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03

2023

Common surface treatment processes for precision sheet metal parts

Due to the fact that some sheet metal materials themselves do not have the ability to prevent rust and corrosion, they need to undergo surface treatment to achieve their objectives. Common surface treatment processes for steel plates Electrogalvanizing: The process of forming a uniform, dense, and well bonded metal or alloy deposition layer on the surface of a workpiece by electrolysis. Compared with other metals, zinc is a relatively inexpensive and easy to plated metal, belonging to a low value anti-corrosion electrodeposit. It is widely used to protect steel parts, especially against atmospheric corrosion, and for decoration. Plating technology includes bath plating (or hanging plating), barrel plating (suitable for small parts), automatic plating, and continuous plating (suitable for wire and strip). According to the classification of electroplating solutions in China, they can be divided into four categories: Cyanide zinc plating Due to the highly toxic nature of (CN), environmental protection has imposed strict restrictions on the use of cyanide in zinc electroplating, continuously promoting the development of cyanide reduction and replacement electroplating solution systems, requiring the use of low cyanide (micro cyanide) electroplating solutions. After adopting this process for electroplating, the product quality is good, especially for color plating, and the color remains good after passivation. Zincate zinc plating This process is evolved from cyanide zinc plating. Currently, there are two major factions in China, namely: a) the "DPE" series of Wuhan Material Protection Institute; b) "DE" series of radio and television stations. Zincate zinc plating, which belongs to alkaline additives; The PH value is 12.5~13. Using this process, the lattice structure of the plating layer is columnar, with good corrosion resistance, and is suitable for color galvanizing. Chloride zinc plating

03

2023

Types and production process of hardware elastic pieces

The production of metal shrapnel is a special process for cold stamping materials (metal or non-metal) into parts (or semi-finished products) through stamping molds. Its types are complex and diverse, and can be divided into spiral metal shrapnel, scroll metal shrapnel, plate metal shrapnel, etc. according to shape. It can also be divided into plastic metal shrapnel, stainless steel metal shrapnel, copper metal shrapnel, iron metal shrapnel, aluminum stainless steel shrapnel, etc. according to material. Most of them are made of metal spring steel, which plays a high-quality switching role between products by virtue of the conductivity of the metal spring. In the classification of hardware shrapnel, battery shrapnel and mobile phone hardware shrapnel are widely used: 1. Battery shrapnel: Battery shrapnel is one of the metal shrapnel, mainly made of stainless steel shrapnel, copper shrapnel, and iron shrapnel. Due to its good conductivity and elasticity, copper is generally used. 2. Mobile phone hardware shrapnel: It is also a type of hardware shrapnel, mainly used in mobile phones, and generally made of copper.

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