The salt spray test machine is suitable for surface treatment of various materials, including paint, electroplating, organic and inorganic coatings, anode treatment, anti-rust oil and other re-treatments to test the corrosion of its products. The "five organs and six organs" commonly known as the salt spray machine are mainly composed of: a box, a spray device, a nozzle, a liquid supply pipe, a compressed air supply pipe and a device for humidifying the air and supporting the sample.
Cabinet: The salt spray test cabinet needs to be able to be heated, and it needs to maintain pressure balance, and it needs to install measurement and control sensors to control the test temperature. The SS and ASS tests in the closed cabinet are (35 ± 2) ℃, The CASS test is (50 ± 2) ℃. The test container requires a minimum volume of 400 liters, and can ensure that the sprayed condensed droplets will not drip from the top or the side wall and hinder the sample from contacting the spray. After the spray, the test solution cannot be repeated Use. The effective space of the test is limited to the part outside the nozzle in the box, and there is a uniform spray diffusion range that can be verified.
Nozzle: The nozzle for manufacturing the spray should be made of polypropylene glass or stainless steel. If other materials are used, it must meet the specifications in the standard. The diameter of the nozzle is 1 mm, the spray diffusion angle is 30 degrees, and the standard pressure of the nozzle is 0.7-1.4bar , The distance between the nozzle and the liquid surface is 200-500mm, and it proves to be effective. Monitor this equipment to ensure that the hourly spray is controlled within the specified limit. The spray port can be monitored using a flow sensor method. If there is more than one nozzle, each nozzle Both require special flow and control sensors. The spray cannot be directed at the sample and needs to be sprayed against the barrier or the instrument wall. If the spray head is at the bottom, spray upward. Example 1 spray can only be carried out in a large-capacity instrument. Make sure that no sample is placed above the spray head. You need to select the number and arrangement of spray ports to ensure that the standard meets the standard specifications.
Liquid supply pipe: a container for storing test solution for spraying needs to be designed to keep the head of the pump constant during the test.
Compressed air supply duct and air humidification: an air humidifier needs to be designed to ensure that the compressed air is filled with water at the required temperature during the test. The duct between the nozzle and the compressed air should have a pressure standard to monitor the nozzle Air pressure.
Device for supporting the sample: Fix the sample with a bracket to keep it in the salt spray area and ensure that it does not contact with each other, thereby eliminating the possibility of contact corrosion, and a certain distance between the samples is required to ensure the same condensed solution It will not drip onto another sample. The sample panel is placed at 60 to 70 degrees on the horizontal surface, and one side of the test needs to be exposed to salt spray. The product parts should be installed in the instrument according to the size, shape or erosion state exposed during use. This The location must be agreed. Special care should be taken to ensure that as little salt solution as possible will accumulate in the holes.
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