Corrosion conditions In humid air, the appearance of stainless steel containing dust or other metal particles attached to other metal elements, condensation between the attached material and stainless steel, the two are connected into a miniature battery, causing electrochemical reverberation, maintenance of the membrane Being destroyed is called electrochemical corrosion.
WeChat stainless steel adheres to organic juice in water (such as melon, noodle soup, wolfberry, etc.). Under oxygen conditions, it constitutes an organic acid. In the long run, the organic acid will corrode the metal surface. The appearance of stainless steel will adhere to acids, alkalis and salts (for example, alkaline water and lime water splashed on the decorative wall), resulting in partial corrosion.
In contaminated air (such as an atmosphere containing many sulfides, carbon oxides, and nitrogen oxides), condensed water forms liquid spots of sulfuric acid, nitric acid, and acetic acid, causing chemical corrosion. All the above conditions may constitute corrosion of the stainless steel outer protective film and cause corrosion. The corrosion resistance of the corrosion-resistant stainless steel plate mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, manganese, etc.) and internal layout.
The main role is chromium. Chromium has high chemical stability and can form a passivation film on the surface of steel, thereby isolating the metal from external resistance. The steel plate is not oxidized, and the corrosion resistance of the steel plate is increased. When the passivation film is damaged, the corrosion resistance decreases.
