Steel structure is one of the most commonly used building structures. Proper maintenance of the steel structure will greatly extend the service life of the steel structure. Therefore, steel structure maintenance personnel should do regular inspection and maintenance of steel structures in daily life to ensure the safety of users.
The daily protection of steel structures include corrosion and fire protection. Steel is a small weight, high strength building materials, alone if you do not pay attention to protection, it will greatly reduce the carrying capacity of steel structures and service life. Corrosion of steel structures is mainly caused by the unprotected or improperly protected surfaces of steel structures affected by the surrounding oxygen, chlorine and sulphides. According to the existing survey data, the speed of corrosion of steel structure and the environment in which the house is located has a great relationship. In the presence of harmful substances in the air (such as sulfuric acid, hydrochloric acid, etc.), the steel structure is easy to rust. Air temperature, humidity and harmful gas content, the structure of the topography of the high and low and so have an impact on the corrosion of steel structures. Among them, the air humidity and harmful gas concentrations have the greatest impact on steel corrosion. When contaminated air and water co-act on the surface of the structure, the steel structure will be severely corroded by electrochemical reaction.
The corrosion of building steel structure is mainly electrochemical corrosion. Because the steel in the smelting process, according to the needs of steel properties and added a certain amount of carbon or other elements. The main iron and steel joined the other elements of the standard electrode potential is different, so the formation of primary batteries. Atmospheric moisture, oxygen and other media so that the innumerable primary batteries within the steel structure to form access. Iron becomes the anode to lose electrons and turn it into rust. Atmospheric moisture or other acid gases are the root causes of steel corrosion.
According to the corrosion mechanism of steel structure, steel rust-proof method is divided into 4 kinds. First, change the composition of the steel structure. That is included in the process of steel smelting copper, chromium and other alloying elements to improve the anti-rust ability of steel, which is stainless steel, because the cost is too high, it is difficult in a large number of applications. Currently only for small decorative projects. Second, the cathodic protection method, the components will be connected to the cathode of the power supply, so that the electronic components have been added to complement the internal balance of the steel has always maintained without rust. This method is currently only used for the protection of underwater or underwater structures. Third, the surface of the component with a metal cover protection, such as plating or hot galvanized and other methods, generally used for sheet metal or small diameter decorative pipe, such as grid with steel pipe. Fourth, the surface of the steel sprayed with non-metallic protective layer, cut off the steel in contact with the air to achieve the purpose of rust prevention, this method of construction is convenient, the cost is relatively low, so advertising works in the project, single durability is poor, usually a few years later Spray again.
Through the above method, adhere to the routine maintenance of steel structure, maintain good steel structure.
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