-02 released
2020-12-01 implementation
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 Test equipment 1
4 Severity level 2
5 Pretreatment 2
6 Initial inspection 2
7 Test 2
8 Recovery 4
9 Final inspection 4
10 Information that should be given by relevant specifications 4
11 Information to be given in the test report 5
Appendix A (informative appendix) Copper sheet sample 6 for corrosion monitoring
Appendix B (informative appendix) Description of test equipment 7
Appendix C (Informative Appendix) Guidelines for the Selection of Test Methods and Test Time 11
Appendix NA (informative appendix) GB/T 2423 component 12
Reference 15
Preface
GB/T 2423 "Environmental Testing Part 2.Test Methods" is divided into several parts according to the test methods.
Refer to Appendix NA for the components of GB/T 2423.
This part is part 51 of GB/T 2423.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 2423.51-2012 "Environmental Testing Part 2.Test Method Test Ke. Flowing Mixed Gas Corrosion
test".
Compared with GB/T 2423.51-2012, the main technical changes in this part are as follows.
---Added the requirements for the cross-sectional area of the wet bulb tank placed in the test chamber in the "test equipment" (see Chapter 3);
---Modified the weight gain of the copper sheet sample obtained according to Appendix A in the "test conditions" [mg/(dm2·d)], in the method 2 from "0.3
~1.0" is changed to "0.3~1.3" (see Table 1, Table 1 of the.2012 edition);
---Added the "test conditions" related parties can negotiate and agree to use temperature and relative humidity values different from those given in Table 1 (see Table
1);
---Added the requirements for the total volume, total surface area and interval between test samples in "test samples" (see 7.2);
--- Added "Weighing with a 0.01mg resolution balance" in "Corrosion Monitoring Materials" (see 7.3);
---Modified the "test procedure" test procedure 1, test procedure 2, will "in the entire test period, the copper sample and the test sample should be together
"Conduct exposure test" is changed to "The copper sample shall be exposed together with the test sample 4 days before the test period. If necessary, copper strip test
The sample can be exposed for another 4 days during the test, and this will be written into the test report" (see 7.4,.2012 edition of 6.3.1 and 6.3.2);
---Added the requirements for no defects and surface roughness on the surface of the copper sample in the "material and size" (see A.2);
---Merge Figure B.1, Figure B.2, and Figure B.3 into Figure B.1 (see Appendix B, Appendix B of the.2012 edition).
The translation method used in this section is equivalent to the use of IEC 60068-2-60.2015 Environmental Testing Part 2-60.Test Test Ke. Flow
Mixed gas corrosion test."
This section has made the following editorial changes.
---Change the standard name to "Environmental Test Part 2.Test Method Test Ke. Flowing Mixed Gas Corrosion Test";
---Informative appendix NA "Components of GB/T 2423" has been added.
This part is proposed and managed by the National Standardization Technical Committee on Environmental Conditions and Environmental Tests for Electrical and Electronic Products (SAC/TC8).
Drafting organizations of this section. China National Electrical Research Institute Co., Ltd., Jiangsu Topmilo Environmental Testing Equipment Co., Ltd., Shanghai Zeng
Technology Co., Ltd., AVIC Great Wall Measurement and Testing (Tianjin) Co., Ltd., Guangzhou Power Supply Bureau Co., Ltd. Electric Power Test Research Institute, Guangdong
Midea Life Electric Manufacturing Co., Ltd., Fujian Xinneng Offshore Wind Power R&D Center Co., Ltd., Wuxi Soyat Test Equipment Co., Ltd.,
Shanghai Institute of Metrology and Testing Technology, Shenzhen Institute of Metrology and Quality Inspection, Zhejiang Institute of Metrology, Nanjing Wuhe Test Equipment
Co., Ltd., Bell Lab Equipment Jiangsu Co., Ltd., Shenzhen Uruit Testing Technology Co., Ltd., Ningbo Ouzhi Electrical Technology Co., Ltd.
the company.
The main drafters of this section. Xu Xuedong, Liu Xin, Zhang Yanjun, Jin Jun, Lu Guoyi, Huang Qingdan, Yu Jianhong, Zhong Mingqiu, Zhou Zhongming, Zhang Ailiang,
Zhu Jianhua, Zhang Hongyu, Zhang Dinghu, Hua Ming, Mei Liguang, Ke Cilong, Ren Honglei, Liu Jing, Huang Xiangsheng.
The previous versions of the standards replaced by this part are as follows.
---GB/T 2423.51-2000, GB/T 2423.51-2012.
Environmental testing Part 2.Test methods
Test Ke. Flowing mixed gas corrosion test
1 Scope
This part of GB/T 2423 is used to determine the impact of the indoor environment of work and storage on electrical and electronic product components, equipment and materials, especially
Corrosion effects of contact points and connectors, contact points and connectors can be individual components, assembled into a component or assembled into a complete device
Come for assessment.
The test methods provided in this section help to compare and select materials, manufacturing processes and component designs in terms of corrosion resistance. Test party
Refer to Appendix C for the selection guide of method and test time.
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.
ISO 431 refined copper profiles (Copperrefinery shapes)
IEC 60512-2-1 Electronic equipment connector test and measurement Part 2-1.Electrical continuity and contact resistance test
2a. Contact resistance millivolt method (Connectorsforelectronicequipment-Testsandmeasurements-Part 2-1.Elec-
tricalcontinuityandcontactresistancetests-Test2a.Contactresistance-Milivoltlevelresistance
method)
IEC 60512-3-1 Electronic Equipment Connector Test and Measurement Part 3-1.Insulation Test Test 3a. Insulation Resistance (Connectors
forelectronicequipment-Testsandmeasurements-Part 3-1.Insulationtests-Test3a.Insulation
resistance)
3 Test equipment
The test equipment includes climate system, studio, gas delivery system and gas concentration detection device.
The design and structure of the test equipment are optional, but each test method should meet its specified conditions in the entire working space and comply with
Meet the following requirements.
---Water droplets or suspended objects should not enter the studio;
---The air and water used for the test should be clean enough so as not to affect the test effect;
--- Ensure that the test conditions in the working space are consistent when the test gas passes through the studio;
---The gas analysis sampling point should be in the working space of the test box;
---Exhaust should be implemented in accordance with relevant legal provisions;
---The area of the wet ball tank placed in the working room should not exceed 0.1% of the cross-sectional area of the working room.
Due to the strong synergistic effect and the so-called "memory effect" (that is, the chloride is difficult to completely remove from the test chamber and pipeline), it is used as a chlorine-containing
The testing studio and piping system should be limited to chlorine testing.
The working space stipulates that the corrosion weight of the copper specimens at each position in the space shall not exceed 15% of the average corrosion weight of all copper specimens
[Refer to Appendix A, the corrosion weight of copper specimens is expressed in mg/(dm2·d)].
4 severity level
The test severity level is specified by the relevant regulations and depends on the following factors.
---Test method (selected from Table 1);
---Test time.
The test time is preferably 4d, 7d, 10d, 14d and 21d.
There are 4 test methods, the test parameters are shown in Table 1, and the application guide for each test method is shown in C.3.
Table 1 Test conditions
Test parameters Method 1 Method 2 Method 3 Method 4
H2S/(10-9vol/vol) 100±20 10±5 100±20 10±5
NO2/(10-9vol/vol) -200±50.200±50.200±20
Cl2/(10-9vol/vol)-10±5 20±5 10±5
SO2/(10-9vol/vol) 500±100--200±20
Temperature/℃a 25±1 30±1 30±1 25±1
Relative humidity/%a 75±3 70±3 75±3 75±3
Test gas volume change per hour 3~10 3~10 3~10 3~10
The weight gain of the copper sample obtained according to Appendix A/[mg/(dm2·d)] 1.0~2.0 0.3~1.3 1.2~2.2 1.2~2.4
Note. Due to the different corrosiveness of Test Method 1 to Test Method 4, the order of numbering and the corresponding corrosion weight of the copper sample does not reflect its severity level.
a The relevant parties can negotiate and agree to use different temperature and relative humidity values (such as 40°C and 80%). The weight gain of the copper sheet may be the same as the value given in the table
different.
5 pretreatment
The test sample can be pretreated according to relevant specifications, such as cleaning or mechanical operation.
6 Initial inspection
The initial inspection is carried out in accordance with relevant regulations.
Usually these tests are.
---Contact resistance test of components of electromechanical products (see IEC 60512-2-1);
---Insulation resistance test (see IEC 60512-3-1).
7 Test
7.1 Overview
The test samples include.
---The test sample to be evaluated;
---Corrosion monitoring materials.
7.2 Test sample
The relevant product specification should determine the state of the test sample during the test, such as whether the connector is connected or not, and the switch is open or closed.
Run or load.
The temperature and relative humidity of the working space should be kept within the specified range during the running or load state of the heat-dissipating test sample.
When the test sample is put into the test box, the state of the test sample and the test box should not cause condensation on the surface of the test sample.
The total volume of the test sample should not exceed 10% of the entire working space volume. If it exceeds 10%, the amount exceeding 10% shall include
In the test report.
The total surface area of the test sample should not exceed 10% of the surface area of the entire working space. If it exceeds 10%, the amount exceeding 10% should be
Include in the test report.
The minimum distance between the test samples is not less than 10mm to avoid affecting the uniform airflow.
7.3 Corrosion monitoring materials
The copper sample is used as a corrosion monitoring material to be tested together with the test sample to check the consistency of the test conditions.
The copper sample should be prepared according to Appendix A, and the quantity should be at least 5 pieces. During the test, it will be exposed together with the test sample, and the resolution should be
The weight increase value of the copper sample in the test with a 0.01mg balance is used as a measure of the degree of corrosion and the reproducibility and repeatability of the test
Sexual monitoring standards.
In addition to copper specimens, other materials such as gold-plated specimens or other specimens (see B.6.3) can also be used as corrosion monitoring materials.
7.4 Test procedure
One of the following test procedures can be used for testing.
Test procedure 1
When the test gas does not contain chlorine (method 1) or the method of measuring the chlorine concentration is not interfered by other gases in the test gas, the following should be used
program.
---After the specified temperature is stabilized, start to inject moist air to stabilize and adjust the temperature and humidity to avoid the inner wall of the working chamber and the test sample
Condensation occurs on the product.
---Start to introduce corrosive gas into the humid air and stabilize it.
---Measure and adjust the gas concentration and stabilize it; when it is necessary to measure the chlorine concentration, use all the chlorine in the test gas (not just chlorine
Gas Cl2) as the concentration of chlorine gas; the chlorine in the test gas should only be filled in the form of chlorine gas Cl2.
--- Put the test sample and the corrosion monitoring materials specified in 7.3.During the first 4 days of the test period, the copper sample should be exposed together with the test sample.
dew. If necessary, the copper sample can be exposed for another 4 days during the test, and this is written in the test report. Test samples and corrosion
The monitoring materials should be evenly distributed in the working space, and should not be in contact with each other and the test gas should not be blocked.
Relevant specifications (such as connected/disconnected, electrical load or running). The test time should be calculated from this time.
--- It may take a certain time for the test conditions to be stable; if necessary, the temperature, humidity and gas concentration can be measured and adjusted; adjusted
Any excessive gas concentration should be avoided during the process, and the maximum time for adjustment and stabilization should not exceed 24 hours.
--- During the test, the temperature, humidity and gas concentration should be kept within the specified range; the test box is allowed to be opened during the test.
The number of unpacking should be limited.
The test duration is less than 4d, and the box is not allowed to be opened;
The duration of the test is 4d~10d, and it is allowed to open the box once;
The test duration is more than 10d, and it is allowed to open the box once a week;
The unpacking duration is limited to the time necessary to take and place test samples or corrosion monitoring materials.
--- After the test, take out the test sample and corrosion monitoring materials.
Test procedure 2
When the test gas contains chlorine (method 2, method 3, method 4) or the method of measuring the chlorine content is interfered by other gases in the test gas
The following procedures should be used.
---After the specified temperature is stabilized, start to inject moist air to stabilize and adjust the temperature and humidity to avoid the inner wall of the working chamber and the test sample
Condensation occurs on the product.
---Start to introduce chlorine into the humid air and stabilize it.
---Measure and adjust the chlorine concentration and make it stable.
--- Put the test sample and the corrosion monitoring material specified in 7.3; the copper sample should be exposed to the test sample 4 days before the test period
dew. If necessary, the copper sample can be exposed for another 4 days during the test, and this is written in the test report. Test samples and corrosion
The monitoring materials should be evenly distributed in the working space, and should not be in contact with each other and the test gas should not be blocked.
Relevant specifications (such as connected/disconnected, electrical load or running).
---It may take some time to stabilize the temperature, humidity and chlorine concentration, because chlorine has a high initial chemical reaction on the surface of the test sample
With the adsorption rate; if necessary, the concentration of chlorine can be measured and adjusted; any excessive gas concentration should be avoided during the adjustment process,
The adjusted chlorine concentration is stable for at least 2h; the longest time for adjustment and stabilization should not exceed 24h.
---Start to inject other gases and stabilize them, if necessary, measure and adjust the temperature, humidity and gas concentration (except chlorine);
Any excessive gas concentration should be avoided during the festival, and the maximum time for adjustment and stabilization should not exceed 24h; the test time should be from all
Start calculation when all gas is in.
---During the test, the temperature, humidity and gas concentration should be kept within the specified range, but the chlorine concentration cannot be controlled to ensure the chlorine concentration
The method that the degree is within the specified range is to measure the chlorine content according to the regulations after the end of the test; the test box is allowed to be opened during the test.
The number of unpacking should be limited.
The test duration is less than 4d, and the box is not allowed to be opened;
The duration of the test is 4d~10d, and it is allowed to open the box once;
The test duration is more than 10d, and it is allowed to open the box once a week;
The unpacking duration is limited to the time necessary to take and place test samples or corrosion monitoring materials.
---After the test is over, in addition to continuing to pass in chlorine, stop passing in other gases, and wait for enough time to let other gases out of the test
To avoid affecting the analysis of chlorine to the greatest extent possible.
--- To ensure the validity of the test, the measured chlorine concentration should be within the specified range.
--- Take out test samples and corrosion monitoring materials.
8 Recovery
Before the final test, the test samples taken from the test box should be stored in accordance with relevant specifications.
9 Final inspection
The final test should be carried out in accordance with relevant specifications, and it can also be required to perform visual inspection on the test sample after the test.
Relevant specifications shall provide criteria for judging whether test samples are qualified or unqualified.
If the necessary tests cannot be completed within the specified time, the storage time under the recovery conditions can be extended to one week at most.
The extension of time should be stated in the test report.
10 Information to be given by relevant specifications
When the relevant specifications use this test method, the information required by the following clauses should be provided, with special attention to items marked with an asterisk (*).
Terms
a) Test method * 4
b) Test duration* 4
c) Pretreatment of test samples 5
d) Initial inspection* 6
e) The condition of the test sample during the test * 7
f) Work and load status of the test sample during the test 7
g) Recovery and its duration* 8
h) Final inspection* and possible visual inspection 9
i) Judgment criteria for qualified and unqualified * 9
11 Information to be given in the test report
The test report should give the following information.
---experiment method;
---Test duration;
---Pretreatment;
---Methods and results of initial testing;
---Test conditions and duration;
---Work and load status of the test sample during the test;
---Recovery and its duration;
---The method and result of the final test;
---The weight gain of each copper sample, in mg/(dm2·d);
--- Any inconsistencies with this section.
Appendix A
(Informative appendix)
Copper sheet sample for corrosion monitoring
A.1 Overview
The copper sheet sample is subjected to an exposure corrosion test together with the test sample to verify that the test conforms to the various limited parameters specified in this section
Sex. The weight gain of the copper sample will be used as a measure of this compliance.
A.2 Material and size
The copper sample is made of semi-hard OFHC copper plate (Cu-OF conforming to ISO 431), and the maximum thickness is 0.5mm.
The total surface area is 0.1dm2~0.2dm2.The surface of the sample is basically a defect-free surface (no pores, marks, scratches and slight light color)
And matte surface (arithmetic mean deviation of profile Ra=0.15μm±0.1μm).
A.3 Cleaning procedures
Before starting the test, the copper sample should be cleaned as follows, weighed on a balance with a resolution of 0.01 mg, and
Stored in a desiccant desiccant, the longest drying time does not exceed 120h.
The copper sample should be cleaned as follows.
---Stainless steel or platinum as anode, under electrolysis voltage 5V~10V, cathode degreasing in 1mol/L NaOH solution
15s~30s;
---Rinse with tap water;
--- Rinse with deionized water;
---Dip into 10% H2SO4 solution and activate for 20s~30s;
---Rinse with tap water;
--- Rinse with deionized water;
---Alcohol (modified ethanol or isopropanol) rinse;
--- Hot air drying (about 50°C).
All solutions are prepared with deionized water, at least the same quality as the water used in the climate system.
Appendix B
(Informative appendix)
Description of test equipment
B.1 Overview
The test equipment includes climate system, working room, gas delivery system and gas analysis system. Examples of test equipment are shown in Figure B.1.
Description.
1---Air source; 7---Condition control room;
2---Flow control; 8---Work room;
3---Air source; 9---Work space;
4---Gas analysis system; 10---Chemical filter;
5---gas mixing chamber; 11---pump.
6---Moisture source;
Figure B.1 Example of test equipment
B.2 Climate system
The climate system sends moist air into the studio. The common method is to pass compressed air through a bath with a temperature higher than the dew point of the moist air. in
When calculating the temperature, any additional dry air added to the test gas should be considered. The relative humidity of the air in the working room should be checked regularly.
At the same time, the water temperature of the water bath should be adjusted accordingly.
The compressed air should remove oil and pollutants, and one or more oil traps, oil filters, and chemical filtration devices (such as dry activated carbon and separation
The combination of sub-filters) is treated and replaced or activated regularly. Synthetic air can also be used. The water is preferably distilled or deionized water.
Humid air can be fed into the studio as shown in Figure B.1.In this case, the air in the working room is exhausted by suction, so that
Low air pressure is formed in the working chamber (compared to the space outside the working chamber in the test chamber). The humid air outside the studio is drawn in through a hole
In the working chamber, the size of the aperture affects the pressure difference. Adjust the flow rate of air drawn from the working room to obtain the specified hourly gas volume
Number of replacements. Compared with the air pressure of the surrounding environment, the low air pressure in the working room may cause difficulties in the use of certain gas analysis instruments.
B.3 Studio
The test gas is composed of various chemically active components, so it is easy to be adsorbed, absorbed or combined with the structural materials used in the studio and pipelines.
The material undergoes a chemical reaction. When manufacturing the studio, it is recommended to use glass, polymethylmethacrylate (PMMA), polytetrafluoroethylene (PTFE), poly
Vinylidene fluoride (PVDF) and austenitic stainless steel (containing 18% chromium (Cr), 10% nickel (Ni), and adding molybdenum (Mo), titanium (Ti), niobium)
(Nb) or other corrosion-resistant materials to withstand the corrosion of chloride]. It is usually necessary to add a much higher content of gas, especially chlorine,
In order to obtain the specified gas concentration in the working space. When certain types of stainless steel are used, corrosion of the studio will occur. New equipment required
During the trial period, the gas absorption rate of the test chamber is usually higher during the trial period.
The minimum volume of the studio is recommended to be 0.1m3.
The studio can be any shape. Compared with cube-shaped studios, cylindrical studios generally can get more uniform airflow
And a larger working space (relative to the volume of the entire studio).
The test samples in the studio should only be exposed to sunlight or other light sources occasionally.
The design of the test chamber should ensure that the studio wall and other parts can be easily and thoroughly cleaned. The working chamber wall can be heated to the specified temperature
Temperature or slightly higher temperature to avoid condensation, usually air interlayer (can be an external box) or water interlayer.
The working room should adopt appropriate airtight sealing devices to enable the electrical measurement, electrical and mechanical operations during the test to proceed normally.
The test gas is best introduced from the bottom opening of the test box and discharged from the corresponding top opening. The position in front of the opening can make
Use buffer devices to improve the uniformity of air flow.
The exhaust pipe can be heated to avoid condensation and corrosion.
In order to improve the uniformity of the air flow to meet the requirements in Table 1, the forced gas flow is allowed. The forced flow of gas can be fan or circular
The disk rotating sample holder allows the test sample to move slowly in the test gas. Under normal circumstances, the turbulent gas generated by the fan can accelerate
Corrosion rate, and the uniform gas flow rate produced by the rotating sample holder is limited to a constant diameter. When using a fan or rotating sample holder
When, the heat emitted should be considered. Under normal circumstances, the fan should be installed far away from the test object to avoid the influence of heat emitted.
Depending on the test results, the power device of the rotating sample rack should be installed outside the test box to prevent heat from being dissipated into the working chamber. Before using the equipment,
Investigate the influence of fans and rotating sample holders (see B.7).
B.4 Gas delivery system
Gas transportation systems, pipelines, valves, etc. should not absorb the test gas or the adsorption of the gas should not affect the test results. Teflon
(PTFE) is a commonly used material for pipes. Valves and other parts are usually made of acid-resistant steel, and the steel surface is preferably made of PTFE
Polyethylene (PTFE) coating, especially in humid conditions, chlorine will attack acid-resistant steel.
The gas can be provided by the permeation tube, with pure air, synthetic air or nitrogen as the carrier gas. Another way is to use gas cylinders, preferably
Use diluted gas (usually diluted with nitrogen).
The gas should be clean enough to not affect the test results. It is advisable to use high-purity gas. other reactive gas other than the specified reactive gas
The maximum concentration is 0.1% of the specified active gas concentration. Certain gases such as nitric oxide in nitrogen dioxide are allowed to have a higher concentration, the maximum
Up to 10% of nitrogen dioxide gas concentration.
Regulating the gas flow can use metering pumps, orifice flow meters or mass flow meters. It is recommended to use a mass flow meter to control low concentration
Corrosive gas.
Before the corrosive gas is introduced into the studio, it is best to use a mixing chamber. When various corrosive gases are mixed with each other, the concentration of each corrosive gas
It should be avoided to cause unnecessary chemical reactions between each other.
B.5 Analysis system
B.5.1 Temperature and humidity
Various methods that are not affected by the corrosive gases used can be used to measure temperature and humidity. Temperature and humidity control can be
Perform before mixing corrosive gases. In Figure Bl test equipment, this work can be carried out in the box outside the work room. In this case, Wen
The degree and humidity settings can be adjusted according to the mixing of the diluted corrosive gas. The real temperature and humidity in the working room are compared with those measured outside
The relationship between temperature and humidity should be checked regularly (usually twice a year). The exposure of the instrument to the corrosive environment in the working room should be restricted.
B.5.2 Gas
In order to avoid condensation in the sampling pipes, these pipes can be heated. The relative humidity in the pipeline is allowed up to 80%.
Lower is better.
The possible influence of the pressure difference between the working room and the working room on the function of the gas analysis instrument should be thoroughly checked. Many testing instruments require
Seeking to detect a gas sample consistent with the ambient pressure. When there is negative pressure in the studio, some testing instruments can extract gas from the studio.
Difficulties can occur, which will give too low readings. The pressure in the studio is more easily controlled as a positive pressure, because measures are taken to reduce the pressure to the environment
Stress is easier.
Sulfur dioxide analysis and testing can use fluorescence ultraviolet method, conductivity method and colorimetric method.<......
 
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