The distinctive feature of aluminum alloy hot rolling is that it is covered with an "aluminum film". This "aluminum film" consists of aluminum oxide, 10% to 15% aluminum powder, lubricant and carbon residue. The properties of aluminum rolling oil and coating selection are crucial to the surface quality of aluminum materials and determine the state of the aluminum film on the roll surface. During the rolling process, high temperature, high pressure and the chemical activity of the emulsion separate the oil from the emulsion, forming a uniform oil film on the work roll surface to prevent direct contact between the work roll and the rolled piece. The roller exerts pressure on the rolled piece through the oil film, causing the metal to plastically deform. At the same time, aluminum particles are transferred from the rolled piece to the rolling surface to form an "aluminum film", that is, an aluminum-adhesive layer. When the lubricant has good performance, the aluminum-adhesive layer is thinner, but it may still be reflected on the rolled parts. If lubrication is not properly controlled, aluminum particles will be seriously adhered to the surface of the roll and exposed on the rolled piece. As production continues, the aluminum-adhesive layer thickens, and the instability of the aluminum particles increases. They fall off from the roll surface and form a new aluminum film, resulting in serious streaks on the roll surface. When rolling soft aluminum on site, after rolling about 4 pieces of material, the aluminum sticking defect will become obvious. If not handled in time, the aluminum particles will fall off the surface of the roll during the rolling process and be pressed into the surface of the aluminum material, forming metal intrusion. , the surface will peel, holes and other problems will appear after cold rolling. Many factories use boron nitride coatings to prevent aluminum from sticking during the hot rolling process and to protect molds and aluminum alloy surfaces. Boron nitride water-based coating is suitable for the protection or lubrication of metals, glass, ceramics, compounds and plastics. It can withstand temperatures up to 982°C (oxidizing atmosphere), 1399°C (vacuum environment) and 1816°C (inert environment). It can be sprayed , dip coating or flow coating. The paint dries to a smooth surface, and different formulations produce surfaces with different hardnesses. Some offer corrosion and wear resistance, and soft film coatings provide lubrication and non-wetting properties. It is non-wetting and releasable to molten aluminum, magnesium and their residues, and is suitable for melting, casting, forging, hot rolling, drawing, stamping, forming and other processes. If you have any questions about Boron Nitride，feel free to connect with us.. Product page:https://www.ceramic-solutions.com/Boron-Nitride.html Contact page:https://www.ceramic-solutions.com/Contact.html
