Stainless steel hemisphere has good stability in nitric acid!
The characteristics of metallogenic media in stainless steel hemisphere are related. Especially related to the oxidation ability of the medium. In nitric acid and other oxidation Media, NO3- Oxidation, stainless steel ball surface oxide film is easy to form a bucket for a short time. In oxidation media, such as dilute sulfuric acid, hydrochloric acid and organic compounds. Low oxygen level, the time required for passivation is prolonged.
when the oxygen content in the medium is low to a certain extent, the corrosion rate of stainless steel balls in dilute sulfuric acid and chromium stainless steel is even faster than that of carbon steel balls. Therefore, stainless steel corrosion-resistant steel grade must be correctly selected according to the characteristics of the working medium. Water vapor in weak corrosive media such as atmosphere and water, as long as solid solution w (Cr) Chromium content of 10% to 12% will ensure no rust.
In nitric acid and other oxidizing acids, due to sufficient oxygen corrosion-resistant stainless steel passivation state in a short period of time, but in acidic detergent containing hydrogen ion cathodic depolarization, therefore, with the increase of hydrogen ion concentration, the content will also increase the required chromium passivation. Only with this method can the chromium content in the oxide film, and the oxide film containing high chromium only has good stability in nitric acid. Therefore, w (Cr)>10%-10% will ensure no rust.
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