GB/T 2423.33-2021 English PDF (GBT2423.33-2021)

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GB/T 2423.33-2021: Environmental testing - Part 2: Test methods - Test Kca: High concentration sulfur dioxide
GB/T 2423.33-2021
(Environmental Test Part 2.Test Method Test Kca. High Concentration Sulfur Dioxide Test)
ICS 19.040
CCSK04
National Standards of People's Republic of China
Replace GB/T 2423.33-2005
Environmental testing Part 2.Test methods
Test Kca. high concentration sulfur dioxide test
Released on 2021-05-21
2021-12-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅰ
Introduction Ⅱ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Test equipment and materials 1
5 Test procedure 1
6 Intermediate detection 3
7 Final inspection 3
8 Cite the rules that should be given in this document 3
Appendix A (informative) GB/T 2423 constituent document 4
Appendix B (Normative) Corrosion effect inspection of test box 7
Table 1 Test condition 2
Environmental testing Part 2.Test methods
Test Kca. high concentration sulfur dioxide test
1 Scope
This document specifies the general conditions and methods for testing samples in alternating climates with condensed water containing high concentrations of sulfur dioxide, especially
The concentration of sulfur dioxide that is not included in GB/T 9789-2008, so that when testing in different laboratories, you can obtain a comparable
test results.
This document is suitable for determining the suitability of products and materials used in chemically corrosive environments.
The content of this document does not include sample shape, sample preparation and analysis and evaluation of test results. For regulations on these aspects, please refer to the relevant
Standards or negotiate according to specific conditions.
This test cannot be used directly for the comparison of corrosion resistance, unless the application environment of the anti-corrosion system is similar. Because the corrosion test conditions are
There are great differences in the international application conditions, resulting in different corrosion processes and corrosion mechanisms.
2 Normative references
The contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations
Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to
This document.
GB/T 2421-2020 Environmental Test Overview and Guidelines
GB/T 5213-2019 Cold rolled low carbon steel plate and steel strip
GB/T 9789-2008 Metal and other inorganic coatings, sulfur dioxide corrosion test under normal condensation conditions
GB/T 16545-2015 Corrosion of metals and alloys. Removal of corrosion products on corrosion samples
3 Terms and definitions
There are no terms and definitions that need to be defined in this document.
4 Test equipment and materials
See Chapter 3 of GB/T 9789-2008.
The corrosion effect inspection of the test box shall be in accordance with Appendix B.
5 Test procedure
5.1 Overview
If this test does not specify the concentration, it is carried out according to test Kca1.
In the same test equipment, samples to be tested at the same time should preferably have the same anti-corrosion system, because the phases between samples of different anti-corrosion systems
Interaction is inevitable. When testing different anti-corrosion systems at the same time, and when the materials are different, it is necessary to consider that they are subject to
The effects of sulfur dioxide are often different.
5.2 Specimen and pretreatment
According to GB/T 9789-2008 Chapter 4 and relevant regulations.
5.3 Initial inspection
Appearance inspection and/or electrical and mechanical performance testing shall be carried out on the samples according to the requirements of relevant specifications.
5.4 Sample exposure method
According to GB/T 9789-2008 Chapter 5 and relevant regulations.
5.5 Test conditions
The sample should be placed in the test box in the unpackaged, unpowered, "ready to use" state, or in the state specified by the relevant specifications.
The test conditions are shown in Table 1.The test conditions listed in Table 1 are partly different from those in GB/T 9789-2008.But when testing, still have to
Consider 6.1, 6.2 and 6.4 of GB/T 9789-2008.
Note. Most of the sulfur dioxide gas introduced at the beginning of the first test phase quickly dissolves into the water at the bottom of the test chamber. Therefore, the sulfur dioxide in the gas space
The effective concentration is about one-seventh of the theoretical concentration. During the first experimental phase, this initial concentration did not remain constant, but was first sharp.
Ground, and then slowly lowered.
At the beginning of the second stage of the test, the heating should be stopped, and the test box should be opened or ventilated. After about 1.5h, it should meet the requirements of Table 1.
The test conditions given in.
Table 1 Test conditions
5.6 Test time
Unless otherwise specified, the test cycle should be preferentially selected from the following cycles. 1, 2, 5, 10, 15 or 20 cycles, one cycle is 24h.
If corrosion damage has occurred during the test to an unacceptable degree, that is, the appearance or function of the sample has been damaged, the test can be terminated.
Generally, the water and sulfur dioxide gas in the test system should be replaced at the end of each cycle, and the replacement should not interfere with the sample.
6 Intermediate detection
The relevant specifications may stipulate that the electrical and/or other properties of the sample shall be carried out in the test chamber within 3h before the end of each cycle during the test period.
Can detect. After the performance test, it is allowed to open the test box to take and place the sample, and the opening time should be as short as possible, and it should be completed within 0.5h before the temperature rise.
7 Final inspection
7.1 Electrical performance test
If there are no other provisions, the electrical performance test of the sample can be carried out within 3h before the end of the last cycle of the test.
7.2 Visual inspection and other performance testing
The visual inspection and other performance testing of the sample can be carried out in the normal test specified in 4.3 of GB/T 2421-2020 after the end of the test.
Recover under atmospheric conditions for 1h~2h before proceeding.
8 The detailed rules that should be given in quoting this document
When the relevant specifications adopt this test method, specific provisions should be made for the following items.
a) Test name (see Table 1);
b) Initial inspection (see 5.3);
c) Test time (see 5.6);
d) Intermediate testing (see Chapter 6);
e) Final inspection (see Chapter 7).
Appendix B
(Normative)
Corrosion effect inspection of test chamber
B.1 Overview
In order to ensure the reproducibility and repeatability of the test results obtained from one or several similar test equipment, performance inspections should be carried out.
The regulations in B.2~B.7 are applicable to test chambers with a volume of 300L.
B.2 Sample
B.2.1 Choose 5 samples, the size of each sample is 100mm in length, 50mm in width, 0.6mm~1.5mm in thickness, and the material is GB/T 5213-
The surface quality specified in.2019 is a steel plate with FD grade grade of DC04.
B.2.2 In order to meet the requirements of the total exposed area of the tested sample (see 5.4 of GB/T 9789-2008), select 2 blank samples, each
The size of the sample is 400mm in length, 250mm in width and 1mm in thickness, and the material is the same as listed in B.2.1.
B.3 Preparation of samples
Before the performance test, the sample specified in B.2 should be tested with petroleum solvent or other suitable solvent, and a soft cloth or brush without fiber.
The product is degreasing treatment, and then the sample specified in B.2.1 is weighed with a balance to the nearest 1mg. If you can’t immediately after degreasing
For weighing, the sample should be placed in the desiccator until it can be weighed.
B.4 Test procedure
Hang 5 specimens vertically in the test box, and at the same time hang 2 blank specimens vertically on both sides of the test box.
The test conditions specified in GB/T 9789-2008 are subjected to a 5-cycle alternating test.
B.5 Corrosion effect inspection
After the test, you can use hydrochloric acid with a density of 1.10g/mL and 3.5g/L of hexamethylenetetramine with corrosion inhibitory effect (density
1.19g/mL chemically pure hydrochloric acid 500mL plus deionized water to make 1L solution), clean the sample at a temperature of 18℃~28℃
The corrosion products. Other methods for removing corrosion products on the specimen specified in GB/T 16545-2015 can also be used.
After removing the corrosion products, rinse the sample thoroughly in distilled or deionized water, then dry, and then place it at 18°C~28°C
In a desiccator at room temperature until weighed.
B.6 Weighing of the sample
Weigh the sample to the nearest 1 mg.
B.7 Evaluation of inspection results
The mass loss of the sample is expressed by weight loss per unit area, and the unit is g/m2.The average value is between 100g/m2~150g/m2.single
The value must not deviate by more than 20% from the average.