stainless steel sheet prices sheet aluminum for sale

The main element of zinc alloy with aluminum, copper and magnesium. Zinc alloy by deformation processing can be divided into two categories with cast zinc alloy. Cast zinc alloy fluidity and good corrosion resistance, suitable for die-casting instrumentation, automotive parts case Wait.First, the characteristics of the zinc alloy1. The relatively high specific gravity.2. casting performance, or complex die-cast shapes, thin wall precision castings, smooth surface.3. can be surface treatment: electroplating, painting, painting, polishing and grinding.The melting and do not smoke when iron-casting, pressure-type non-corrosive, non-stick mold.5. Have a good room temperature mechanical properties and wear resistance.6. The low melting point, melting at 385 ℃, easy casting.Use process issues to be aware of:1. poor corrosion resistance. When the alloy composition of impurity elements such as lead, cadmium, tin than the standard time, resulting in deformation of casting aging, expressed as a volume swell, mechanical properties, especially ductility decreased significantly, a long time or even rupture. Lead, tin, cadmium zinc alloys solubility is very small, and therefore focused on the grain boundaries become the cathode, aluminum-rich solid solution of an anode, in water vapor (electrolyte) presence of conditions to foster intergranular electrochemical corrosion. Casting due to intergranular corrosion and aging.2. Organization of aging effect of zinc alloy mainly containing Al and Cu, Zn-containing zinc-rich solid solution and Al-rich solid solution formed, their solubility decreases with temperature drop. However, due to the solidification casting speed is extremely fast, and therefore to room temperature, the solubility of solid solution is substantially saturated. After a certain time, this over-saturation phenomenon will gradually lifted, leaving the cast to shape and size slightly to change.3. zinc alloy die castings should not be used at high temperature and low temperature (0 ℃ or less) work environment. Zinc alloy at room temperature have good mechanical properties. But at a high temperature impact properties were significantly decreased under tensile strength and low temperatures.

Corrosion of metal plate production process

Corrosion of metal plate production processCorrode metal plate is also called etching plate. The main search using the mask, after etching process processing system to do three steps from the Braille metal plate or a concave metal plate.Corrosion of metal plate production process:1) Cutting: by drawing (layout size) in size, surrounded by more than plus not less than 5mm burrs. Shears with 720 foot-operated shears, the surface smooth, surrounded by non-Maori.2) metal corrosion signs Finish:(1) mechanical polishing: polishing machine with 2.2-4 kW of mechanical polishing wool, cloth round use motor speed is generally 300-350 2000-3000 revolution / min.(2) alkali treatment: 10-15% aqueous solution of sodium hydroxide at 65-85 ℃ in the metal plate cook 10-30 seconds, and then washed with water, immersed in 5% of the weight of Ming acid aqueous solution.(3) powder processing method: using a flat brush dipped in old powder (double pink) version of the child will be a uniform method of cross brush ears, except to effect until decontamination face, skin or remove oxygen, and then with a 5% aqueous solution of potassium dichromate In closed.