Plastic plating-electroplating quality standard-salt spray test types and determination of test results

Plastic plating-electroplating quality standard-salt spray test types and determination of test results.
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1 artificial simulated salt spray test includes.
The main results are as follows: 1) the neutral salt spray test (NSS test) is the earliest and most widely used accelerated corrosion test method. It uses 5% sodium chloride salt solution, and the PH value of the solution is adjusted in the neutral range (6-7) as the solution for spray. The test temperature is 35 ℃, and the sedimentation rate of salt spray is required to be between 1~2ml/ 80 cm ·h.
2) the acetate salt spray test (ASS test) is developed on the basis of the neutral salt spray test. It is to add some glacial acetic acid to the 5% sodium chloride solution, so that the PH value of the solution is reduced to about 3, the solution becomes acidic, and the final salt spray becomes acidic from neutral salt spray. Its corrosion rate is about 3 times faster than that of NSS test.
3) Copper salt accelerated acetate salt spray test (CASS test) is a rapid salt spray corrosion test newly developed abroad. The test temperature is 50 ℃. A small amount of copper salt-copper chloride is added to the salt solution to strongly induce corrosion. Its corrosion rate is about 8 times that of NSS test.
two.. Salt spray test standard and determination of test results.
a. A standard is a unified stipulation of repetitive things and summaries. The salt spray test standard is a clear and specific stipulation of the salt spray test conditions, such as temperature, humidity, sodium chloride solution concentration and PH value, etc. in addition, it also puts forward the technical requirements for the performance of the salt spray test box. The salt spray test standard for the same product should be selected according to the characteristics of the salt spray test, the corrosion rate of the metal and the sensitivity to the salt spray.
b. The purpose of salt spray test is to assess the salt spray corrosion resistance quality of products or metal materials, and the judgment of salt spray test results is the judgment of product quality, and whether its result is correct and reasonable is the key to correctly measure the salt fog corrosion resistance quality of products or metals.
c. The judgment methods of salt spray test results are: rating determination method, weighing determination method, corrosion occurrence determination method, corrosion data statistical analysis method.
The main results are as follows: 1) the rating method divides the percentage of the ratio of corrosion area to total area into several grades according to a certain method, and takes a certain level as the basis for qualified judgment, which is suitable for the evaluation of plate samples.
2) the weighing determination method is to evaluate the corrosion resistance quality of the sample by weighing the weight of the sample before and after the corrosion test and calculating the weight of corrosion loss. it is especially suitable for assessing the corrosion resistance quality of a certain metal.
3) the method of determining the occurrence of corrosion is a qualitative method, which is based on the corrosion phenomenon of the product after the salt spray corrosion test. this method is mostly used in general product standards. The statistical analysis method of corrosion data provides a method to design corrosion test, analyze corrosion data and determine the confidence of corrosion data. it is mainly used to analyze and count corrosion, rather than to determine the quality of a specific product.