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Does 304 stainless steel really not rust?

Published on: April 17, 2021 Views:

In general, stainless steel will not rust. However, if the stainless steel is used or maintained improperly, or the environment in which the stainless steel is located is too bad, the stainless steel may rust. Application of stainless steel: it is required to be able to withstand the corrosion of various acids such as oxalic acid, sulfuric acid iron sulfate,, -, sulfuric acid copper sulfate, phosphoric acid, formic acid and acetic acid. It is widely used in chemical industry, food,, papermaking, petroleum, atomic energy and other industries, as well as various parts of buildings, kitchenware, tableware, vehicles and household appliances. When we see the yellow or orange rust spots on the steel surface, we can quickly confirm that it is a sign of rust. Why does 304 stainless steel plate rust? First of all, let's understand the structure of stainless steel: stainless steel is a crystal solid composed of atoms similar to patchwork toys. In addition to iron, it also contains its metal components, such as chromium, nickel, titanium, etc. Chromium and nickel have anti rust function. It forms a protective film - passive film to prevent stainless steel from rusting. In general, stainless steel will not rust as long as the film is not damaged, broken or contaminated by impurities. However, if the passive film is damaged due to improper use or maintenance, the stainless steel will rust. Ordering requirements and post fabrication inspection can prevent and find the existence of free iron. ASTM standard A380 [3] specifies the rust test method for inspecting iron or steel particles on the surface of stainless steel. This test method should be used when absolutely no iron is required. Jin zhe metal