1. The materials used to make the salt spray test chamber must be resistant to salt spray corrosion and not affect the test results. 2. The volume of the salt spray test chamber is not less than 0.2m3, preferably not less than 0.4m3. The top of the box should prevent the accumulated solution from dripping onto the sample during the test. The shape and size of the box should be such that the collection speed of the solution in the box conforms to Note 1. 3. The heating system of the salt spray test chamber shall keep the temperature in the chamber up to the provisions of Note 2. The temperature measurement area is not less than 100mm from the inner wall of the box and can be read from outside the box. 4. The spray device includes the following parts: 1. Spray air source: Compressed air should pass through a filter to remove oil for purification; then enter the saturated tower containing distilled water for humidification, and its temperature should be higher than the test temperature in the salt spray box. Finally, it enters the sprayer through the pressure regulating valve, and the pressure should be controlled within the range of 7OkPa ~ 17OkPa. 2. Spray system: composed of sprayer, brine tank and baffle. One or more sprayers can be used. The adjustable baffle prevents salt spray from spraying directly onto the sample. The position of the sprayer and baffle has an effect on the uniform distribution of the salt spray. 3. Brine tank: In order to ensure uniform spraying, there should be a device to maintain a certain liquid level. Adjust the spray pressure, the temperature of the saturated tower water and the position of the baffle so that the settling amount and collection speed of the salt mist in the tank are in accordance with Note 1. 5. Salt spray collector for salt spray test box: At least two collectors are placed in the box, one close to the nozzle and one far from the nozzle. The collector is made of glass and other inert materials and has a funnel shape with a diameter of 10cm and a collection area of ​​about 80cm2. The funnel tube is inserted into a container with a scale, and it is required to collect salt mist instead of liquid dripping from the sample or other parts. 6. Before using different solutions for the test, the salt spray box must be thoroughly cleaned. Before placing the sample, the equipment should be run empty for at least 24 h, and the pH of the collected liquid must be measured to ensure that the pH of the entire spray period is within the specified range. Note 1: The speed of salt fog settling, after 24 hours of spraying, it is l ~ 2ml / h per 80cm2 area; the concentration of sodium chloride is 50g / L ± 5g / L; the pH range is: neutral salt spray test 6.5 to 7.2, acetate spray test is 3.1 to 3.3, copper accelerated acetate spray test is 3.1 to 3.3. Note 2: The temperature in the salt spray box of the neutral salt spray test and the acetate salt spray test is 35 ℃ ± 2 ℃. The temperature in the salt spray box of the copper accelerated acetic acid salt spray test is 50 ℃ ± 2 ℃. During the test, the temperature fluctuation in the entire salt spray box should be as small as possible. Dongguan Qinzhuo Environmental Testing Equipment Co., Ltd. specializes in production and sales: constant temperature and humidity test chamber, high and low temperature alternating humidity and heat test box, high and low temperature box, high temperature oven, electric blast drying oven, cold and hot shock test box, vibration test bench, Drop test benches, aging rooms, salt spray corrosion test chambers, paper packaging test equipment, tensile and electronic wire testing machines, mobile phone notebook testing equipment and other products, and dedicated to develop test equipment for special programs for the majority of users.
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Technical requirements for production of salt spray test chamber