Salt spray refers to a dispersion system composed of tiny droplets containing salt in the atmosphere, which is one of the three prevention series of artificial environments. Many enterprise products need to simulate the destructive effects of the climate around the ocean on their products. Salt spray testing simulates the occurrence of this phenomenon, so the detection equipment - salt spray testing chamber - should be operated. Corrosion is the damage or deterioration of materials or their properties caused by environmental factors. Most corrosion occurs in the atmospheric environment, which contains corrosive components and factors such as oxygen, humidity, temperature changes, and pollutants. Salt spray corrosion is a common and destructive atmospheric corrosion. The salt spray testing machine is suitable for surface treatment of various materials, including coatings, electroplating, organic and inorganic films, anodizing, rust proof oil, etc. After retesting, the corrosiveness of the products is tested.
salt spray test chamberThe box needs to be able to be heated and maintain pressure balance, and sensors for measurement and control need to be installed to control the testing temperature. The SS and ASS tests in the sealed box are (35 ± 2) ℃, and the CASS test is (50 ± 2) ℃. The test container needs a small volume of 400 liters, and can ensure that the droplets condensed by spray will not drop from the top or side walls and prevent the sample from contacting the spray The test solution cannot be reused after spray The effective space for testing is limited to the part outside the nozzle in the box with a uniform and verifiable spray diffusion range. The nozzle should be made of polypropylene glass or stainless steel. If other materials are used, they must comply with the instructions specified in the standard The nozzle diameter is 1mm, the spray diffusion angle is 30 degrees, the nozzle standard pressure is 0.7-1.4bar, and the distance between the nozzle and the liquid level is 200-500mm, which is proved to be effective Monitor this equipment to ensure that the spray is controlled within the specified limits every hour. The spray nozzle can be monitored by using a flow sensor. If there is more than one nozzle, each nozzle needs a special flow and control sensor The spray should not be directed directly at the sample, and should be directed at the barrier or instrument wall. If the nozzle is at the bottom, spray upward. The spray of Example1 can only be carried out in a high-capacity instrument to ensure that no sample is placed above the nozzle. The number and arrangement method of spray nozzles need to be selected to ensure that the standard meets the standard specifications. Fix the sample with a bracket to keep it in the salt spray area and ensure that it does not come into contact with each other, thereby eliminating the possibility of contact corrosion. There needs to be a certain distance between the samples to ensure that the solution condensed on one sample does not drip onto another sample The sample panel is placed at a horizontal angle of 60 to 70 degrees, with one side of the test exposed to salt spray. Product components should be installed in the instrument according to their size, shape, or exposed corrosion state during use This location requires consent Special attention should be paid to ensuring that as little salt solution as possible accumulates at the pores.
salt spray test chamberError of the instrument itself: Error caused by imperfect design, manufacturing, calibration, as well as factors such as component aging, mechanical component wear, fatigue, etc. during the use of the salt spray testing machine. Meanwhile, various auxiliary equipment or accessories may cause errors to occur. 2. Environmental error: The error caused by the inconsistency between actual environmental conditions and specified conditions, and any test is always conducted in a certain environment. The main environmental influencing factors are temperature, power supply voltage, and electromagnetic interference. 3. Experimental method error: Errors caused by incomplete operating methods. The operation method refers to a set of theoretical applications and practical operations involved in conducting experiments based on inherent principles. Errors caused by loose theoretical basis, unreasonable operation, and the use of approximate formulas or values to calculate test results during the experiment. 4. Personnel error: Errors caused by subjective factors and operational techniques of operators. Personnel errors are mainly caused by poor resolution ability, visual fatigue, slow detector speed, unhealthy habits, and lack of responsibility of the staff. 5. Sample instability error: an error caused by the unstable changes in the sample itself. Experiments require a certain amount of time, and if the sample becomes unstable and changes during the testing time, even the best performing salt spray testing machine cannot obtain accurate test results.
Artificial simulation of salt spray environment test is a test equipment with a certain volume space -salt spray test chamberArtificially creating a salt spray environment within its volume space to assess the quality of the product's salt spray corrosion resistance performance. Compared with the natural environment, the chloride salt concentration in its salt spray environment can be several times or tens of times higher than the salt spray content in general natural environments, greatly increasing the corrosion rate. The time required to obtain the results of salt spray testing on products is also greatly shortened. If a product sample is tested under natural exposure conditions, it may take up to 1 year for it to corrode, while testing under artificial simulated salt spray conditions only takes 24 hours to obtain similar results. However, artificial accelerated simulation experiments are still different from natural environments and cannot be replaced.