The use of salt spray test chamber salt spray tester, also known as salt spray test chamber for artificial climate environment "three defenses" (damp heat, salt spray, mold) test equipment, is the research machinery, defense industry, light industry and electronics, instrumentation An important test equipment for various environmental adaptability and reliability of the industry. The performance index meets the requirements of GB/T 5170.8 “Methods for Verification of Basic Parameters of Environmental Testing Equipment for Electrical and Electronic Products”. According to GB/T2423.17 "Electrical and electrical products basic environmental testing procedures test Ka: salt spray test method" for neutral salt spray test can also be used for acetate spray test. Suitable for salt spray corrosion tests on parts, electronic components, metal layers, and industrial products.
The procedure for using the salt spray tester is as follows:
Pre-test preparation:
1. Add distilled or deionized water to the heated water tank at the bottom of the studio to prevent cracking and aging of the cabinet when heated.
2. The water seal tank around the upper part of the box should be filled with proper amount of distilled water or deionized water. It should not be too full, and should not be too small. When closing the lid, neither water nor salt spray should be spilled.
3. Add distilled or deionized water to the air saturator (stainless steel barrel). Open the water saturator (shown in Figure 1) before opening the bleed valve and saturator water valve. Wait until the water level is 4/5 of the water level glass box. It is advisable to close the purge valve and close the saturator fill valve when added to the specified water level. Due to long-term tests, the saturator water vapor is consumed. When the water level is reduced to 2/5, the water should be replenished in time to prevent the heating tube from being burned due to lack of water, and the saturator and internal heating point components should be battered.
4. Check whether the water pipe between the water storage tank and the spray chamber in the working chamber is in good condition. Add the prepared salt solution (usually prepared at a concentration of 5%) into the water storage tank.
5. Check the status of the exhaust pipe in the rear of the cabinet for fogging; if the air pipe falls off or if the outlet is open to the sewer; if the pipe is blocked, avoid affecting the salt spray.
6. Raise the funnel inside the box and check whether the connecting pipe between the funnel and the mist collector is smooth and intact. Do not affect the collection of salt fog settlement.
7. Check the connecting pipe between the air source and the saturator; if the connecting pipe of the air source and the atomizer falls off, prevent the gas from spilling or the shortcomings of insufficient air supply.
8. Open the lid, place the sample on the sample rack in the working chamber (10% from the surrounding chamber wall), maintain a certain distance between the sample and the sample, expose the surface area of ​​the sample to >98%, and close the lid.
1. Please turn on the power of the salt spray box and the air compressor and connect the air hose.
2. Add purified water or distilled water to the inlet of the tank and the back of the tank, until the low water level on the panel turns off, otherwise it will not work properly.
3. The connection between the drain pipe and the exhaust pipe is completed. As shown on the previous page, the indicator is turned left.
4. Add water from the sink to the backing plate to prevent salt spray leakage.
5. Preparation of test solution modulation method:
A. Overlay, Neutral Salt Spray Test (NSS Test)
a. The salt solution is formulated with nacl (chemically pure, analytically pure) and distilled or deionized water at a concentration of (5% ± 0.1)% (mass percentage). After atomization, the collected liquid shall not be reused except for the baffle;
b. The pH of the salt solution before atomization is between 6.5 and 7.2 (35±2°C). When preparing the salt solution, chemically pure dilute hydrochloric acid or sodium hydroxide solution can be used to adjust the pH, but the concentration must still meet the requirements of point a.
B. Metal Covering, Copper Accelerated Acetate Spray Test (CASS Test)
a. Dissolve nacl in distilled or deionized water at a concentration of 50 ± 5g/L.
b. Copper chloride (CuCl2.2H2O) is added to solution a at a concentration of 0.26±0.02 g/L (ie, 0.205±0.015 g/L anhydrous copper chloride). c. Add an appropriate amount of glacial acetic acid to the a solution to ensure that the pH of the salt spray collection solution in the chamber is 3.1-3.3. For example, if the pH of the solution before spraying is 3.0-3.1, the pH of the collected solution is generally in the range of 3.1-3.3. The pH of the solution can be measured with an acidometer. Precision pH test paper calibrated with a pH meter and capable of reading 0.1 pH changes can also be used as a routine test. The pH of the solution can be adjusted with glacial acetic acid or sodium hydroxide.
d. To avoid nozzle clogging, the solution must be filtered before use.
6. Pour salt water into the saline replenishment bottle, that is, automatically fill the brine into the laboratory spray tower and allow the solution to flow to the salt spray tower.
7. Add water to the wet bulb. The wet bulb thermometer covers the gauze. The end of the gauze is placed in the wet bulb.
8. Place the test piece or sample on the rack: Place the angle according to the required standard. For example, the standard test piece 130×70 (mm) can be set at 15° and 30°.
9. Set the test temperature: set according to the required standard (press "â–²" for increase, press "â–¼" for decrease)
a. NSS, AASS test: test chamber temperature 35 °C; saturated air barrel temperature 37 °C (35 °C ~ 40 °C).
b. CASS test: test chamber temperature 50 °C; saturated air barrel temperature 55 °C (50 °C ~ 55 °C).
10. Set the test time: 0 ~ 999Hr (H: hour; press "+" for increase; press "-" for decrease)
11. Press the power, operate the button, pre-heat, reach the set temperature. Note: The test cap needs to be covered and carefully handled to avoid damage.
12. Press the spray button:
a. Open the air outlet valve in front of the air compressor and adjust the pressure to a pressure of 0.2-0.4 MPa;
b. Adjust the pressure regulator valve to a pressure of 0.07 to 0.17 MPa. The pressure can be known from the pressure gauge (clockwise increase, counterclockwise decrease).
13. Press the timer button, according to the time set by the time.
14. After the test is completed, the switches are turned off in order.
15. If there is any abnormality in the test, refer to the function abnormality judgment table.
Acceptance and implementation standards:
It can meet the test requirements of GB9789-88 "Corrosion Test for Contamination of Metals and Other Non-Metallic Organic Coatings".
Pressure adjustment:
a: The inlet pressure is manually adjusted by the first stage pressure regulator, generally controlled at 2~4kg/cm2
b: The spray pressure is adjusted to 0.5~1.7kg/cm2 by the pressure reducing valve. The adjustment of Syrian has been adjusted before leaving the factory. The user generally does not need to adjust.