Analysis on the main methods of corrosion protection for metal tensile parts

What are the main methods of corrosion protection for metal tensile parts? The precise author tells you that you need to pay attention to several points in the production process of stretch parts: In today's society, stretch parts can be seen everywhere; the production process of stretch parts is also different. Among them, the stretch coefficient is one of the main technical parameters in the calculation of the production process of stretched parts, and is usually used to determine the sequence and number of stretches. There are many factors that affect the stretch coefficient m, including the characteristics of the stretched part, the relative thickness of the material, the stretching method (with or without the blank holder), the stretching time, the stretching speed, the punch radius and the die, lubrication, etc. In addition, in the production process of drawing parts, when tensile cracks occur, apply lubricant on the die (not in the punch), and apply a 0.013-0.018 mm plastic film on the die side of the workpiece. During the stretching process, cold work hardening occurs due to the cold plastic deformation of the workpiece, thereby reducing its plasticity and increasing its deformation resistance and hardness. In addition, unreasonable mold design requires intermediate annealing to soften the metal and restore plasticity. Annealing is usually carried out at low temperatures. There are two points to note in annealing: decarburization and oxidation. After the workpiece is oxidized, the oxide scale will reduce the effective thickness of the workpiece and increase the wear of the mold. When the company does not have the conditions, the general annealing method is generally adopted. In order to reduce the generation of oxide scale, the furnace should be fully annealed as much as possible. 1. Change the internal structure of the metal. For example, chromium and nickel are added to ordinary steel to make stainless steel. 2. Cover the metal surface with a protective coating. For example, spraying, electroplating or chemical methods on the metal surface to form a dense and corrosion-resistant oxide film. Electrochemical protection. Because metals have no electrons, the galvanic reactions that cause electrochemical corrosion of metals can be removed by using protected metals as the cathodes of reduction reactions in electrochemical devices. The specific methods are: A, impressed current cathodic protection. The metal to be protected is connected to the negative electrode of the power supply through the electrolysis device, and the inert electrode is used as the anode. As long as the applied voltage is strong enough, the metal to be protected will not be corroded. B, the cathodic protection of the sacrificial anode. A new type of galvanic battery is composed of a protected metal and another metal that is more likely to lose electrons through the use of a galvanic device. When a galvanic reaction occurs, the crude metal is used as the positive electrode (ie, the cathode), which is protected and corroded by the external active metal-the negative electrode (ie, the anode). C. Corrosion inhibitors can slow down or prevent the corrosion of metal parts. Guangdong Precision Co., Ltd. is a manufacturer of precision metal and plastic parts. In order to ensure the high precision and accuracy of mass-produced parts, all of our progressive molds and plastic molds are developed, manufactured and used in production by our own team. In addition, we have also established an automation team to independently research and develop assembly automation equipment to achieve full-process automated production. [Related recommendation] Learn more: 精の corporate culture Learn more: Continuous improvement and innovation are the key factors for the survival of stamping companies Learn more: The development of the metal stamping processing industry