Factors Affecting The Damage Of Passive Film On The Surface Of 301 Stainless Steel Strip
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In practical application, there are many factors that will destroy the passive film on the surface of 301 stainless steel strip, change the composition of stainless steel from passive state to active state, and deteriorate its corrosion and oxidation resistance. Next, we will share with technicians several common factors affecting the destruction of the passive film on the surface of 301 stainless steel strip!
1. Chloride ion.
Chloride ion will cause great harm to 301 stainless steel belt. In the passivation process, it is necessary to strictly control the content of chloride ion in the passivation solution. The passivation materials used should have limited requirements for chloride ion. During configuration, the water used and cleaning water also need to be controlled to ensure that the water quality meets the requirements, otherwise the surface of the passivated finished product will be adhered with chloride ion.
2. Surface cleanliness.
The cleanliness of the surface of 301 stainless steel strip will also affect the passive film on its surface. Generally speaking, the smoother the surface and the lower the roughness, the more difficult it is for foreign matters to adhere to it and the lower its corrosion performance. Therefore, the surface should be finished during processing.
3. Use environmental media.
The passive film of 301 stainless steel strip itself will be subject to metastable structure, and its protective effect is directly related to the environmental medium. In use, its surface needs to be cleaned frequently, which can well remove the harmful substances attached to the surface. Especially after contacting with acidic articles, it must be cleaned in time to restore the passive film.
In addition, some components in the material of 301 stainless steel strip will also affect the passivation film on its surface. For example, the content of martensite and chromium nickel in the material will affect the passivation film. If the content of nickel is low, the passivation performance is poor, and the passivation performance of martensite is also poor compared with austenite.
