Application of magnesium alloy material etching board

After the etched magnesium plate was put on the market in the early 1970s, its superiority was recognized; later with the vigorous development of the printing and packaging industries, it was popularized and widely recognized in the field of high-end hot stamping printing; in recent years, due to strict environmental protection requirements With the intensified competition, printing companies’ requirements for high-quality metal template materials continue to increase. Its applications are increasing, and the number of applications and applications are growing rapidly, and there is a trend of catching up and replacing traditional copper and zinc plates. .

The low melting point and active chemical properties of magnesium are the difficult problems and bottlenecks of magnesium alloying; the close-packed hexagonal structure of magnesium has few slip systems and poor deformation performance at room temperature; the preparation of high-performance deformed magnesium plates also requires Multi-pass isothermal isomorphic angular rolling makes its processing cost high, which is also the reason that limits its rapid popularity.

Magnesium plate has a small specific gravity, light weight, fast heat conduction, heat transfer and heat dissipation, high surface hardness, easy demolding; and in the hot stamping process, it has almost no deformation and high printing resistance; fast corrosion speed, neat and continuous slope Good sex, smooth edges.has many advantages as a metal material for corrosion, so that it is widely used in the fields of printing, packaging, nameplate, decoration, etc. worldwide.

　　In the paper product packaging industry, it is used as a hot stamping plate and a bumper plate. For the same size template, the weight of the magnesium board is relatively light, and it is convenient and quick to transport, install and glue the board. The heat capacity ratio is small, the bronzing effect is good, the gold characters are bright, the pattern is fine and shiny. In particular, its hot stamping speed is much faster than copper and zinc plates, and its printing durability is 20% higher than that of copper plates, which can effectively increase the processing speed and save labor costs. In the wine box paper packaging industry, it can be used as a concave and hot stamping template. Its good printing resistance and heat transfer speed can greatly improve work efficiency.

The large-format etched magnesium board can be corroded layer by layer for 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 embossing 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, which saves the process of entering the corrosion machine for corrosion. Especially, 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-adhesive, glue-spraying, exposure, and corrosion. Save labor and time. After rolling by the hot rolling mill and tempering, the thickness is uniform, the thickness tolerance is very small, and there is basically no anisotropy, which eliminates the internal stress of the plate. In addition, the yield strength of the etched magnesium plate is more than 200MPa, which is stronger than the rigidity. Therefore, no matter in the process of hot stamping and embossing after gluing the plate, or holding it for a period of time after the plate is lifted, it will not produce Deformation phenomena such as raised edges, bulging in the middle, and distortion of the layout.

　　In the production industry of New Year pictures, couplets, blessing characters, 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. Because it has the obvious advantages of fast heat transfer, no deformation and high printing durability, it is being used more and more.

In Disu, leather embossing, high-frequency molds, heat transfer printing, 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. It has advantages in transportation, installation and sticking, storage, etc., due to its small quality and light weight.

Magnesium has a small heat capacity ratio and rapid heating and cooling speeds. In the actual bronzing process, it can quickly transfer heat through conduction within a limited time, making the bronzing effect better and brighter; in addition, After a hot stamping is completed, its heat 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 is heated, the heat dissipation is slow, and the volume expansion is relatively large. Large, softened edges, this is a significant advantage of magnesium plates compared to copper plates.

　　The Brinell hardness value 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 plates is twice that of zinc plates, and is significantly higher than that of brass plates. If it is corroded magnesium board made of AZ80, its surface Brinell hardness value reaches 140.

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

　　In the magnesium plate corrosion machine, due to the fierce and fast reaction with nitric acid, a large amount 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 because it generates heat when it 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.

　　 After being corroded by nitric acid, a dense and continuous oxide layer can be formed on its 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 the 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.