Salt spray test for stainless steel plate coil metal

Stainless steel tips: salt spray test for an hour is equivalent to how much time in the natural environment .

A lot of people have asked how long is one hour of stainless steel testing equivalent to field use? This is a relatively complex problem, don't worry, let's first understand some of the principles of salt spray test and common problems, the end of the article announced the answer.

Salt spray corrosion of stainless steel metal materials, mainly conductive salt solution into the metal internal electrochemical reaction, forming a "low potential metal - electrolyte solution a high potential impurity" microbattery system, electron transfer occurs, as the anode metal dissolved, forming a new compound that is corrosive.

Chloride ion plays a major role in the process of salt spray corrosion damage, which has a strong penetrating power and easily penetrates the metal oxide layer into the metal interior and destroys the passivity of the metal. At the same time, chloride ions have a small hydration energy, which is easy to be adsorbed on the metal surface, replacing the oxygen in the oxide layer that protects the stainless steel material, so that the metal is destroyed.

There are four kinds of salt spray test: neutral salt spray test (NSS); Acetic acid salt spray test (AASS); Copper accelerated acetic acid salt spray test (CASS); Alternating salt spray test.

By weighing the weight of the stainless steel sample before and after the corrosion test, the weight of the corrosion loss is calculated to evaluate the corrosion resistance of the sample, which is especially suitable for the corrosion resistance of a certain metal sheet strip coil.

How long is one hour of salt spray testing equivalent to the natural environment?

The specific time is converted to: neutral salt spray test 24h natural environment 1 year

Acetate spray test 24h natural environment for 3 years

Copper salt accelerated acetate spray test 24h 8 years natural environment.