Our daily life to see stainless steel rust occasional situation, I am here to solemnly tell you: stainless steel is rusty. Because, in the actual use
In the actual use of the process, many factors will aggravate the stainless steel surface passivation film suffered damage, so that the passive state of stainless steel into a live state, resulting in the corrosion resistance of stainless steel down
Decrease, and then the phenomenon of rust. The following factors lead to the stainless steel passivation film caused by the occurrence of stainless steel rusting.
Firstly , chloride ion
Chloride ions are extremely harmful to stainless steel. In the passivation process should be strictly controlled in the passivation solution of chloride ion content, the use of passivation with chemical materials on chloride ions have limited requirements.
There are limited requirements.
Preparation of passivation solution water and cleaning water also have strict water quality requirements for chloride ions, to ensure that the passivation finished product is not stained with chloride ions, so as to avoid future problems!
Secondly,Surface Cleanliness
For stainless steel alloys, the lower the surface roughness, the smoother the surface, the more difficult for foreign objects to adhere to, the lower the chance of local corrosion. Therefore, stainless steel should try to
Finished surface can be used. In addition, the surface cleanliness of stainless steel is also very important, the final cleaning of the surface after passivation should be carried out carefully, because the residual acid promotes the cathodic reaction, so that the film layer rupture.
Polar reaction, so that the film layer rupture, so that the activation of stainless steel, corrosion resistance dramatically reduced!
Thirdly,Use of environmental media
Stainless steel passivation film belongs to the thermodynamically inhibited substable structure of the mouth of its protective efficiency and environmental media. In use should be regularly cleaned to remove harmful
Substances adhering to the surface for a long time. Especially in the environment of chlorine ions, to avoid long-term chlorine ions adhering to the surface and concentrated in water, such as stainless steel used for food
On the industry utensils, each time after contact with food, should be washed, so as to avoid the role of chloride ions, damage to the passivation film.
Such as containers and equipment used for dairy products, dairy products contain chloride ions on the bell membrane has a destructive effect, such as long-term filling of dairy products, will lead to corrosion of the capacity and equipment
Perforation, so regular cleaning, so that the passivation film recovery
Fourthly, the intrinsic factors of stainless steel
Stainless steel martensite content and chromium-nickel content of stainless steel passivation performance has a great impact. Low nickel content, passivation performance is low. Martensitic stainless steel
The belloyant film performance is not as good as the belloyant performance of austenitic stainless steel. Therefore, in the daily use of stainless steel, pay attention to the use of stainless steel environment, according to the environment to select the appropriate stainless steel varieties.
Select the appropriate stainless steel varieties, which is very important!
#Stainlesssteelcorrosion #Stainlesssteelplate #Stainlesssteelprocessing
