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GB/T 2423.17-2008 English PDF (GBT2423.17-2008)

GB/T 2423.17-2008 English PDF (GBT2423.17-2008)

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GB/T 2423.17-2008: Environmental testing for electric and electronic products - Part 2: Test method - Test Ka: Salt mist

GB/T 2423.17-2008
Envrionmental testing for electric and electronic products.Part 2. Test method.Test Ka. Salt mist ICS 19.020
K04
National Standards of People's Republic of China
GB/T 2423.17-2008/IEC 60068-2-11. 1981
Replacing GB/T 2423.17-1993
Environmental testing of electrical and electronic products
Part 2. Test Method Test K a. Salt Fog
(IEC 60068-2-11. 1981, Basicenvironmentaltestingprocedures-
Part 2. tests-TestKa. Saltmist, IDT)
Released in.2008-05-19
2009-01-01 Implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People 's Republic of China China National Standardization Management Committee released
Directory
Preface I
1 range 1
2 test equipment 1
3 salt spray 1
4 initial detection 2
5 pretreatment 2
6 condition test 2
7 recovery 2
8 Final Test 3
9 Test Report 3
Details given in the relevant specification
GB/T 2423.17-2008/IEC 60068-2-11. 1981
Preface
This part is part 17 of GB/T 2423.
This part is equivalent to IEC 60068-2-11. 1981 "Basic Environmental Test Procedure Part 2. Test Test Ka. Salt Spray" (English Version). Mainly made the following editorial changes.
- the preamble and the introduction of the international standard;
--- increase the national standard preface;
Consolidated Chapter 1 and Chapter 2 of the International Standard.
This part of the replacement GB/T 2423.17-1993, compared with its main differences are. --- clear the purity of the use of sodium chloride requirements;
The concentration of salt solution was changed from the original (5 ± 0.1)% to (5 ± 1)%; - increased the time required for solution concentration and pH measurement; --- increased the requirements for the test report.
This part of the National Electrical and Electronic Product Environmental Conditions and Environmental Testing Standardization Technical Committee proposed and centralized. This part of the drafting unit. China Electric Apparatus Research Institute, Shanghai Industrial Automation Instrumentation Institute. This part of the main drafters. Yan Jinglian, Wang Jie.
This part of the standard replacement of the previous version of the release. GB/T 2423.17-1981, GB/T 2423.17-1993. GB/T 2423.17-2008/IEC 60068-2-11. 1981
Environmental testing of electrical and electronic products
Part 2. Test Method Test K a. Salt Fog
1 range
This test is applicable to the ability to compare salt spray corrosion with similar structures. This test is also applicable to assessing the quality and uniformity of protective coatings. When using, the following restrictions should be considered.
A) This test is not suitable as a common salt spray corrosion test;
B) This test does not apply to the evaluation of individual specimens used in salt atmospheres. For equipment and components, Test Kb provides more realistic test conditions and a single sample evaluation method. but If, in some cases, in order to ensure quality, the relevant specification requires individual samples to use this test method, the sample should be used as an entire component or The components of the equipment are tested together with the actual protective equipment (box, lid, jacket, etc.). 2 test equipment
2.1 test chamber
The material used in the test chamber should not affect the corrosion effect of salt spray. The structure of the chamber and the method of providing the salt spray may be different, but the following conditions must be met. A) the conditions in the test chamber are maintained within the specified tolerances; B) The test chamber shall be of sufficient capacity to provide a stable, uniform test condition (free from turbulence) and These conditions are not affected by the sample;
C) salt spray can not be sprayed directly onto the sample;
D) the condensate of the top of the tank, the wall of the box or other parts can not be dropped onto the specimen; E) The test chamber should be vented to prevent the pressure from rising to ensure uniform distribution of salt mist. The end of the vent should be wind protected to avoid lead From the test chamber to produce a strong air.
2.2 spray device
The design and composition of the spray device should be capable of producing fine, wetted, dense fog, the material of the spray device can not occur with the salt solution reaction.
3 salt spray
3.1 salt solution
3.1.1 Concentration
The salt used in the test should be of high quality sodium chloride. When dried, the sodium iodide content does not exceed 0.1% and the total content of the impurities does not exceed 0.3%.
The concentration of the salt solution should be (5 ± 1)% (mass ratio). The solution should be prepared by dissolving (5 ± 1) parts of the salt at a mass of 95 parts of distilled water or deionized Water.
3.1.2 pH value
When the temperature is (35 ± 2) ℃, the pH value of the solution should be within 6.5 ~ 7.2. In conditional tests, the pH should be maintained within this range. Hydrochloric acid or sodium hydroxide can be used under the premise of ensuring the concentration of sodium chloride GB/T 2423.17-2008/IEC 60068-2-11. 1981
Adjust the pH value.
Each batch of newly configured solution should be measured at pH.
The pH may need to be adjusted to meet the requirements of Chapter 6 within the above specified range. 3.1.3 The solution after spraying can not be used again.
3.2 Air supply
The compressed air entering the spray device should not contain any impurities, such as oil, dust and so on. Should take measures to make the compressed air humidity and temperature to meet the requirements of operating conditions. The air pressure should be suitable for producing small, wet, dense Set the fog.
In order to prevent salt deposition from clogging the spray device, it is recommended that the air relative humidity at the nozzle be at least 85%. A viable method is as follows. Let the air flow in a very small form of bubbles by automatically maintaining a constant hot water tower with a water temperature of at least 35 ° C. The permissible water temperature increases as the air flow increases and the test chamber and its ambient thermal insulation decrease. Water temperature should not be too high, so as not to bring too much water into the test chamber, can not exceed the specified operating temperature. 4 initial detection
Specimens shall be visually inspected and, if necessary, electrical and mechanical performance tests shall be carried out in accordance with the relevant standards. 5 pretreatment
The relevant standard shall specify the cleaning procedure used for the specimen prior to testing and specify whether the protective coating needs to be removed. Note. The cleaning method should not affect the effect of salt spray on the corrosion of the specimen and can not introduce any secondary corrosion. Try to avoid contact with the sample surface before testing.
6 condition test
6.1 According to the relevant specifications, the sample should be tested in normal use. Therefore, the sample should be divided into multiple batches, each batch according to one Use the state to test.
There should be no contact between the specimens, and can not contact with other metal parts, so the sample should be placed to eliminate the impact between the components. Note. The position of the specimen in the test chamber (ie, the specimen surface with the vertical plane of the tilt angle) is very important, the location of a very small difference may lead to poor results Do not be bigger, depending on the shape of the specimen.
6.2 The temperature of the test chamber shall be maintained at (35 ± 2) ° C. 6.3 All exposed areas should be maintained in salt spray conditions, with an area of 80cm2 containers in the exposed area at any point continuously collected to Less 16h of the atomization deposition solution, the average collection per hour should be between 1.0mL ~ 2.0mL. At least two collection containers should be used, The position of the vessel should not be shielded by the sample to avoid collection of the solution on the sample, and the solution in the vessel can be used to test the pH And concentration.
The collection of the solution may be carried out before or during the test in accordance with 6.5. 6.4 The concentration and pH should be in accordance with 3.1.1 and 3.1.2, respectively, when measured at (35 ± 2) ° C according to the solution collected in 6.3. 6.5 The measurement of concentration and pH should be made within the following time. A) For continuous use of the test chamber, after each test should be measured during the test solution to be measured; B) For non-continuous use of the test chamber, before the start of the test should be 16h ~ 24h test run. After the trial run, in the sample Measure immediately before starting the test. In order to ensure stable test conditions, it should also be measured in accordance with a). 6.6 The relevant specification should specify the test cycle. 16h, 24h, 48h, 96h, 168h, 336h, 672h. 7 recovery
After the end of the test, unless the contrary provisions, a small sample should be washed in tap water for 5min, and then rinse with distilled water or deionized water, Then shake or dry with air to remove water droplets.
GB/T 2423.17-2008/IEC 60068-2-11. 1981
The temperature of the cleaning water should not exceed 35 ° C.
If necessary, the relevant specification shall specify the cleaning and drying methods for larger specimens. The specimen shall be placed under standard recovery conditions for not less than 1 h and no more than 2 h. 8 final detection
Specimens shall be visually inspected and, if necessary, electrical and mechanical performance tests shall be carried out in accordance with the relevant specifications and the test results shall be recorded. Note. It should be noted that the remaining salt deposition does not destroy the reproducibility of the measurement results. 9 Test Report
The report should include the information needed to compare the sample. In addition, the sample exposure period and the position within the chamber should also be included. The report should also include measurements of concentration and pH.
10 The details given in the relevant specification
Terms
Initial Detection Chapter 4
Pretreatment Chapter 5
Position of sample in test 6.1
Test period 6.6
Recovery Chapter 7
Final Test Chapter 8
GB/T 2423.17-2008/IEC 60068-2-11. 1981

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