Marui Technology (changzhou) Co., Ltd.

Passivating treatment

Passivating treatment

On the stainless steel surface, there is a very thin layer of (2~ 3nm) highly corrosion- resistant and highly stable chromium oxide film generated, with which, even in a highly corrosive environment, the steel is not easy to be corroded and this layer of film is called a Passive Film, which, though it is generated in the atmosphere, if it is immersed in nitric acid aqueous solution, a stable layer of oxide film will be generated. This is what we called passivating treatment.

So-called new P-Max treatment

The new P-Max treatment will first dissolve and clear off metamorphic layers generated in the electrolytic grinding, polishing, grinding and machining performed as a pretreatment and, at the same time, will modify the topmost of its surface into a chromium-rich surface with the chromium and iron content to be or above 1.6:1. Having improved its corrosion resistance by electrolytic grinding, if further soaking it in a special passivating liquid, a subtle and stable oxide film will be generated on it and this film will be doped with highly corrosion-resistant metal compounds.


High resistance to pitting corrosion
Even if the pitting corrosion potential is shown to be 800mv ~ 1000mv and there exist halogen compounds that may damage the passive film of the stainless steel, there is still a higher resistance to pitting corrosion.
High resistance to liquidation
The passive film is doped with highly corrosion-resistant metal compounds, so as to improve its resistance to liquidation.

Construction Example