Surface Treatment--What is Dacromet?
author: YITECH
2025-02-21
Do you know what is Dacromet surface treatment? Dacromet is a high-performance coating that provides exceptional corrosion resistance for our industrial products, now follow me to learn more about Dacromet.
1. Basic overview
Definition: Dacromet is a new type of anti-corrosion coating with zinc powder, aluminum powder, chromic acid and deionized water as the main components, also known as zinc-chromium coating.
Origin: Originally developed by American scientist Mike Martin to solve the problem of chloride ion corrosion of steel substrates.
Development: After the technology was adopted by the US military, it was gradually promoted and applied worldwide, especially in Japan after being improved and developed rapidly.
Origin: Originally developed by American scientist Mike Martin to solve the problem of chloride ion corrosion of steel substrates.
Development: After the technology was adopted by the US military, it was gradually promoted and applied worldwide, especially in Japan after being improved and developed rapidly.
2. Main ingredients
The Dacromet coating solution mainly includes the following ingredients:
Metal powder: Zinc powder and aluminum powder are the main components of the coating, which protect the substrate in a corrosive environment.
Solvent: Usually an inert organic solvent, such as ethylene glycol, used to dissolve and disperse other ingredients.
Passivator: Mainly chromic anhydride, chromate, dichromate and their mixtures, which form a dense passivation film during the sintering process to improve the corrosion resistance of the coating.
Special organic matter: such as cellulose white powder, as a thickening and dispersing agent for the coating.
Solvent: Usually an inert organic solvent, such as ethylene glycol, used to dissolve and disperse other ingredients.
Passivator: Mainly chromic anhydride, chromate, dichromate and their mixtures, which form a dense passivation film during the sintering process to improve the corrosion resistance of the coating.
Special organic matter: such as cellulose white powder, as a thickening and dispersing agent for the coating.
3. Anti-corrosion mechanism
The protective effect of Dacromet coating on steel substrate is mainly reflected in the following aspects:
Barrier effect: The overlapping of flaky zinc and aluminum layers prevents corrosive media such as water and oxygen from reaching the substrate.
Passivation: Chromic acid reacts chemically with zinc, aluminum powder and substrate metal to form a dense passivation film.
Cathode protection: The zinc-aluminum-chromium coating provides cathodic protection to the substrate, similar to the effect of zinc plating.
Passivation: Chromic acid reacts chemically with zinc, aluminum powder and substrate metal to form a dense passivation film.
Cathode protection: The zinc-aluminum-chromium coating provides cathodic protection to the substrate, similar to the effect of zinc plating.
4. Advantages
Compared with traditional electroplating process, Dacromet surface treatment technology has the following advantages:
Super corrosion resistance: The anti-rust effect is more than 7-10 times that of traditional galvanizing, hot-dip galvanizing or paint coating.
No hydrogen embrittlement: There is no pickling and activation process in the treatment process, which avoids hydrogen embrittlement.
High heat resistance: The heat resistance temperature can reach more than 300℃, which is much higher than the traditional galvanizing process.
Good bonding and re-coating performance: It has good bonding with the metal substrate and is easy to spray and color.
Good permeability: can enter the deep holes, slits and other parts of the workpiece to form a coating.
No pollution and public hazards: no wastewater and waste gas are discharged during the production, processing and coating process, which meets environmental protection requirements.
No hydrogen embrittlement: There is no pickling and activation process in the treatment process, which avoids hydrogen embrittlement.
High heat resistance: The heat resistance temperature can reach more than 300℃, which is much higher than the traditional galvanizing process.
Good bonding and re-coating performance: It has good bonding with the metal substrate and is easy to spray and color.
Good permeability: can enter the deep holes, slits and other parts of the workpiece to form a coating.
No pollution and public hazards: no wastewater and waste gas are discharged during the production, processing and coating process, which meets environmental protection requirements.
5. Disadvantages
Although Dacromet has many advantages, it also has some shortcomings:
Some Dacromets contain chromium ions that are harmful to the environment and human body, especially hexavalent chromium ions, which are carcinogenic.
The sintering temperature is high, the time is long, and the energy consumption is large.
The surface color of the coating is single, mainly silver-white and silver-gray, which is not suitable for personalized needs such as automobiles.
The coating has poor conductivity and is not suitable for parts with conductive connections.
6. Application Scope
Dacromet surface treatment technology is widely used in the following fields:
Automobiles and motorcycles: used for various high-strength chassis parts, metal parts around the engine, etc.
Electrical and electronic: surface treatment of parts of high-end products such as household appliances and electronic products.
Infrastructure: anti-corrosion treatment of metal parts such as subway tunnels, railways, bridge viaducts, and highways.
Other industrial fields: such as electricity, chemical industry, marine engineering, military industry, etc.
Electrical and electronic: surface treatment of parts of high-end products such as household appliances and electronic products.
Infrastructure: anti-corrosion treatment of metal parts such as subway tunnels, railways, bridge viaducts, and highways.
Other industrial fields: such as electricity, chemical industry, marine engineering, military industry, etc.
If you want to learn more knowledge about surface treatment, follow YITECH. If you are looking for Dacromet surface treatment service, please feel free to contact us, and we are wellcome to working with you!
DongGuan YiTai Electronic Technologies Co.,Ltd
DongGuan YiTai Electronic Technologies Co.,Ltd is a manufacturing service provider located in Dongguan, China.
YiTai specialized in CNC turning machining and sheet metal fabrication mainly. As a member of Hung Mou Group, we focus on the overseas marketing development. And based on our parent company’s manufacturing capability and resources, YiTai also expended machining services such as die casting, injection molding, aluminum profile extrusion, 3D printing, which are committed to providing customers with one-stop purchasing services and experience.
CNC MACHINING , CNC MILLING , CNC TURNING , SHEETMETAL , FASTENER , OTHERS
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