A brief introduction of galvanizing process
Galvanizing is a method of corrosion prevention that involves coating the surface of metals, alloys, or other materials with a layer of zinc. Zinc is a reactive metal that forms a dense basic zinc carbonate film in air, which effectively protects the internal metal from further oxidation and corrosion. Therefore, the main purpose of galvanizing is to enhance the corrosion resistance of metal products, increase aesthetics, and extend their service life. There are various methods for galvanizing, mainly including hot-dip galvanizing and cold galvanizing (electroplating). 1-1 Hot dip galvanizing: also known as hot-dip galvanizing or hot-dip galvanizing. This method involves immersing the rust removed steel parts in molten zinc solution, and through the reaction and diffusion between zinc and iron, a uniformly dense alloy coating with strong adhesion is formed on the surface of the steel parts. This coating not only has good corrosion resistance, but also has certain adhesion and toughness, which can be applied to various strong acid, alkali mist and other strong corrosive environments. 1-2 Cold dip galvanizing (electroplating galvanizing): Unlike hot-dip galvanizing, cold dip galvanizing deposits a layer of zinc or zinc alloy on the metal surface through electrochemical methods. This method is usually carried out in electroplating tanks, where zinc ions in the plating solution deposit on the surface of the metal to be plated under the action of an electric field, forming a uniform coating. The coating of cold galvanizing is relatively thin, but it has a shiny appearance and can provide good corrosion resistance and decorative properties Galvanizing process is a surface treatment technique that involves depositing a layer of zinc on a metal surface, with the aim of improving its corrosion resistance and aesthetics.
The following is a detailed analysis of galvanizing process: 02. Overview of galvanizing process Galvanizing process is widely used in the production of hanging galvanizing and rolling galvanizing. The coating is soft, has high brightness, and is easy to undergo chromate passivation treatment. Within a wide range of current densities, the galvanizing process can obtain bright coatings, which are suitable for low cyanide galvanizing and help reduce environmental pollution. In addition, the galvanizing process has a wide range and is easy to operate and control. Most cyanide galvanizing processes can directly supplement brighteners for cylinder rotation. 2-1 Main methods of galvanizing process 2-1-1 Hot dip galvanizing: Process: Dip the pre treated steel into molten zinc solution, and the zinc reacts with the steel surface to form a zinc iron alloy layer and a pure zinc layer. Features: Thick coating, superior anti-corrosion performance, strong adhesion. 2-1-2 Electrogalvanizing (Cold Galvanizing): Process: Using the principle of electrolysis, deposit a layer of zinc or zinc alloy on the surface of steel. Features: The coating is thin, the appearance is bright, and it is suitable for occasions that require a certain level of aesthetics. 2-1-3 Spray galvanizing: Process: Spray zinc powder onto the surface of the steel, and then melt the zinc powder into a zinc layer through baking. Features: Flexible process, suitable for complex shapes and parts that are difficult to hot-dip or electroplated with zinc. Taking electroplating galvanizing as an example, the typical process flow includes: chemical degreasing → hot water washing → water washing → electrolytic degreasing → hot water washing → water washing → strong corrosion → water washing → electroplating galvanized iron alloy → water washing → polishing → passivation → water washing → drying. Each step is crucial to ensure the quality and adhesion of the coating.
Suzhou Pharma Machinery Co.,Ltd.
2025/03/28
Gino
