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What is the anticorrosion principle of Dacromet coating ?

Posted on 2018-05-07
With the rapid development of modern production technology, more and more high-tech products have been put into use. Processing technology brings a lot of convenience to our life. Dacromet should be understood by many people.

 

Dacromet has applications in many industries. Dacromet technology is now combined with a lot of coatings. It can play a very good anti-corrosion effect on the surface of the product. So Why is it able to preserve the material?

 

Dacromet coating, appearance is matt silver-gray, composed of very fine sheet metal zinc, aluminum and chromate components. After the workpiece was deoiled and shot blasted, Dacromet was dip-coated.

 

Dacromet liquid is a kind of water-based treatment liquid. Metal parts are dip-coated or spray-brushed in a water-based treatment solution, then they are solidified in the furnace and baked at about 300° C. to form an inorganic coating of zinc, aluminum and chromium. When cured, the moisture in the coating film, organic (cellulose) and other volatile components volatilize, and the oxidizing property of the high-valent chromium salt in Dacromet's mother liquor makes the electrode potential have a large negative value. After the aluminum foil slurry and the iron matrix, a chromium salt compound of Fe, Zn, and Al is formed. Because the film layer is obtained directly after the substrate, the anti-corrosion layer is extremely dense. Under the corrosive environment, the coating will form numerous primary batteries, that is, the more negative Al and Zn salts will be etched away firstly until they are possible to corrode the substrate itself after it is consumed.