Detailed analysis of galvanized angle steel

　　What is Galvanized Angle Steel?

　　Galvanized angle steel is divided into hot-dip galvanized angle steel and cold-dip galvanized angle steel. Hot-dip galvanized angle steel is also called hot-dip galvanized angle steel or hot-dip galvanized angle steel. The cold-dip galvanized coating mainly ensures the full contact between the zinc powder and the steel through the electrochemical principle, and generates a potential difference for anti-corrosion.

　　Classification:

　　According to the process classification, it can be divided into hot-dip galvanized angle steel and cold-dip galvanized angle steel. The most common in the market is hot-dip galvanized angle steel. Cold galvanized angle steel generally needs to be processed by cold galvanizing according to user needs. According to the side length, it can be divided into galvanized equilateral angle steel and beryllium zinc unequal angle steel.

　　Hot-dip galvanizing is divided into blowing galvanizing and rack galvanizing.

　　Process flow hot-dip galvanized angle steel

　　Hot-dip galvanized angle steel is also called hot-dip galvanized angle steel or hot-dip galvanized angle steel. It is to immerse the derusted angle steel in the molten zinc at about 500 ℃, so that the surface of the angle steel is attached with a zinc layer, so as to achieve the purpose of anticorrosion. It is suitable for various strong corrosive environments such as strong acid and alkali fog.

　　Process: hot-dip galvanized angle steel process; angle steel pickling → water washing → immersion in plating solvent → drying and preheating → rack plating → freezing → passivation → cleaning → grinding → hot-dip galvanizing to complete.

　　The thickness of the galvanized layer of the hot-dip galvanized angle steel is uniform, up to 30-50um, and the reliability is good. The galvanized layer and the steel are metallurgically bonded and become a part of the steel surface. Therefore, the durability of the coating of the hot-dip galvanized angle steel is more reliable. . The raw material of hot-dip galvanized angle steel is angle steel, so it is classified the same as angle steel.

　　Cold galvanized angle steel

　　The cold galvanizing process is used to protect metals from corrosion. For this purpose, a coating of zinc filler is used. It is applied to the surface to be protected by any coating method. After drying, a zinc filler coating is formed. In the dry coating Has a high content of zinc (up to 95 percent). Suitable for repair work (i.e. during repair work, only where the protected steel surface is damaged and can be reapplied as soon as the surface is repaired). The cold galvanizing process is used for the anticorrosion of various steel products and structures.

　　Cold-dip galvanized coatings are mainly anti-corrosion based on electrochemical principles, so it is necessary to ensure sufficient contact between zinc powder and steel to generate a potential difference, so the surface treatment of steel is very important. Before spraying cold galvanizing, mechanical rust removal (sand blasting, shot blasting, etc.) should be selected to make the steel surface cleanliness reach IS0 8501-1 Sa 2.5 level, which is equivalent to GB 8923 Sa 2.5 level. Its text is defined as: "After the steel is mechanically derusted, the surface is free of oil, rust, scale and other dirt, or only slight traces are left: 95% of the steel surface is impacted by steel shot (sand) , exposing the luster of metal."

　　If cold-dip galvanizing is used as a separate film, as an anti-corrosion coating, the surface roughness can be controlled to be slightly smaller to ensure the coating thickness of cold-dip galvanizing; When the thickness is greater than 180 microns, in order to ensure the adhesion of the entire coating, the surface roughness Rz of the steel should be greater than 60 microns.

　　advantage:

　　1. Low processing cost: the cost of hot-dip galvanizing and anti-rust is lower than that of other paint coatings:

　　2. Long-term durability: Hot-dip galvanized angle steel has the characteristics of surface gloss, uniform zinc layer, no missing plating, no dripping, strong adhesion, and strong corrosion resistance. In the suburban environment, the standard hot-dip galvanized anti-rust thickness can be maintained More than 50 years without repairing; in urban areas or offshore areas, the standard hot-dip galvanized anti-rust layer can be maintained for 20 years without repairing;

　　3. Good reliability: the metallurgical bond between the galvanized layer and the steel material becomes a part of the steel surface, so the durability of the coating is more reliable:

　　4. The toughness of the coating is strong: the galvanized layer forms a special metallurgical structure, which can withstand mechanical damage during transportation and use;

　　5. Detailed protection: every part of the plated parts can be coated with zinc, even in the depressions, sharp corners and hidden places can be protected in detail;

　　6. Save time and effort: the galvanizing process is faster than other coating construction methods, and can avoid the time required for painting on the construction site after installation.

　　Appearance Quality:

　　The surface quality of angle steel is stipulated in the standard, and it is generally required that there should be no harmful defects in use, such as delamination, scarring, cracks, etc.

　　The allowable range of geometric shape deviation of angle steel is also stipulated in the standard, generally including bending degree, side width, side thickness, top angle, theoretical weight, etc., and it is stipulated that the angle steel must not have significant torsion.

　　use:

　　Galvanized angle steel is widely used in power towers, communication towers, curtain wall materials, shelf construction, railways, road protection, street light poles, marine components, building steel structure components, substation ancillary facilities, light industry, etc.