The concept of the erosion: It is well known that stainless steel has excellent corrosion resistance because there is a layer of visible film in the surface, which makes it passive, and if the oxide film is destroyed, stainless steel will continue to corrode. In many cases ...#CrazyMetal #Stainlessstee
Factors Causeing Stainless Steel
1. Pixabavis is likely to be a chloride ion having a sticker with a depot. Pixabavisants of stainless steel and other cavities are often treated due to local damage to the passivation film due to certain corrosive anions. Circularly protecting high corrosion resistance usually requires oxidizing environments, but it is also the condition of erosion. Generating a diction is a chloride solution of FE3 +, Cu2 +, Hg2 + equal heavy metal ion or H2O2, O2, etc., or an alkaline earth metal ion.2, the rate increases with the temperature increases. For example, in a solution having a concentration of 4?o 10?odium chloride, the weight loss caused by the nose at 90 ° C is maximum; for a more dilute solution, the maximum value appears at a higher temperature.
Summary: The surface oxide film of the stainless steel surface is similar to the environmental formation conditions required to cause the phenomenon, so that the corrosive element in a particular environment is destroyed on the surface oxide film, and the oxide film cannot be repaired, and the erosion has always been Performing, resulting in the formation of phenomenon, and the temperature is one of the main conditions that affect the etch rate.
Method 1 of preventing stainless steel pod erosion is avoided to avoid halogen ions.
2, to ensure uniformity of oxygen or oxidative solution, stirring solution and avoiding solutions in static.
3. Improve the concentration of oxygen or remove oxygen.
4, increasing the pH. Compared to neutral or acidic chlorides, the obvious basic chloride solution is less, or not completely (the action of hydroxide ions).
5. Work at the lowest possible temperature.
6. Add passivation agent in a corrosive medium. Low concentrations of nitrate or chromate are effective in many media (inhibiting ions) on the metal surface, thus preventing etching of chloride ions from adsorption).
7. Use cathode anti-corrosion. There is evidence that stainless steel protected by low carbon steel, aluminum or zinc electrode is not caused in seawater.
Note: 2?o 4?f boss molybdenum has good abduction resistance. Molybdenum or generally corrosive, corrosive media such as sodium chloride solution, seawater, sulfuric acid, sulfuric acid, phosphoric acid and formic acid.
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