What Is "Adhesion" in Porcelain Enamel Industry?

The adhesion of enamel products refers to the mutual penetration and combination between the porcelain layer and the metal body, and the strength of this combination is called the adhesion strength. The adhesion of enamel products with ferrous metal as the body is achieved through the adhesive in the enamel. The adhesion strength is closely related to the type and content of the adhesive introduced. In addition, the surface state of the metal, the viscosity of the enamel, and the surface tension also have a great relationship with the adhesion strength.

The process of adhesion between porcelain layer and metal is very complicated. Many scientists and scholars have conducted long-term exploration and research on adhesion theory, and created many theories about adhesion. Although these theories have not yet been completely unified, they are important to our understanding The mechanism of adhesion and improving the adhesion strength of products still have certain guiding significance.

There are currently several popular theories about adhesion, including the formation of dendrite iron theory, mechanical adhesion theory (the metal surface is rough and uneven, when the enamel product is fired, the enamel ground coat melts and penetrates into the unevenness of the metal blank And produced adhesion), iron oxide intermediate theory (iron oxide formed on the metal surface penetrates into the metal body and porcelain layer to form adhesion), electrochemical theory, cobalt reduction theory, oxygen bridge theory, interface redox theory, intermetallic bond theory, etc.

In addition to the above-mentioned theories about enamel adhesion, there are many, some of which are being further explored and studied. Nolifrit is a supplier of enamel frits and inorganic pigments. It has been focusing on enamel frits for 26 years. If you have any industry-related questions, please contact us!