The natural original passive film of the stainless steel is the main element to prevent from rusting. However, the outside pollution such as dust, oil, or iron ions during process may disturb the formation of passive film, and cause rustiness. The passivation treatment is to remove the containment on original stainless surface, and improve its oxide layer with chemical processes. The even density can raise its corrosion resistance. For example, stainless steel 17-4PH 630, its salt mist corrosion resistance test can only pass for 12hrs without passivation treatment, but it can pass for 24hrs with passivation treatment. The sewage generated by the process can be proper treated in circulating water system to prevent from pollution.more
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The natural original passive film of the stainless steel is the main element to prevent from rusting. However, the outside pollution such as dust, oil, or iron ions during process may disturb the formation of passive film, and cause rustiness. The passivation treatment is to remove the containment on original stainless surface, and improve its oxide layer with chemical processes. The even density can raise its corrosion resistance. For example, stainless steel 17-4PH 630, its salt mist corrosion resistance test can only pass for 12hrs without passivation treatment, but it can pass for 24hrs with passivation treatment. The sewage generated by the process can be proper treated in circulating water system to prevent from pollution.
