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Reasons why Precision Aluminum Die Casting parts cannot be Anodized

Sep. 23, 2019

Aluminum Alloy Die Cast Part Factory does not claim anodizing and plating of aluminum alloys. Precision Aluminum Die Casting parts are simple in appearances, such as angry lines, cold partitions, sand holes, and other shortcomings. Generally, the anode is changed to the material of aluminum extrusion type, and the plating is changed to zinc-aluminum alloy or zinc alloy. The so-called anodic oxidation of aluminum is an electrolytic oxidation process in which the appearance of aluminum and aluminum alloys is usually converted into an oxide film, which has maintenance, decoration and some other functional properties. The anodization of aluminum from this definition includes only the part of the process of forming an anodized film.

Precision Aluminum Die Casting parts

Precision Aluminum Die Casting parts

Die casting plating treatment

The metal or alloy article is used as an anode, and the outer surface thereof is made into an oxide film by electrolysis. The metal oxide film changes the appearance and function of the surface, such as appearance coloring, improving corrosion resistance, enhancing wear resistance and hardness, and maintaining metal appearance. For example, aluminum anodizing, aluminum and its alloys are placed in the corresponding electrolyte (such as sulfuric acid, chromic acid, oxalic acid, etc.) as an anode, and electrolysis is carried out under specific conditions and an applied current effect. The aluminum of the anode or its alloy is oxidized to form a thin layer of aluminum oxide having a thickness of 5 to 30 μm and a hard-anodized film of 25 to 150 μm. The anodized aluminum or its alloy improves its hardness and wear resistance up to 250-500 kg/mm 2, excellent heat resistance, and the hardness of the hard-anodized film is as high as 2320 K. Excellent insulation and resistance to attack The wearing voltage is up to 2000V, which enhances the anti-corrosion function and does not corrode in the salt fog of ω=0.03NaCl for several thousand hours. The oxide film has a large number of micropores in the thin layer, which can adsorb various lubricants, and is suitable for making engine cylinders or other wear-resistant parts; the membrane microporous adsorption ability can be colored into various beautiful and beautiful colors. Non-ferrous metals or alloys thereof (such as aluminum, magnesium and their alloys) can be anodized. This method is widely used in mechanical parts, aircraft parts, precision instruments and radio equipment, daily necessities, and construction.

The anodization of aluminum alloys in existing processes remains a challenge. For electroplating, some manufacturers can do it. Generally, a layer of zinc is first plated, then a copper plate is plated, and then electroplated. The cost is too high and the yield is low.

A general term for aluminum-based alloys. The primary alloying elements are copper, silicon, magnesium, zinc, manganese, and the non-essential alloying elements are nickel, iron, titanium, chromium, lithium, and the like. Aluminum alloy is one of the most widely used non-ferrous metal structural materials in the industry and has been used extensively in the aerospace, aerospace, automotive, mechanical, marine and chemical industries.

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