Application of magnesium alloy material etching plate(two)

The large-format etched magnesium board can be corroded layer by layer up to four times to form a deep embossed template with rich layers, fine lines, different depths, and clear stripes. It is used in wine box packaging, moon cake boxes, gift boxes, cosmetics, Deep embossing and bronzing of thick paper such as book cover and back cover.

The refraction embossed pattern on the corroded magnesium plate can be directly brushed out with a plate brush in 5 degrees nitric acid. The corrosion speed is very fast and the operation is simple. It saves the process of entering the corrosion machine for corrosion.

In particular, after exposing multiple films at the same time, they will be corroded at one time, with clear lines and rich layers, which saves the process of de-glueing, spraying, exposing and corroding the magnesium plate. Save labor and time.

After the magnesium plate is rolled by the hot rolling mill and tempered, the thickness is uniform and the thickness tolerance is extremely small. The magnesium plate has basically no anisotropy, which eliminates the internal stress of the plate. In addition, the yield strength of the etched magnesium board is more than 200MPa, which is stronger than the rigidity. Therefore, whether it is in the process of hot stamping and bumping after the board is glued, or after the board is held for a period of time before use, if the operation is proper, the Yinhe etched magnesium board There will be no deformation phenomena such as edge curling, middle bulging, and layout distortion.

In the production industry of New Year pictures, couplets, blessings, invitations and other products, the speed and efficiency of hot stamping determine the cost of the product, and the huge production volume produces economies of scale. Etched magnesium plates are being used more and more because of their remarkable advantages of fast heat transfer, no deformation and high printing durability.

In Disu, leather embossing, high-frequency molds, heat transfer, clothing trademarks and logos, self-adhesive knife molds, shoe sole molds, conference logos, house logos, medals, nameplates, product trademarks, badges, Braille signs and other products, Etched magnesium plates are also widely used abroad.

The specific gravity of magnesium is 1.738, with a hexagonal lattice structure inside, and its specific gravity is 1/5 of copper and 1/4 of zinc. The etched magnesium board has advantages in transportation, installation and sticking, storage, etc. due to its small quality and light weight.

The heat capacity ratio of magnesium is small, and the heating and cooling speed is very fast. In the actual bronzing process, the etched magnesium plate can quickly transfer the heat through conduction within a limited time, making the bronzing effect better and brighter; In addition, after a hot stamping is completed, the heat of etching the magnesium plate is transferred out, the temperature will be significantly reduced, and the slightly expanded volume will shrink, so that there will be no significant expansion and deformation; while the copper plate will slowly dissipate when heated. , The volume expansion is larger, the edge is softened, this is a significant advantage of magnesium plate compared to copper plate. The linear thermal expansion coefficient of etched magnesium plate is 26, copper plate is 17.5, and zinc plate is 36.

The Brinell hardness of the etched magnesium plate (material of AZ31b) is 110, the brass plate (H59) is 95, and the zinc plate is 49. The surface hardness of magnesium plate is twice that of zinc plate, and is significantly higher than that of brass plate. If it is corroded magnesium board made of AZ80, its surface Brinell hardness value reaches 140.

The etched magnesium plate adopts a magnesium alloy plate that is fully purified and completely crushed to a particle size of 5 microns (99%), and the internal composition of the material is uniform, stable and defect-free. In the nitric acid solution, the magnesium plate can be corroded uniformly and at a constant speed.

In the magnesium plate corrosion machine, due to the fierce and fast reaction between the etched magnesium plate and nitric acid, a lot of heat is released and yellow gas is generated. The yellow gas is nitrogen oxide, so pay attention to the exhaust air in the corrosion machine. The temperature inside the machine rises quickly. It is the heat generated when the magnesium plate reacts with nitric acid and cannot be discharged in time. The treatment method is to increase the effective refrigeration capacity of the refrigeration equipment, or lower the starting temperature as appropriate based on experience.

Etched magnesium plate, after being corroded by nitric acid, a dense and continuous oxide layer can be formed on the surface to prevent the internal magnesium metal from continuing to react. Due to the good purification of the material, there are basically no slag spots on the exposed surface of the magnesium plate (the slag spots will cause galvanic reaction and further corrode the magnesium plate), and it will not be corroded if it is placed in the air for a long time.