Fire Pit

Rust treatment method is on the surface of weather-resistant steel, using chemical methods (rust liquid)) to produce rust film, which is a kind of inhibition of the rust flowing out of the early use of steel to make it. Manual treatment is generally 30 days. Generally, if the local damage of the coating treatment is caused, the coating stripping phenomenon is caused, which rusts, and must be painted again in order to maintain the beauty. However, the rusting treatment method is to slowly dissolve the skin film, so that the resulting rust is gradually expanded to all, and a layer of skin film is covered on the steel surface, which does not need to be maintained.
1. Stage: weathering steel begins to grow small rust points, the rust points of ordinary steel plates are relatively loose, and some rust treatment is poor and even rust skin;
2, the second stage of steel plate long rust: weathering steel rust water less, the rust point is small and thick; The rust water of ordinary steel plate is more, and the rust points are larger and thin. Rust column of ordinary steel plate,
Tears are more serious, the bottom of the workpiece has black signs;
3, the third stage of steel plate long rust: weathering steel has a clear and dense rust core layer, and the rust points are tightly bonded to form a protective layer, which can hardly be rusted off by hand; Plain plate removal
The amount of rust is more, and even the whole rust skin is peeled off and rusted through. Weathering steel is biased to reddish-brown, ordinary steel plate is biased to dark color.

1. Corrosion of welding points: the oxidation rate of welding points is the same as that of other materials, which requires welding materials and technology.
2. Water corrosion: weathering steel is not stainless steel, if there is water in the concave position of weathering steel, the corrosion rate will be faster, so do a good job of drainage.
3. Salt-rich air environment: Weathering steel is more sensitive to salt-rich air environment such as Hawaii. In such an environment, the outer protective membrane may not prevent internal entry
One step oxidation.
4. Fading: The rust layer on the surface of weathering steel can make the surface of objects near it become rusty.

During the use of weathering steel in contact with the atmosphere, the surface of the metal matrix forms a dense, amorphous oxide layer with good adhesion, and the color gradually turns from rust red to dark green and eventually to dark purple, and from now on, the corrosion is no longer stable, this protective film effectively blocks the intrusion of corrosion and extends the service life of the component. The corrosion resistance of weathering steel and ordinary carbon steel in different environments is compared, the data show that the average corrosion depth of weathering steel in the seaside environment after 16 years is about 0.1~0.2mm, in the industrial zone and the countryside is about 0.02~0.04mm, this result shows the good weather resistance of corrosion resistant steel. China's Wuhan Iron and Steel Company has also tested its weathering steel, and the results show that even in the seaside city, the average corrosion depth of weathering steel is about 0.02mm/ year. Even taking into account other abnormal factors, it is generally believed that the atmospheric corrosion resistance of weathering steel is 3 to 4 times that of general structural steel, and its corrosion resistance life can reach more than 30 years even under bare packaging conditions.