304 stainless steel after chemical passivation (general concentration 20%-generally 20%- 50%nitric acid, passivation for 10-30 minutes) can impact 500 hours of neutral salt fog experiment. So if other factors are ignored, the answer is, yes. However, the corrosion resistance of Austeenia stainless steel is tested in a neutral salt fog test method, and I personally hold an objection. There are two reasons:
First of all, basically all stainless steel can resist corrosion, mainly because chromium oxidation forms a dense passivation layer, isolate the effects of air and other corrosive media on the substrate. The production of the passivation layer takes a certain time. The salt fog experiment could not simulate the realm of the material to produce the passivation layer.
Second, the austenite stainless steel for halogen, such as chlorine and sensitive. It is easy to generate point erosion sources in places with thin local passivation film, forming a self -catalytic gradually aggravated original battery response, forming severe local corrosion. However, in the actual use process, it can be damaged in time and local passivation film. In the atmospheric environment, the passivation film can be repaired by itself. Of course, this also explains why a thicker passivation film is formed with chemical methods, which can tolerate a longer salt fog test.
Of course, if your material has just been polished, polished, and the passivation film is destroyed, the salt and fog experiment will be performed immediately, and it may also be local corrosion in 96 hours.
There is no effective way to detect the passivation film. ISO 16048 recommends testing the changing curve of the electrode potential and current, but it cannot directly react The thickness of the passivation film >. I once considered the half side of the sample with a tape to passivation, and then used the co -focusing microscope to measure the step height after the torn tape was torn off. But just thought, I haven't tried it yet.
AOTSI salt fog test box, also known as salt water spray test machine, salt fog test machine, salt fog test box as manual One of the three defense (three defense (damp heat, salt fog, mold) test equipment is an important test equipment that studies the adaptability and reliability of various environmental adaptability and reliability in the research machinery, defense industry, light industry electronics, instrumentation and other industries. Advantages: the corrosion environment can be controlled, the environment is good; the test time is significantly shortened; a large amount of manpower, financial resources, and material resources have been saved. , Plating, coating, etc. of metal materials and products salt mist corrosion test > .
< style=font-size: 18px;> Meet the test standard and test method: >
B117-2011 Salt Mist Test
2.gjb150.11_1986 salt fog test
3.GB-T10125-2012 artificial atmosphere corrosion test salt salt salt salt salt salt salt saltFog Test
4. GBT2424.17-2008 salt fog test method5.GB-T5170.8-2008_Chat electronic productsEnvironmental test equipment testing method ___
salt fog test equipment > 6.gjb150.11a-2009 military equipment laboratory environment test method salt salt salt salt saltFog Test
You can customize according to customer product size. > >