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Home » News » How to choose between electro-galvanization and Dacromet?

How to choose between electro-galvanization and Dacromet?

Views: 173     Author: Site Editor     Publish Time: 2023-02-13      Origin: Site

1. About Dacromet

Dacrometprocess benefits from the maturity of the development of modern technology, is a new surface treatment method, there is a huge market value and a broad development space. The coating thickness of the coating of this anti-corrosion coating process is only 5-10um, although the cost is higher, but the anti-corrosion effect is several times than the electro-galvanization. Dacromet coating is a corrosion-resistant coating applied to the surface of the workpiece, divided into two kinds of chromium and chromium-free, its hardness is slightly lower, wear resistance is poor, at present there are more silver, but also black and other colors. The anti-corrosion effect of Dacromet coating is much better than galvanization. By doing experiments, Dacromet coated parts can pass the salt spray test of 1000 hours. The price of Dacromet coating solution is also much higher than galvanizing, and Dacrol coating solution is pollution-free, galvanizing pollution is serious, under the pressure of environmental pollution control, many parts began to use Dacromet surface treatment method. Many advantages of the Dacromet process have been explored and amplified, and it has become a process with a wide range of applications, especially for metal parts such as thin-plated metal fasteners, standard parts, and special parts that need to withstand high-temperature environments.


2. About galvanization

Galvanizing is divided into electro galvanizing and hot dip galvanizing, which is generally used for corrosion resistant coating, or painting primer (just from the process, which actually makes the surface coating to get a better appearance), electro galvanizing has a thicker film , usually 5-15um, and comes in several conventional colors of blue, multicolor, black, and military green, with corrosion resistance ranging from more than 10 hours to 100 hours and close to 200 hours in neutral salt spray test. The pollution of electrogalvanizing process is more serious than that of Dacromet process. The advantages of galvanizing over Dacromet are easy operation, low cost, low energy consumption, and better surface finish, so you can choose it if you consider these. High quality zinc plating with sufficient zinc content and excellent quality, suitable for outdoor fasteners and other parts of long-term corrosion requirements, hot dip galvanized is a protective coating, generally used in such as general highway guardrails, street lights, etc. general salt spray test easily over 500 hours, but the appearance is poor, the decorative places also needs to use paint and so on to get a better appearance.


3. Dacromet coating and electroplated zinc layer performance comparison table

Item

Performance

Dacromet coating

Electroplated zinc layer

Treating process

cleanliness

good

Fairly well

Non-pollution

best

bad

Non-hydrogen embrittlement

best

Fairly well- bad

Permeability

best

bad

Finished product inspection

Corrosion resistance (salt spray test)

best

Fairly well

Heat resistance

best

bad

Adhesion on coating (plating)

good

Fairly well

Weather resistance

good

Fairly well


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