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2023-03-27 0 Views

How to perform standard salt spray test chamber operation

Salt spray test chamber is used to determine the corrosion resistance of the surface of metal or some galvanic materials and evaluate the corrosion resistance of the metal or galvanic surface according to the results of the salt spray test chamber test. The salt spray test examines the corrosion resistance of the test material by observing the corrosion of the test object. In addition, the salt spray test chamber can also be used for harmful gas tests, and the possible uses are diverse. w78Textile Testing Instruments, Testing Equipment Manufacturer

The salt spray test chamber is used for testing the corrosion resistance and film thickness of some metals, alloys, metal coating, oxide coating, organic coating, paint, varnish, etc. After adding the salt spray test chamber with the function of switching high and low temperature, it can simulate the environment of sudden high and low temperature changes and salt sprayconduct rust corrosion tests on experimental materials under different temperature changes. The test equipment is carried out by the Ruili salt spray test chamber, which provides saline preparations. The salt spray test chamber can set a continuous spray time and various experimental project groups. w78Textile Testing Instruments, Testing Equipment Manufacturer

w78Textile Testing Instruments, Testing Equipment Manufacturer

How to operate the salt spray test chamber?

1. Please connect the power of the salt spray chamber and the air compressor, and connect the air line.
2. Fill pure water or distilled water into the tank and the water inlet on the back of the tank until the low water indicator on the control panel goes off, otherwise it will not work normally.
3. The connection of the drain pipe and exhaust pipe is completed. As shown in the previous page, the gauge is open to the left.
4. Fill the insulating container up to the position of the base plateWater to avoid salt spray leakage.

5. Test Solution Preparation Procedure:
A. Top Coat, Neutral Salt Spray (NSS) Test
a. Saline solution with sodium chloride (chemically pure, analytically pure) and distilled water or deionized water, the concentration is (5% ± 0.1)﹪ (mass percent). The liquid collected after atomization must not be reused, except for the rear part of the vane; b. The pH of the salt solution before atomization is between 6.5~7.2 (35±2℃). Chemically pure dilute hydrochloric acid or caustic soda can be used to adjust the pH when preparing brine, but the concentration must still meet the requirements of point a.

B. Metal Coating, Copper Accelerated Acetic Acid Salt Spray Test (CASS Test)
a. Dissolve sodium chloride in distilled water or deionized water, the concentration is 50±5g/L.b. Add cupric chloride (CuCl2·2H2O) to the solution of a and its concentration is 0.26 ± 0.02 g/L (ie 0.205 ± 0.015 g/L anhydrous copper oxide).
c) Add an appropriate amount of glacial acetic acid to solution a to ensure the pH of the salt mist collector solution in the test chamber is 3.1-3.3. Generally, if the pH of the solution before spraying is 3.0-3.1, the pH of the collected solution will be in the range of 3.1-3.3. Use a pH meter to measure the pH of the solution, or you can use a precision pH test paper calibrated by the pH meter and read a 0.1 change in pH as a daily test can. The pH of the solution can be adjusted with glacial acetic acid or sodium hydroxide.
D. To avoid nozzle clogging, the solution should be filtered beforehand.

6. Pour salt water into the saline supplement bottle, that is, fill the salt water automatically into the spray tower in the laboratory, so that the liquid medicine flows to the salt spray tower.
7. Fill the wet-bulb cup with water, cover the wet-bulb thermometer with gauze, and place the end of the gauze in the wet-bulb cup.
8. Place the test piece or sample on the shelf: The angle of the arrangement needs to be set up according to the required standard, for example, the standard test piece 130×70 (mm) can be tilted 15 degrees or 30 degrees.

9. Set test temperature: set to desired standard (“▲” key to increase, “▼” key to decrease)
a, NSS, AAS test: laboratory temperature 35 °C, drum temperature with saturated air 37 °C (35 °C - 40 °C). b. CASS test: the temperature of the laboratory is 50℃, the temperature of the barrel of saturated air is 55℃ (50℃~55℃).

10. Set the test time: 0~999 hrs (H: hour; + button to increase; - button to decrease)
11. Presspress the on/off button, press the button, preheat first to reach the set temperature. Note: The test cover must be closed and handled carefully 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 0.2~0.4Mpa primary pressure;
b Set the pressure control valve to a pressure of 0.07-0.17Mpa, the pressure can be read from the pressure gauge (clockwise increasing, counterclockwise decreasing).

13. Press the timing button to count the time according to the set time.
14. After the test is complete, turn off each switch in turn.
15. If there is any abnormal phenomenon during the test, please refer to the functional abnormality assessment table to deal with it. w78Textile Testing Instruments, Testing Equipment Manufacturer