Stainless steel decorative tube rust reasons detailed

Stainless steel decorative tubes , in general terms, are steel that is not easily rusted. The stainless steel tube has both rust and corrosion resistance due to the formation of a chromium-rich oxide film (passivation film) on its surface. This rust and corrosion resistance are relative. The test shows that the corrosion resistance of steel in the weak medium such as atmosphere and water and oxidizing medium such as nitric acid increases with the increase of chromium content in steel. When the chromium content reaches a certain percentage, the corrosion resistance of steel is abrupt. From rust to rust, from corrosion resistance to corrosion resistance.


Since the name is stainless steel decorative tube, why is it rusty?


Many people think that stainless steel decorative tubes will not rust, after all, the name is called. But this perception is an obvious lack of understanding of stainless steel tubes. The specific material of the stainless steel decorative tube has a low corrosion rate compared to other steel materials, but it does not absolutely rust.


The stainless steel decorative tube is a very thin and strong and stable chromium-rich oxide film (protective film) formed on the surface thereof to prevent the oxygen atoms from continuing to infiltrate and continue to oxidize, thereby obtaining the ability to resist rust. Once for some reason, the film is continually destroyed, 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.


Stainless steel decorative tube


And what conditions in our lives can cause stainless steel decorative tubes to rust?


The principle of rusting stainless steel pipes is that the surface film is damaged. The common ones are as follows:


1. During the decoration of the kitchen, welding debris, cement, oil stains, etc. remain on the surface of the faucet and the sink. Failure to clean in time may cause rust and mildew;


2, sometimes, the newly renovated house with mineral or acid-alkaline dust falling on the faucet, the surface of the sink encountered moisture will also cause "floating rust";


During use:


1. Steel articles such as kitchen knives, scissors, and bottle openers are placed on the surface of the sink for a long time, causing rust, mildew or discoloration;


2, chemical agents, cleaning agents, paints, sauces, oil stains, etc. remain in the faucet, sink, for a long time, will cause moldy sticky on the surface of the faucet, sink;


3. In many areas of China, the water quality is not good. In addition, too many water pipes are galvanized pipes. The content of iron and other elements in the water is too high. If the water tank is used after the water tank is used, if the water remains, the iron in the water will rust, especially New house decoration, such as long-term residual water in the water pipe, leaving water stains on the water tank is not cleaned in time, it is easy to cause floating rust. In addition, these two basic substances can damage the passive surface of stainless steel and cause corrosion:


First, mechanical abrasives


It refers to things that will scratch the surface of the steel, such as steel scraps, wire brushes and metal fragments.


Second, bleach


There are traces of it everywhere in life, such as water and food, and the most influential ones come from industrial detergents and household cleaners.