Environmental protection metal coating is a new type of anti-corrosion coating technology, which has quickly entered the market because of its many advantages that cannot be compared with traditional electroplating. It has established a complete surface treatment system, and after more than 20 years of development and improvement, it is widely used in metal Surface anti-corrosion treatment.
In developed countries, Dacromet environmental protection metal coating anti-corrosion technology has been used as anti-corrosion technology for many traditional processes. Dacromet technology has certain advantages and can avoid traditional electro-galvanizing and hot-dip galvanizing technology problems such as hydrogen embrittlement. Therefore , it has been widely used since the 1970s. Let's take a look at the details of the advantages and applications of this new coating technology:
First, the advantages of environmentally friendly metal coating
The specific performance is as follows.
1, Good corrosion resistance.
In the salt spray test, it takes at least 200 hours to etch the unpassivated galvanized layer with a 3 micron thick passivation film in 1 hour, and the efficiency of Dacromet treatment technology is at least 7-10 times higher than that of electroplating.
2, good moisture resistance.
After 10 tests of the 240-hour cycle test at a temperature of 35 degrees Celsius ± 2 degrees Celsius and a humidity of 95%, there was no change in the surface of the Dacromet coating.
3, High temperature resistance and low temperature impact resistance.
At -45°C to 85°C, keep the sample in the high and low temperature test chamber for 1 hour, the transformation time is not more than 5 seconds, the number of cycles is 3, and there is no change in 2 coatings.
4, The adhesion between the coating and the substrate is good.
In the above-mentioned damp heat test environment, the adhesion between the Dacromet coating and the paint film reached the national first-level and second-level standards, and the adhesion between the Dacromet coating and the substrate reached the first-level standard.
5, Relieve hydrogen embrittlement
Hydrogen embrittlement is a shortcoming that the traditional galvanizing process cannot completely overcome. Generally speaking, the electroplating process uses pickling, electrode dipping, electrodeposition and other processes, which lead to hydrogen embrittlement of the workpiece and seriously affect the quality of high-strength parts. Dacromet technology is used in the treatment of There is no acid treatment in the process, so there is no hydrogen permeation problem during the plating process, which makes it suitable for corrosion protection of workpieces with high tensile strength requirements.
2, the application of environmental protection metal coating
The basic material range of Dacromet technology includes steel and non-ferrous metals, such as aluminum, magnesium and their alloys, as well as copper, nickel, zinc, etc. and their alloys.
Dacromet's environmentally friendly metal coating anti-corrosion technology can replace various surface protection processes. At present, Dacromet's environmentally friendly metal coating anti-corrosion technology has been applied in various industries.
