We see the occasional situation of stainless steel in daily life. Here we solemnly tell you: stainless steel will rust. Because in the actual use process, many factors will exacerbate stainless steel surface passivation membranes to be damaged, turning the blunt state of stainless steel into a living state, causing the corrosion resistance of stainless steel, and rust. The following factors have caused the stainless steel passivation film to cause stainless steel rust:

1. chloride ion

Chloride ions are extremely harmful to stainless steel. During the passivation process, the chlorine ion content should be strictly controlled in the passivation liquid, and chemical materials used for the use of passivation should be limited to the amount of chloride ions.

The preparation of the passivation solution and the use of water for water also have strict water quality requirements for chloride to ensure that the passivation of the finished product does not stick to the chlorine ions to avoid posterior troubles.

2. Surface cleanliness

For stainless steel alloys, the lower the surface roughness, the smoother the surface, the more difficult the foreign body is, the lower the chance of local corrosion. Therefore, stainless steel should be used as much as possible. In addition, the surface cleanliness of stainless steel is also very important. The ultimate cleaning of the surface after passivation should be carried out carefully, because residual acid liquid promotes the cathode reactions, causing the membrane layer, thereby activating the stainless steel, and the erosion resistance is reduced.

3. Use environmental medium

The stainless steel passivation film belongs to thermodynamic inhibitory sub -stable -state structure. The protection efficiency is related to the environmental medium. It should be cleaned regularly during use to remove the long -term attachment of harmful substances on the surface. Especially in an environment with chloride ions, avoid long -term milk attachment surface and concentrated mouth in the water such as stainless steel for food utensils. After each contact with food, wash Film.

If the container and equipment for dairy products, the dairy products contain chloride ions to destroy the passivation film. For example, long -term dairy products will cause capacity and equipment to corrode the perforation. Therefore, it is necessary to regularly clean and restore the passivation film.

4. Internal factor of stainless steel

The paradox content and chromium nickel content in stainless steel have greatly affected the passivation performance of stainless steel. Nickel content is low, and the passivation performance is low. The passivation film performance of matelin stainless steel is not as good as the passivation performance of Austeenia stainless steel. Therefore, in the daily use of stainless steel, pay attention to the use of stainless steel to use the environment, and choose the appropriate stainless steel variety according to the environment. This is very important!