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Guangdong area of the salt spray test, providing local service providers to detect amp
Salt spray corrosion is a common and destructive atmospheric corrosion. The corrosion of the metal surface by salt spray is caused by the electrochemical reaction between the oxide layer and the protective layer on the surface of the metal containing chloride ions. At the same time, chloride ion containing certain hydration energy, easy to be absorbed instead of oxygen in the chloride layer on the metal surface of the pores and fractures and to exclude, insoluble oxides become soluble chlorides, which become the active surface state of surface passivation. Adverse reactions to the product. Salt spray test includes neutral salt spray test, salt spray test, acetate copper accelerated acetic acid salt spray test, salt spray test and artificial alternating.
Salt spray test is a kind of environmental test, which is mainly used to test the corrosion resistance of products or metal materials by artificial simulation of salt spray environment created by salt spray test equipment. It is divided into two categories, one is the natural environmental exposure test, the other is the artificial accelerated simulation of salt spray environment test. Artificial simulation of salt spray test is the use of a box of salt fog test equipment has a certain volume of space, artificial methods used in the volume of space, resulting in the salt spray environment to carry out the assessment of product quality of salt spray corrosion resistance. Compared with the natural environment, the salt concentration of chloride salt fog environment, can be several times the general natural environment of salt fog content or a few times, the corrosion speed is greatly improved by salt spray test on the product, the results of the time is greatly shortened. In the case of natural exposure to a product sample test, the corrosion may be 1 years, and in the artificial simulation of salt spray test environment, as long as 24 hours, you can get a similar result.
classification
Artificial simulation of salt spray test and neutral salt spray test, salt spray test, copper accelerated acetic acid salt spray test, cyclic salt fog test.
Neutral salt spray test
Is a kind of accelerated corrosion test method, which is widely used at present. Under normal circumstances, it uses 5% sodium chloride solution, the solution pH value is adjusted in the neutral range (7.2 ~ 6.5) as a spray solution. Test temperature is 35 degrees Celsius, the salt mist of the settlement rate of 1 ~ 3ml/80cm2.h, the settlement is generally between 1 ~ 2ml/80cm2.h.
Salt fog test
Is based on the neutral salt spray test. It is in the 5% Sodium Chloride Solution to add some ice acetic acid, so that the pH value of the solution is reduced to about 3, the solution becomes acidic, after the formation of the salt mist from the neutral salt fog into acid. Its corrosion rate is about 3 times faster than the NSS test.
Copper accelerated acetic acid salt spray test
Is a kind of rapid salt fog corrosion test abroad newly developed test, the temperature is 50 DEG C, adding a small amount of copper salt and copper salt solution, strongly induced corrosion. Its corrosion rate is about 8 times as much as that of the NSS test.
Alternating salt spray test
Is a comprehensive salt spray test, it is actually neutral salt spray test and constant damp heat test. It is mainly used for the cavity type of the whole product, through the infiltration of the tidal environment, so that the salt spray corrosion not only in the product surface, but also inside the product. It is the product of the two kinds of environmental conditions in salt fog and heat under the alternative conversion, after testing the electrical performance and mechanical properties of the whole machine has no change.
technical analysis
Abstract: This paper analyzes the influence of salt fog test technology on the test results, and from the salt fog corrosion mechanism, influence of salt spray corrosion factors including temperature and humidity test, salt solution concentration, sample angle, salt solution pH, salt spray and spray deposition and test results as well as expression of salt fog test the validity of the results are discussed.
Corrosion damage
Salt fog corrosion can destroy the metal protective layer, make it lose decoration, reduce the mechanical strength; some electronic components and electrical lines, due to corrosion caused by power line outages, especially in vibration environments; when salt fog landed on the insulator surface, the surface resistance decreased; insulator salt absorption after the solution, its volume resistance will be reduced by four orders of magnitude; mechanical parts or moving parts of the activity area due to corrosion products, and to increase the friction caused by moving parts is stuck.
corrosion mechanism
The corrosion of metal materials, salt spray, electrochemical reaction mainly occurred inside the conductive salt solution into the metal, the formation of "low potential metal electrolyte solution - high potential impurities" micro cell system, electron transfer occurs, as the anode of the metal dissolved, the formation of new compounds as corrosion. The protective layer of the metal and the organic material are also same. When the salt solution of the electrolyte is infiltrated into the interior, the metal is formed by the metal as the electrode and the metal protective layer or the organic material as the other electrode.
Chloride ion is the main function in the process of salt spray corrosion failure. itWith strong penetrating power, it is easy to penetrate the metal oxide layer into the metal, and destroy the metal. At the same time, chloride ions have a very small hydration energy, easy to be adsorbed on the surface of the metal, to replace the oxygen in the oxide layer of the protection of the metal, so that the metal is destroyed.
In addition to chloride ion, the salt spray corrosion mechanism is also affected by dissolved in salt solution (in essence, the salt liquid film on the surface of the sample). Oxygen can cause the depolarization process of metal surface, accelerate the anodic metal dissolution, due to continuous spray salt fog test in the process of continuous settlement on the specimen surface salt film, make the oxygen content was kept near saturation state. The formation of corrosion products, so that the volume expansion of the salt solution into the metal defects, thus increasing the internal stress of the metal, causing stress corrosion, leading to the protective layer.
standard
According to GB, ASTM, amp detection of ISO, JIS and other standards for salt fog test. Salt spray test standard is the salt spray test conditions, such as temperature, humidity, the concentration and pH value of Sodium Chloride Solution and so on to make specific provisions, in addition to the salt spray test chamber performance technical requirements. The same product using the salt spray test standards to be based on the characteristics of salt spray test and metal corrosion rate and the sensitivity of the salt spray. Here are a few salt fog test standards, such as GB/T2423.17 - 1993 "basic environmental testing procedures for electric and electronic products - Test Ka: salt fog test method", GB/T2423.18 2000 "environmental testing for electric and electronic products part second: Test Kb: salt spray, alternating (Sodium Chloride Solution)", GB5938 86 "light industrial products, metal plating and chemical the processing layer corrosion test method", GB/T1771 91 "neutral salt spray resistance of paints and varnishes - Determination of"