Comparison of Materials for Salt Spray Test Chamber Body
Salt spray test is an environmental test that mainly uses artificial simulated salt spray environmental conditions created by salt spray testing equipment to assess the corrosion resistance of products or metal materials. It is divided into two categories, one is natural environmental exposure testing, and the other is artificial accelerated simulated salt spray environmental testing. The artificial simulation of salt spray environment test is a testing equipment with a certain volume space - salt spray test chamber, which uses manual methods to create a salt spray environment in 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.

1、 Comparison of materials used
1. The new salt spray corrosion test chamber adopts a plastic shell made of imported rigid polyvinyl chloride (PVC) plastic sheet, which is molded at high temperature and then welded at high temperature. Its advantages are high temperature resistance, corrosion resistance, and no pollution to the experimental samples; The fiberglass shell is made of a mixture of unsaturated resin, curing agent, talcum powder, pigment, etc., and is formed by compression molding and assembly. It has poor high-temperature corrosion resistance and is prone to water leakage
2. The maximum temperature resistance of the fiberglass shell is 50 ℃. If subjected to high temperature tests for a long time, the box is prone to aging. Once there is water leakage, it is basically impossible to repair, thereby reducing its service life. The plastic shell is made of imported heat-resistant materials, and the test temperature can reach 80-90 ℃. The plastic joints are welded at high temperatures to prevent leakage.
3. Salt spray is very easy to cause corrosion to metal, so the material of salt water spray should be high-temperature corrosion resistant material. The corrosion resistance of PVC is much higher than that of fiberglass, but the disadvantage is that the cost has increased.

2、 Design configuration comparison
1. Fiberglass adopts a bottom heating wire insulation dry heating method to supply temperature to the box, which is more primitive and easily causes aging of the box and reduces its service life. The plastic box is heated by a bottom sink using titanium alloy heating material. This method heats up quickly and the temperature is evenly distributed in every corner of the box, making it easier to control.
2. The plastic salt spray test chamber has added a salt water preheating device, which can keep the temperature of the salt water consistent with the temperature of the box, reducing the temperature fluctuation inside the chamber during the test and controlling it within ± 0.1 ℃.
4. Salt water filtering device is newly added to the plastic salt spray test chamber, but there is no salt water filtering device in the glass fiber reinforced plastic salt spray test chamber. During the test, the nozzle will not be blocked to ensure normal spray until the end of the test.
5. The design of the saturator device in the plastic salt spray test chamber is more scientific, using the current titanium metal heater, exhaust water filtration device, and saturator low water level alarm protection, as well as low water level alarm and automatic water inlet devices.