Anti corrosion treatment of chimney inner wall and removal of steel chimney

Anti corrosion treatment of chimney inner wall and removal of steel chimneySome metals in Hongshun Construction Engineering Co., Ltd. often form a dense oxide film due to oxidation, thereby blocking the corrosion of steel by water and air. Using chemical methods to form a fine and stable oxide film on the surface of steel. For example, forming a fine black film of iron oxide on the surface of machine parts, cannons, and other steel components. Using the principle of primary batteries to protect metals and attempting to induce electrochemical corrosion reactions in primary batteries. Electrochemical protection is divided into two categories: anodic protection and cathodic protection, with cathodic protection being the most commonly used. This method involves connecting active metals (such as zinc or zinc alloys) to the protected metal. When electrochemical corrosion occurs, this active metal acts as the negative electrode and undergoes an oxidation reaction, thereby reducing or preventing the corrosion of the protected metal. This method is commonly used to protect steel piles and ship hulls in water, such as the protection of steel gates in water. Typically, several zinc blocks are welded below the waterline of the ship's hull or on the rudder near the propeller to prevent corrosion of the hull. Connect the protected metal to the negative pole of the power supply.
Choose another conductive inert material to connect to the positive pole of the power supply. After being powered on, the accumulation of negative charges (electrons) on the metal surface is suppressed, thereby achieving the purpose of protection. This method is mainly used to prevent corrosion of metal equipment in soil, seawater, and river water. Another method of electrochemical protection is called anodic protection, which is the process of passivating the anode within a certain potential range by applying an external voltage. It can effectively block or prevent metal equipment from corroding in acids, alkalis, and salts. Corrosive media, such as regularly wiping metal equipment, placing desiccants in precision instruments, or adding a small amount of corrosion inhibitors that can slow down the corrosion rate to the corrosive media. Usually, metal surfaces are covered with dust, oil stains, oxide scales, rust layers, pollutants, salt content, or loose old paint films. Among them, oxide scale is a common but easily overlooked part. Oxide scale is a dense oxide layer produced during high-temperature forging and forming of steel. It usually adheres firmly, but is more brittle compared to the steel itself. Reply 24 hours a day
And it itself is a cathode, which accelerates metal corrosion. If these substances are not used for direct coating, it will inevitably affect the adhesion and anti-corrosion ability of the entire coating. According to statistics, over 70% of paint problems are caused by improper surface treatment. Therefore, for the performance of a metal anti-corrosion coating paint system, appropriate surface treatment is crucial. There are two representative standards for cleanliness: one is the "SSPC -" developed by the United States in 1985, and the other is the "Sa -" developed by Sweden in 1976, which is divided into four levels: SaSaSaa is a commonly used standard, and Sa1 level - equivalent to the SSPC-SP7 level in the United States. The use of general and simple manual brushing and sanding methods, which are the first level of moderate to low cleanliness, only provides slightly better protection for the coating than untreated workpieces. The technical standard for Sa1 level treatment: The surface of the workpiece should be free of visible oil stains, grease, residual oxide skin, rust spots, and residual paint and other contaminants.

Anti corrosion treatment of chimney inner wall and removal of steel chimney