Скачать или смотреть Hardware polishing process

Galvanizing and polishing are two common processes for metal surface treatment, which are usually used to improve the corrosion resistance, appearance and durability of metals. The following is a detailed introduction to these two processes:

1. Galvanizing process

The main purpose of galvanizing is to improve the corrosion resistance of metals, especially in humid environments. Galvanizing prevents rust by covering the metal surface with a layer of zinc. There are two main methods of galvanizing:

Hot-dip galvanizing: During the hot-dip galvanizing process, metal workpieces (such as steel) are heated to a certain temperature and then immersed in a molten zinc pool to form a protective layer of zinc. This method is suitable for large-scale production and larger-sized items and has strong corrosion resistance.

Electrogalvanizing: Electrogalvanizing is the deposition of zinc onto the metal surface by electrolysis. It is usually used for smaller or complex-shaped parts, with a thinner coating, and is suitable for surface treatments that require higher precision.

The thickness and uniformity of the zinc coating are crucial to its anti-corrosion effect. Common galvanized items include building materials, automotive parts, and some home appliance accessories.

2. Polishing process

Polishing process is mainly used to improve the smoothness and glossiness of metal surface, remove surface unevenness, oxide or corrosion layer, and is usually used to improve the appearance of metal. There are several polishing methods, the common ones include:

Mechanical polishing: Use rotary polishing machine, sandpaper, polishing wheel and other equipment to remove surface irregularities by friction and grinding. This method is often used for gloss treatment of metal surfaces such as stainless steel and aluminum alloy.

Chemical polishing: Treat the metal surface with chemical solution to make it smooth and shiny. This method is suitable for the meticulous treatment of metal parts, especially when the shape is complex or large-scale processing is required.

Electrolytic polishing: Electrolytic polishing removes small particles on the metal surface by placing the metal part as the anode in the electrolyte under the action of electric current to achieve a smooth and mirror effect. It is often used for high-quality surface treatment of metals such as stainless steel.

Combining the advantages of galvanizing and polishing:

Corrosion resistance: The galvanized layer can effectively prevent the metal from rusting, while the polishing layer can enhance the aesthetics and reduce surface impurities.

Appearance: The polished metal surface is usually brighter and has a certain mirror effect, which is very important for some decorative and high-end products.

Extended service life: The anti-corrosion effect of galvanizing and the surface finish of polishing work together to improve the service life and functionality of metal parts.