The water pump has two main characteristics: first, it does not rust, and second, it can withstand high temperatures. But when the surface of the stainless steel water pump rusts, people may suspect that stainless steel does not rust. How did it rust? Is there a quality problem with the purchase. In fact, this viewpoint is incorrect. As the name suggests, the main material of stainless steel water pumps is stainless steel, which has non rusting properties and corrosion resistance. But its anti-corrosion ability depends on the usage conditions and environment. That is to say, not any type of stainless steel can resist corrosion and rust in any environment.
Here, the editor has shared some knowledge about stainless steel water pumps with everyone. Stainless steel has the ability to prevent the continuous penetration of oxygen atoms through a chromium rich oxide film on its surface, which further oxidizes and prevents rust corrosion. However, if this film is continuously damaged, oxygen atoms in air or liquid continue to penetrate, or iron atoms in the metal are continuously analyzed to form loose iron oxide, the metal surface will also be continuously corroded.
At the same time, due to the special usage environment of stainless steel water pumps, the requirements for materials are quite careful when purchasing. We want to know the authenticity of the materials and whether they will be sold as good to avoid being deceived. Here, the editor summarizes several commonly used methods for reference only.
1. The color identification is pickling stainless steel, with a silver white surface color that is very clean: chrome nickel stainless steel silver white is jade color. Chromium stainless steel has a slightly grayish white color and weak luster; The color of chromium nitrogen stainless steel is similar to that of chromium nickel stainless steel. The surface color of unwashed stainless steel: Chromium nickel steel is brown, chromium steel is brown, and chromium nitrogen is black (these three colors refer to colors with heavier oxidation). Cold rolled chromium nickel stainless steel without degradation has a silver white surface reflection.
2. Stainless steel water pumps use magnets to distinguish between two types of stainless steel. Because chromium stainless steel can be attracted by magnets in any state. Chromium nickel stainless steel generally has no magnetism in the annealed state, but it also has magnetism after cold working. But high manganese steel has no magnetism. The magnetic properties of chromium, nickel, nitrogen, and stainless steel are more complex. Some have no magnetism, some have magnetism, some have no magnetism in the longitudinal section, and some have magnetism in the transverse section. Therefore, magnets can basically distinguish between chromium stainless steel and chromium nickel stainless steel, but cannot accurately distinguish certain special properties of steel grades, nor can they distinguish specific steel grades.
3. Stainless steel water pumps use copper sulfate to identify and remove the oxide layer of steel. Add a drop of water and wipe it with copper sulfate without changing color. Generally, it is stainless steel. Turning purple, non-magnetic is high manganese steel, and magnetic is usually ordinary steel or low-alloy steel or above. Both are sensory identification, and the identification results may not be accurate and need to be supplemented. Moreover, it can only identify the steel grade of stainless steel and cannot identify specific material elements.
