The experimental method of sulfur dioxide test chamber mainly includes the following steps and key points:
1、 Experimental preparation
Equipment inspection: Confirm whether the power and water sources of the test chamber are normal, check the supply system of sulfur dioxide gas, including the pressure of gas cylinders and whether the connections of pipelines are intact, ensure that the display of the control panel is normal, and all function keys can be operated normally.
Sample preparation: Select appropriate material samples, and the shape and size of the samples should meet the standard requirements. Clean the sample to remove surface oil stains and impurities, usually using deionized water for cleaning and drying. Record the initial state of the sample, including surface treatment, appearance, etc.
Solution preparation: Prepare the required sulfur dioxide standard solution or other auxiliary reagents as needed to ensure accurate concentration, and calibrate using standard concentration solutions.
Environmental setting: Add an appropriate amount of deionized water or distilled water at the bottom of the test chamber. The amount of water depends on the volume of the chamber, and the conductivity generally needs to be controlled within a certain range (such as below 0.2 US/m or 500 US/m). Meanwhile, set parameters such as temperature, humidity, and sulfur dioxide concentration according to the experimental requirements.
2、 Experimental operation
Sample placement: Place the cleaned sample in the designated position in the test chamber, ensuring sufficient spacing between the samples to avoid mutual interference. If there are multiple samples, pay attention to marking and recording the position of each sample for subsequent observation and recording.
Start the device: Start the device and start heating and humidifying until the set temperature and humidity are reached. After the environmental conditions stabilize, start injecting sulfur dioxide gas to ensure that the gas flow rate and concentration meet the set values.
Experimental monitoring: During the experiment, regularly check all parameters to ensure that they remain within the set range. Pay attention to the changes in the sample and record any abnormal situations, such as gas leaks, temperature anomalies, etc.
3、 Experimental period and observation
Experimental cycle: A 24-hour test cycle is used, but before each test cycle, it can be continuously exposed in the test chamber for 24 hours, or it can be exposed in the chamber for 8 hours first, and then exposed to the indoor atmosphere for 16 hours. Before the start of every 24-hour test cycle, the water and corrosive gases inside the box must be replaced.
Observation record: Carefully observe the surface of the sample under appropriate light and record any signs of corrosion, such as rust, peeling, discoloration, etc. Take photos to record the appearance changes of the sample, providing a basis for subsequent data analysis.
4、 Experiment completion and data analysis
Experimental end: After the set experimental time is over, close the sulfur dioxide gas valve and stop gas supply. After the concentration of sulfur dioxide gas in the test chamber is reduced to a safe level, open the test chamber door and take out the sample.
Sample processing: After taking out the sample, clean it in a timely manner to avoid secondary contamination by corrosion products. Rinse the sample with deionized water and dry it as needed.
Data analysis: Use measurement tools (such as microscopes, spectrometers, etc.) to further analyze the sample and record data on corrosion rate, depth, etc. Based on the observation results, fill out the test record form to ensure that all data is true and complete. Organize the data recorded during the experimental process, including experimental conditions, sample status, observation results, etc. Electronic spreadsheet software can be used for data analysis, facilitating subsequent statistics and comparisons. Analyze the corrosion situation of the sample to determine the corrosion resistance of the material, and evaluate whether the material meets the usage requirements by comparing it with the standard value.
5、 Experimental report and equipment maintenance
Experimental report: Organize the experimental process, data analysis, and results into a report, including experimental objectives, methods, results, and conclusions. The report should have a clear structure, rigorous logic, and be accompanied by necessary charts and photos to support the conclusions.
Equipment maintenance: After the experiment is completed, promptly clean the residue inside the test chamber and regularly clean and maintain it to ensure that the equipment is in good condition for a long time. Regularly inspect and calibrate gas pipelines and sensors to ensure accurate measurements.