Views: 31 Author: Site Editor Publish Time: 2022-04-09 Origin: Site
After using it for a long time, we will find out why the bathroom products made of pure copper and stainless steel have brown and green rust on the surface. such as soap dish、towal bar、tissue holder ect.Have you ever thought about the quality of the products you bought? A wrong view is that, in our concept, pure copper and stainless steel do not rust.
Pure copper and stainless steel will also rust under certain conditions.
Pure copper and stainless steel can resist atmospheric oxidation - stainless erode in media containing acids, alkalis, and salts - corrosion resistance. However, the size of its anti-corrosion ability varies with the chemical composition of its steel itself, the state of mutual addition, the conditions of use, and the type of environmental media. For example, 304 steel pipe has excellent anti-corrosion ability in a dry and clean atmosphere, but it will rust quickly in the sea fog containing a lot of salt in coastal areas, while 316 steel pipe performs well. Therefore, it is not any stainless steel that can resist corrosion and rust in any environment.
Stainless steel relies on a fragile, firm, fine, and stable chromium-rich oxide film (protective film) formed on its surface to prevent the continuous infiltration and oxidation of oxygen atoms from obtaining the ability to resist rust. Once the film is damaged, oxygen atoms in the air or liquid will continue to infiltrate, and iron atoms in the metal will separate to form loose iron oxide. The metal surface will be continuously corroded. There are many forms of damage to this surface film, the most common in daily life are the following:
1. On the surface of pure copper and stainless steel, there are deposits of dust or heterogeneous metal particles containing other metal elements. In the humid air, the condensed water between the attachment and the stainless steel connects the two into a micro-battery, causing an Electrochemical reaction. The protective film is damaged, called electrochemical corrosion.
2. Organic juices (such as vegetables, noodle soup, sputum, etc.) adhere to the surface of pure copper and stainless steel. In the presence of water and oxygen, organic acids are formed, and organic acids will corrode the metal surface for a long time.
3. The surface of pure copper and stainless steel contains acids, alkalis, and salts (such as alkali water and lime water splashing on the decoration walls), causing local corrosion.
4. In the polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, nitrogen oxide), when it encounters condensed water, it will form sulfuric acid, nitric acid, and acetic acid liquid points, causing chemical corrosion.
The above conditions can cause damage to the protective film on the surface of pure copper and stainless steel and cause rust. Therefore, to ensure that the metal surface is permanently bright and not rusted, we recommend:
1. The surface of decorative stainless steel must be cleaned and scrubbed frequently to remove attachments and eliminate external factors that cause modification.
2. 316 stainless steel should be used in seaside areas to resist seawater corrosion better.
3. The chemical composition of some pure copper and stainless steel pipes on the market does not meet the national standard or meet the 304 material requirements. Therefore, it will also cause rust, and users choose to buy from reputable merchants with quality assurance.
Why is stainless steel also magnetic?
People use magnets to adsorb stainless steel materials to verify their pros, cons, and authenticity. The wrong way to distinguish is that Non-magnetic ones are good and magnetic ones are fakes.
1. After showering, dry the faucet and stem with a soft towel because the residual shower gel will erode the plating layer.
2. After the plating layer begins to rust, wipe with toothpaste around the rust spot.
3. In the bathroom, try to use as little acid cleaner as possible and use less soap and other objects to scrub the faucet.
The treatment secret of pure copper and stainless steel rust
1. Vinegar to remove embroidery: The green patina on the copper utensils can be wiped off with a cloth soaked in vinegar and then with an appropriate amount of salt.
2. Sea salt removal method: If the rust on the copper utensils is severe, run away the concentrated sea salt solution with hot water and wipe it to eliminate the rust.
3. Kerosene, tooth powder removal method: first wipe with a cloth dipped in kerosene, then wipe with tooth powder; remove the patina.
4. Lemon juice removal method: If there is rust on the copper utensils, it can be removed by wiping with lemon juice and salt. If you want to make it brighter, you can wipe it with tin foil from a pack of cigarettes; the effect is excellent.
