What causes stainless steel solenoid valves to rust?Release time: 2018-12-24 Click times: 52 times
Stainless steel solenoid valve can not be used normally if it is used for a long time. However, the big reason that it is unusable is rust. Many people think that the stainless steel solenoid valve will not rust. In fact, the surface of the stainless steel solenoid valve is a very thin, strong and dense stable chromium-rich oxide film (protective film) to prevent the oxygen atoms from infiltrating and continuing to oxidize. And get the ability to resist rust. Once the film is destroyed for some reason, oxygen atoms in the air or liquid will continue to infiltrate or iron atoms in the metal will continue to separate out, forming loose iron oxide, and the metal surface will be continuously rusted. As a result, stainless steel is rusted. High pressure solenoid valve
So what caused the film on the stainless steel surface of the stainless steel solenoid valve?
1. The surface of the stainless steel solenoid valve has deposits containing dust or other metal particles containing other metal elements. In humid air, the condensed water between the attachment and the stainless steel connects the two into a micro battery, which triggers The electrochemical reaction, the protective film is damaged, is called electrochemical corrosion.
2. The surface of the stainless steel solenoid valve is adhered to the organic matter juice (such as melons, noodle soup, sputum, etc.). In the presence of water and oxygen, it forms organic acids. For a long time, the organic acids corrode the metal surface.
3. The surface of the stainless steel solenoid valve contains acids, alkalis, and salts (such as splashes of alkali water and lime water for wall decoration), causing local corrosion.
4. In contaminated air (such as an atmosphere containing a large amount of sulfide, carbon oxide, and nitrogen oxide), when it meets condensed water, it forms sulfuric acid, nitric acid, and acetic acid liquid points, causing chemical corrosion.
The above conditions can cause damage to the stainless steel surface protective film and cause rust. To avoid stainless steel rust, please note the following:
1. The surface of the stainless steel solenoid valve must be cleaned and scrubbed frequently to remove attachments and eliminate external factors that cause rust.
2. Seaside area should use 316 stainless steel, which can resist seawater corrosion.
Next: Understanding of the two control methods of stainless steel solenoid valve