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DIN 603 Precautions for bolt anticorrosive maintenance layer DIN 603 bolt protection shall meet the following requirements: 1.Corrosion resistance, wear resistance, high hardness, 2. Tight structure, no defects and small pores. 3. Strong separation and good adhesion from the base metal. 4. Spread evenly and have a certain thickness. The protective layer is generally divided into two types: metal coating and non-metal coating. Metal coating refers to the use of a metal or alloy with strong corrosion resistance to form a protective layer on a simple corroded metal surface. This coating is also called plating. There are many methods and types of metal plating. Among them, electroplating is the most common method, followed by molten metal dip plating (hot dip plating) and chemical surface treatment. Non-metallic coating refers to the use of organic polymer materials such as paint, and inorganic materials such as ceramics to form a protective layer on the surface of metal equipment or parts.The protective layer can prevent the base metal from being separated from the environmental medium and prevent the base metal from being corroded by touch. Corrosion in the medium of stainless steel gauge parts. If you are looking for a professional and reliable manufacturer of Square Bolt, Haiyan Yihui Hardware Technology Co., Ltd. is a good choice for you. Welcome customers to leave messages and inquiries.