What are the characteristics of electro galvanizing of precision stamping parts in automobile industry?

2021-12-14 09:45:19

The galvanized surface of precision stamping parts is a little cyan white, and the luster is not very bright. Play the role of decorative effect.

Galvanizing is to coat a layer of zinc metal from several microns to more than ten microns on the surface of galvanized parts. It is an anodic coating for iron base, which has certain electrochemical protection, and galvanized parts have good rust resistance. Due to the electrochemical characteristics of zinc, it has a "sacrificial" protective effect on the steel matrix; The corrosion product (basic zinc carbonate) of the zinc layer in the atmosphere is relatively dense, well attached and insoluble in water. Automobile stamping parts have a certain protective effect on the zinc layer. Therefore, galvanizing is widely used to protect steel and its parts from atmospheric corrosion, especially for mass production of precision metal stamping parts.

The materials often used in stamping processing are metal sheets and non-metallic sheets. There are two kinds of metal sheets: ferrous metals and non-ferrous metals.

Common stamping materials include ordinary carbon structural steel plates, such as Q195, Q235, etc. Electrical silicon steel plate, such as dt1 and DT2.

High quality carbon structural steel plate, which has guaranteed chemical composition and mechanical properties. Among them, low carbon steel is widely used, and the commonly used brands are: 08, 08F, 10, 20... With good stamping and welding properties, which is suitable for manufacturing stamping parts with little stress.

Low alloy structural steel plate, commonly used models: Q345 (16Mn), q295 (09Mn2). It is suitable for manufacturing important stamping parts with strength requirements.

Stainless steel plates, commonly used: 1Cr18Ni9Ti, 1Cr13, etc., are suitable for manufacturing parts with anti-corrosion and rust requirements.

Non ferrous metals, such as copper and copper alloys (such as brass), have grades T1, T2, H62, H68, etc. Good plasticity, conductivity and thermal conductivity. There are also aluminum and aluminum alloys. The commonly used brands are L2, L3, LF21, LY12, etc., which have good plasticity, small deformation resistance and light total amount.

Non metallic materials, such as plywood, rubber, plastic plate, etc.

Sheet metal is often used for the shape of precision stamping materials, and special coil materials are used for mass production and processing. Special blocks can be used, which is more suitable for single piece small batch production and stamping of expensive non-ferrous metals.