GB/T 2423.33-2021

Environmental testing—Part 2: Test methods—Test Kca: High concentration sulfur dioxid (English Version)

GB/T 2423.33-2021
Standard No.
GB/T 2423.33-2021
Language
Chinese, Available in English version
Release Date
2021
Published By
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest
GB/T 2423.33-2021
Replace
GB/T 2423.33-2005
Scope
This document specifies the general conditions and methods for testing samples in condensed water with high concentrations of sulfur dioxide in alternating climates, especially for sulfur dioxide concentrations not included in GB/T9789-2008, so that when testing in different laboratories, Comparable test results can be obtained. This document is intended for use in determining the suitability of products and the materials used in them for use in chemically aggressive environmental conditions. The content of this document does not include the analysis and evaluation of sample shape, sample preparation and test results. Regarding the regulations in these aspects, you can refer to relevant standards or negotiate according to specific circumstances. This test cannot be used directly for comparison of corrosion resistance, unless the application environment of the corrosion protection system is similar. Because the corrosion test conditions are very different from the actual application conditions, the corrosion process and corrosion mechanism are different.
Introduction

Analysis of the core content of the standard

GB/T2423.33-2021 specifies the test method in an alternating climate of condensed water containing high concentration of sulfur dioxide, which is suitable for evaluating the adaptability of products and materials in chemically corrosive environments. Compared with the 2005 version, the main technical changes include:

Comparison dimensions 2005 version 2021 version
Test steel plate standard A3 steel plate + No. 0 sandpaper DC04 steel plate (GB/T5213-2019 FD grade)
Test cycle Fixed cycle Add 1, 2, 5, 10, 15, 20 cycles as options
SO₂ concentration control Single concentration It is divided into two levels: Kca1 (0.33%) and Kca2 (0.67%)

Key requirements for test equipment

The standard clearly specifies the test chamber:

  • When the volume is 300L, it is necessary to maintain 2L of water
  • Temperature control accuracy is ±3℃
  • Relative humidity in the first stage is 100% (condensed water is generated)
  • Corrosion effect inspection requires a weight loss per unit area of 100-150g/m²

Application case: wind power equipment testing

An offshore wind power converter uses Kca2 test (0.67%SO₂), after 10 cycles of testing:

  1. Corrosion spots of 3mm² appeared on the shell coating
  2. Conductivity of the terminal decreased by 12%
  3. According to GB/T16545-2015, the corrosion products were removed and the material was confirmed to meet the standards

Implementation suggestions

1. Sample preparation

Strictly follow the requirements of Appendix B:

  • Main sample size 100×50×（0.6-1.5）mm
  • Blank sample size 400×250×1mm
  • After degreasing, it is necessary to weigh with a precision of 1mg

2.

Critical Control Points:

  1. SO₂ gas should be introduced in a concentrated manner at the beginning of the test
  2. The second stage needs to complete cooling and ventilation within 1.5 hours
  3. The intermediate test should be completed within 3 hours before the end of the cycle

3. Result Determination

Recommended combination:

  • Mass loss rate (Appendix B requirements)
  • Appearance changes (GB/T9789-2008)
  • Electrical performance attenuation value (product specification)

GB/T 2423.33-2021 Referenced Document

  • GB/T 16545-2015 Corrosion of metals and alloys.Removal of corrosion products from corrosion test specimens
  • GB/T 2421-2020 Environmental testing—General and guidance
  • GB/T 5213-2019 Cold rolled low carbon steel sheet and strip
  • GB/T 9789-2008 Metallic and other non-organic coatings.Sulfur dioxide test with general condensation of moisture

GB/T 2423.33-2021 history

  • 2021 GB/T 2423.33-2021 Environmental testing—Part 2: Test methods—Test Kca: High concentration sulfur dioxid
  • 2005 GB/T 2423.33-2005 Environmental testing for electric and electronic products Part 2:Test Method Test Kca:High concentration sulfur dioxide
  • 1989 GB/T 2423.33-1989 Basic environmental testing procedures for electric and electronic products--Test Kca: High consistence sulphur dioxide test

GB/T 2423.33-2021 -All Parts

GB/T 2423.1-2008 Environmental testing for electric and electronic products.Part 2:Test methods.Tests A:Cold GB/T 2423.10-2019 Environmental testing—Part 2:Test methods—Test Fc:Vibration(sinusoidal) GB/T 2423.101-2008 Environmental testing for electric and electronic products.Part 2:Test methods.Test: Inclinations and swings GB/T 2423.102-2008 Environmental testing for electric and electronic products.Part 2:Test method.Test:combined temperature(cold and heat)/low air pressure/vibration(sinusoidal) GB/T 2423.11-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fd: Random vibration wide band--General requirements GB/T 2423.12-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fda: Random vibration wide band--Reproducibility high GB/T 2423.13-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fdb: Random vibration wide band--Reproducibility medium GB/T 2423.14-1997 Environmental testing for electric and electronic products. Part 2: Test methods. Test Fdc: Random vibration wide band--Reproducibility low GB/T 2423.15-2008 Environmental testing for electric and electronic products.Part 2:Tests methods.Test Ga and guidance:Acceleration,steady GB/T 2423.16-2022 Environmental testing—Part 2: Test methods—Test J and guidance: Mould growth GB/T 2423.17-2024 Environmental testing Part 2: Test methods Test Ka: Salt spray GB/T 2423.18-2021 Environmental testing—Part 2: Test methods—Test Kb:Salt mist, cyclic（sodium chloride solution） GB/T 2423.19-2013 Environmental testing.Part 2:Test methods.Test Kc:Sulphur dioxide test for contacts and connections GB/T 2423.2-2008 Environmental testing for electric and electronic products.Part 2:Test methods.Tests B:Dry heat GB/T 2423.20-2014 Environmental testing.Part 2: Test methods.Test Kd: Hydrogen sulphide test for contacts and connections GB/T 2423.21-2008 Environmental testing for electric and electronic products.Part 2 Test methods Test M:Low air pressure GB/T 2423.22-2012 Environmental testing.Part 2:Test methods.Test N:Change of temperature GB/T 2423.23-2013 Environmental testing.Part 2:Test methods.Test Q:Sealing GB/T 2423.24-2022 Environmental testing—Part 2: Test methods—Test S: Simulated solar radiation at ground level and guidance for solar radiation testing and weathering GB/T 2423.25-2008 Environmental testing for electric and electronic products.Part2:Tsets Tset Z/AM:Combined cold/low air pressure tests GB/T 2423.26-2008 Environmental testing for electric and electronic products.Part 2 Test methods TestZ/BM:Combined dry heat/low air pressure tests GB/T 2423.27-2020 Environmental testing—Part 2: Test methods—Test method and guidance: Combined temperature or temperature and humidity with low air pressure tests GB/T 2423.28-2005 Environmental testing for electric and electronic products.Part2:Test methods-Test T:Soldering GB/T 2423.29-1999 Environmental testing for electric and electronic products-- Part 2:Test methods Test U:robustness of terminations and integral mounting devices GB/T 2423.3-2016 Environmental testing—Part 2：Testing method—Test Cab:Damp heat,steady state


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