What kind of medium does the metal electrode of the mass flowmeter adapt to the environment

The main reason for the corrosion resistance of stainless steel electrodes of mass flowmeters is that the surface is covered with a very thin (about 1nm thick) dense passivation film. This layer of passivation film isolates the corrosive fluid medium and becomes the basic barrier for stainless steel electrode protection. Passivation of stainless steel electrodes has dynamic characteristics, and should not be regarded as a complete stop of corrosion, but a barrier layer for diffusion, which greatly reduces the rate of anode reaction. For stainless steel electrodes, it tends to destroy the passive film in the presence of reducing agents (such as chloride ions), and maintain or repair the passive film in the presence of oxidants (such as air and water). Stainless steel electrodes will form an oxide film when placed in air and water, but the protection of this film is not perfect and the speed is very slow. At a depth of about 1nm, the chromium content is about 20%, which means that the passivation film is a chromium-poor layer. The picture on the right shows the passivation treatment process through mechanical grinding and polishing, pickling, chemical polishing and other processes, so that iron and iron oxides are preferentially dissolved than chromium and chromium oxides, and the chromium-poor layer is removed, resulting in chromium on the surface of stainless steel The enrichment of chromium reaches about 30% at a depth of about 1nm. The polarization potential (SCE) of this chromium-rich passivation film can reach +1.0V, which is close to the polarization potential of precious metals gold and platinum, so the stainless steel can improve the stability of corrosion resistance. Different passivation treatment methods will also affect the composition and structure of the film, thereby affecting the rust resistance. For example, through electrochemical modification, the passivation film can have a multi-layer structure, and CrO3 or Cr2O3 can be formed in the barrier layer, or a glassy oxide film can be formed, so that the stainless steel can exert its maximum corrosion resistance.

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