The passivation film on the surface of 304 stainless steel strap treated with stainless steel passivation solution mainly plays a protective role. However, in actual use, there are many factors that lead to the destruction of the passivation film on the surface of 304 stainless steel strap, so that the surface of the passivated state into an active state, reducing the corrosion and oxidation resistance of 304 stainless steel strap, ultimately leading to rust and corrosion.
1. Chlorine ions. Chloride ions on the 304 stainless steel strap is very harmful, in the passivation process should need to strictly control the chlorine ion content in the passivation solution, even when cleaning, or need to monitor the chlorine ions in the water, to ensure that in the process of passivation of the finished product the chlorine ions content is very low, so as to be able to maintain the corrosion resistance of the 304 stainless steel strap.
2. Surface cleanliness. 304 stainless steel strap has a smooth surface, it is difficult for foreign objects to adhere to it, so the probability of corrosion is extremely low. However, some surfaces are rough, foreign objects can easily attach to it, which will cause surface corrosion of stainless steel strap.
3. The use of environmental media. 304 stainless steel strap surface passivation film from the thermodynamic leavening point of view, is inhibited by the substable structure, the protective effect and the environmental media. In use should require regular cleaning, which helps to remove harmful substances attached to the surface.
4. The intrinsic factors of the stainless steel belt itself. Some stainless steel in some components will also have an impact on its surface passivation film, such as a certain stainless steel strap in the martensitic content as well as chromium and nickel content on the passivation film is relatively large, if the nickel content is relatively low, the passivation performance is much worse. And martensitic stainless steel strap and austenitic stainless steel strap compared to passivation performance is also poor.
Post time: May-11-2024