The welding treatment technology for stainless steel water tanks: After welding, there is varying degrees of oxidation inside and outside the weld seam and near the weld seam, which can easily cause corrosion of the stainless steel water tank. During the stainless steel processing, black oxide scale is produced after rolling, bonding, welding, or artificial surface heat treatment. This hard gray black oxide skin is mainly composed of NICR2O4 and NIF, two EO4 components. Previously, hydrofluoric acid and nitric acid were commonly used for strong corrosion removal. However, this method has the advantages of high cost, environmental pollution, harm to human health, and strong corrosiveness, and is gradually being phased out. Due to the visible oxidation in the color changing area, the corrosion rate is related to the thickness of the oxide layer. Compared with the oxide layer before stainless steel welding, the oxide layer in the discolored area is thicker and the composition changes (nickel chromium reduction), thereby reducing the local corrosion resistance. In general, when stainless steel water tanks are used for domestic water tanks, fire water tanks, softened water tanks, and other purposes, there is no need to treat the welds. In industrial or other harsh conditions, after welding, post weld treatments such as acid washing and grinding are often required to remove the oxide layer (coloring) and restore corrosion resistance. The commonly used treatment methods are mainly divided into mechanical treatment and chemical treatment. In addition, there are mirror polishing treatment and surface coloring treatment. Mechanical treatment: Typically, mechanical or non mechanical contamination of surfaces is used. Lubricating oil may cause organic pollutants. Contact with tools may result in inorganic contaminants, such as foreign iron particles. In general, various surface contaminations can lead to pitting corrosion. In addition, the addition of iron particle fields may lead to electrochemical corrosion. Both pitting corrosion and electrochemical corrosion are localized corrosion that require water treatment first. Therefore, surface contamination usually reduces the corrosion resistance of stainless steel. Surface treatment methods: In order to treat the surface, remove discoloration, and restore corrosion resistance, there are many post-treatment methods and means. We should distinguish between chemical methods and mechanical methods here. Chemical method: Non polluting acid pickling passivation paste and room temperature cleaning solution containing inorganic additives are used. Thus achieving the goal of whitening the natural color of stainless steel. After processing, it basically looks like a dull color. This method is suitable for large and complex products. According to the complexity of stainless steel products and the different requirements of users, mechanical polishing, chemical polishing, electrochemical polishing and other methods can be used to achieve mirror gloss. Stainless steel coloring not only endows stainless steel products with multiple colors, increasing design diversity, but also improves their wear resistance and corrosion resistance, such as chrome silver powder paint. Stainless steel has unique characteristics such as strength, high wear resistance, excellent corrosion resistance, and resistance to rusting. Therefore, it is widely used in industries such as chemical, food machinery, electromechanical, environmental protection, home appliances, home decoration, and fine decoration, giving people a luxurious feeling. The application and development of stainless steel will become increasingly widespread, but the application and development of stainless steel largely determine the development of its surface treatment technology. Scsxccom20210809