What is salt spray test? Salt spray test standard and determination of test results The salt spray test is an environmental test that mainly uses the simulated salt spray environmental conditions created by salt spray test equipment to assess the corrosion resistance of a product or metal material. It is divided into two major categories, one for natural environmental exposure tests and the other for accelerated artificial salt spray environmental tests. Artificially simulated salt spray environmental test is to use a test equipment with a certain volume of space - salt spray test chamber, in its volumetric space with artificial methods, resulting in salt spray environment to assess the product's resistance to salt spray corrosion quality and quality . Compared with the natural environment, the salt concentration of the chloride in the salt spray environment can be several times or several times of that of the normal natural environment, which greatly increases the corrosion rate. The salt spray test is performed on the product and results are obtained. The time has also been greatly shortened. If a product sample is tested under natural exposure conditions, the corrosion may take one year. However, if the test is performed under simulated artificial salt spray conditions, similar results can be obtained as long as 24 hours. Artificially simulated salt spray tests include neutral salt spray test, acetate spray test, copper salt accelerated acetate spray test, and alternating salt spray test. (1) Neutral salt spray test (NSS test) is one of the earliest currently applied fields of accelerated corrosion test. It uses a 5% saline solution and the pH of the solution is adjusted to a neutral range (6 to 7) as a spray solution. The test temperature is taken at 35°C, and the deposition rate of salt spray is required to be between 1 and 2ml/80cm2.h. (2) Acetate spray test (ASS test) was developed based on the neutral salt spray test. It is to add some glacial acetic acid in the 5% saline solution, so that the PH value of the solution is reduced to about 3, the solution becomes acidic, and the final salt fog is also changed from neutral salt fog to acidic. Its corrosion rate is about three times faster than the NSS test. (3) Accelerated Acetate Salt Spray Test (CASS test) is a rapid salt spray corrosion test newly developed abroad. The test temperature is 50°C. A small amount of copper salt, cupric chloride, is added to the salt solution to strongly induce corrosion. . Its corrosion rate is about 8 times that of the NSS test. (4) The alternating salt spray test is an integrated salt spray test. It is actually a neutral salt spray test plus a constant damp heat test. It is mainly used for cavity type machine products. Through the infiltration of the tide environment, the salt spray corrosion will not only be produced on the surface of the product, but also produced inside the product. It is to switch the product alternately under the conditions of salt spray and damp heat, and finally to assess whether there is any change in the electrical and mechanical properties of the complete product. Salt spray test standard and determination of test results Standards are uniform rules for repetitive things and outlines. The salt spray test standard is a specific and specific requirement for the salt spray test conditions such as temperature, humidity, salt solution concentration, and pH value. In addition, the salt spray test box performance is also put forward technical requirements. The salt spray test standard for the same product should be selected based on the characteristics of the salt spray test and the metal corrosion rate and sensitivity to salt spray. The following describes several salt spray test standards, such as GB/T2423.17-1993 "Electrical and electronic products basic environmental testing procedures test Ka: salt spray test method", GB/T2423.18-2000 "electrical and electronic products environmental test part 2 : Test test Kb: salt spray, alternating (saline solution), GB 5938-86 "Corrosion resistance test method for metal plating and chemical treatment of light industrial products", GB/T 1771-91 "Neutralizing resistance to paint and varnish Determination of fog performance." The purpose of the salt spray test is to evaluate the salt spray corrosion resistance of the product or metal material. The salt spray test result is the judgement of the product quality. The judgment result is correct and reasonable. It is a correct measure of the product or metal salt spray resistance. The key to corrosion quality. Salt spray test results are judged by methods such as: rating determination method, weighing determination method, corrosive appearance determination method, and corrosion data statistical analysis method. The rating judgment method divides the percentage of the ratio of the erosion area to the total area into several levels according to a certain method. A certain level is used as a criterion for the determination of conformity. It is suitable for flat plate samples for evaluation. The weighing determination method passes through before and after the corrosion test. The weight of the sample is weighed, and the weight lost from the corrosion is calculated to evaluate the quality of the corrosion resistance of the sample. It is particularly suitable for assessing the corrosion resistance of a certain metal; the corrosion occurrence determination method is a qualitative determination. The method, which is based on the salt spray corrosion test, determines whether the product is corroded to determine the sample. Most of the general product standards use this method. The corrosion data statistical analysis method provides confidence in the design of corrosion tests, analysis of corrosion data, and determination of corrosion data. The method of degree, which is mainly used to analyze and count the corrosion situation, instead of being specifically used to determine the quality of a specific product. Drilling Rubber Hose,Mud Drilling Hose,Rotary Hose,Rotary Drilling Hose Hebei Huayu Special Rubber Co.,Ltd , https://www.api7khose.com