Test Overview
Gas corrosion testing is used to determine the suitability of products for operation and storage in atmospheric environments, especially contacts and connectors. The main factors affecting corrosion include temperature and humidity, and atmospheric corrosive components. The severity of the test depends on the type of corrosive gases and the duration of exposure.
Gas corrosion testing uses gases such as sulfur dioxide (SO₂), nitrogen dioxide (NO₂), chlorine (Cl₂) and hydrogen sulfide (H₂S) to accelerate the corrosion of materials or products under controlled temperature and relative humidity, reproducing the degree of damage that materials or products suffer over a given period of time. It is also used to compare the process quality of similar protective coatings, and to determine the corrosion resistance of the protective coatings of parts, electronic components, metal materials, electrical and electronic products, as well as industrial products, in mixed gases.
Corrosive Gases
The concentrations of gases such as H₂S, NO₂, Cl₂ and SO₂ in the atmosphere are relatively low, but these gases interact with each other to form strong acids, creating a “multiplication effect” that accelerates the corrosion of electronic components. The strong acids formed by gas chemical reactions include nitric acid (HNO₃) and hydrochloric acid (HCl), along with the formation of moisture.
Characteristics of corrosive gases
Application Scope
1. Automotive: automotive equipment and devices, automotive parts, etc.;
2. Computers: computers, displays, mainframes, computer components, medical equipment and other precision instruments;
3. Electronic communications: mobile phones, RF devices, electronic communication components, PCB, PCBA;
4. Electrical appliances: home appliances, lamps, transformers and other household electrical equipment, instruments and meters, medical devices.
Test Procedure
1. Specimen preparation: Select material samples that meet the standards as required. The size and shape of the specimens are adjusted according to the different corrosion tests.
2. Test environment setup: Build the required gas environment and control parameters such as temperature and humidity to ensure the accuracy of the test results.
3. Test operation: Place the specimens in the specific gas environment and set the required test duration and test conditions according to the test requirements.
4. Evaluation of test results: Based on the test results, the degree of corrosion of materials in different gas environments can be evaluated and detailed reports generated.
Reference Standards
IEC 68-2-60 Test method Ke: Corrosion testing in artificial atmospheres at low concentrations of polluting gases
EN 60068-2-60 Environmental testing — Part 2-60: Tests — Test Ke: Flowing mixed gas corrosion test
GB 2423.19-2013 Sulfur dioxide corrosion test for contacts and connections
GB/T 2423.20-2014 Hydrogen sulfide corrosion test for contacts and connections
EN 60068-2-60-1996 Environmental testing — Part 2-60: Test methods — Test Ke: Flowing mixed gas corrosion test
GB/T 2423.51-2020 Environmental testing for electric and electronic products, Test Ke: Flowing mixed gas corrosion test
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