Iron products are common metal products in life, iron products appear in every part of our life, but the use of iron products has a great trouble, iron products will appear rust, whenever rust occurs, will affect the use and appearance of iron products. Add non-metallic coating: clean, dry, and then apply a layer of protective materials on the surface of iron and steel products, such as oil, grease, antirust grease, plastic and paint, etc.
There are two kinds of electrochemical protection. One is to connect a piece of metal that is slightly more vivid than it. For example, a ship hull is inlaid with a zinc block, that is, zinc is slightly more vivid than iron, which can rust before iron and cover iron, but it needs regular supplementation. The second is to connect the negative electrode of the power supply, such as the steel river gate is often connected with the negative electrode of the power supply, through the negative electrode. The methods include: metal cover film such as electroplating, organic coating such as paint, transformation layer such as blue or black, adding elements to change the metal structure.
Temporary rust prevention is to prevent the protective layer to complete the mission, to be removed. The methods include: cheating corrosion inhibitor, coating antirust oil, stripping molecular compound plastic, dry air, vacuum, etc. Change the internal structure of the metal: add chromium, nickel and other alloying elements to make stainless steel, but the alloy is not much, expensive, difficult to produce widespread application.
Industrial rust prevention method: coated with asphalt, iron roof, coated with asphalt, can rust prevention. Add metal coating: some metal surface will form a layer of dense oxide film, the metal surface can be coated with this metal formed a cover layer. For example, galvanized iron, tinplate, bicycle reels and some medical equipment are coated with chromium and nickel.
Post time: 09-08-21