First, the importance of the salt spray test chamber
Salt spray chamber brands do salt spray test in order to assess product or an important means of resistance to salt spray corrosion materials, the results of scientific rationality is very important. There are many factors affecting the stability and consistency of salt spray test results, it is to improve the effectiveness of the salt spray test results, it is necessary to improve the test technology. Therefore, test personnel need to have not only a solid professional knowledge and expertise outside, but also has a wealth of practical experience and comprehensive understanding of the product.
From a multidisciplinary chemical and environmental engineering, materials, structures and technology and other fields to get to know the salt spray test salt spray chamber, the scientific and rational expression test results, better product selection, structural design, process selection, storage transport products and to provide effective use of information to improve resistance to salt spray corrosion products or materials.
Second, the salt spray chamber actual role
Salt spray chamber using the salt spray test is a major create artificial salt spray conditions to assess the corrosion resistance of a metal material or product environmental testing energy. It is divided into two categories, one of its natural environment exposure test, the other one for artificial accelerated salt spray test environment artificial salt spray test is a test using apparatus having a volume of space - salt spray chamber, in which the volume of the space by artificial means, resulting in salt spray environment of salt spray corrosion resistance of the product quality assessment. compared with the natural environment, the chlorine of the spray environment, the natural environment may be a general Salt content several times or several times, so that greatly improved the corrosion rate of product salt spray test, the results of time is greatly reduced. exposure in the natural environment as long as 24 hours on a product sample testing, corrosion may have to wait until a year, while in artificial salt spray test environmental conditions, , you can get similar results.
Comprising a neutral salt spray test, acetic acid salt spray test, copper accelerated acetic acid salt spray test for salt spray chamber using the salt spray test, the alternating salt spray test.
1. The neutral salt spray test (NSS Test) is the earliest appearance currently the most widely accelerated corrosion testing of applications. It uses a 5% aqueous salt solution was adjusted PH value in the neutral range (6-7) as a spray solution. test temperatures were taken with 35 ℃, Salt required sedimentation rate is between 1 ~ 2ml / 80cm2.h.
2. The acetic acid salt spray test (ASS test) is developed on the basis of the neutral salt spray test. It was added to some of glacial acetic acid in a 5% saline solution, so that PH of the solution was reduced to about 3 solution became acid and the final form of the salt spray neutral salt spray become acidic. its corrosion rate faster than about three times the NSS test.
3. copper accelerated acetic acid salt spray test (CASS test) abroad recently developed a rapid salt spray corrosion test, the test temperature is 50 ℃, small amount of copper salt solution --- copper chloride, strongly induced corrosion. its corrosion rate is about 8 times the NSS test.
4. The alternating salt spray test is a comprehensive salt spray test, which is practically neutral salt spray test plus a constant humidity test. It is primarily used for cavity type products machine, by a tide-environment *** salt spray corrosion not only the surface of the product, but also internal product produced. it is the product alternates between the salt spray and humid environmental conditions, electrical and mechanical properties of the final assessment of whether the change in the whole product.