[ALUMINIUM NETWORK] The pre-treatment process for electroplating on aluminum or aluminum alloys is based on a synthesis of the literature: (1) After chemical etching or mechanical polishing, the oxide on the surface of the plating part is removed and directly plated; (2) Electroplating after zinc plating ;3 Electroplating after anodization. Currently widely used is zinc immersed and anodized two processes.
Because the aluminum alloy bush is a bimetallic layer structure, the electroplating pretreatment process must ensure the binding force of the coating, and it should also ensure that the steel back after precision machining does not cause excessive corrosion, so the pretreatment process and the purity of the aluminum alloy bearing bush plating The pretreatment process of aluminum alloy plating is quite different.
Researchers at the Department of Chemistry at Jiaying College conducted various tests to obtain pre-plating processes on the surfaces of aluminum-zinc alloy bearings. The results show that a nickel layer with good binding force can be obtained by using ammonium persulfate solution instead of the black film on the surface of the mixed acid bush, anodizing the aluminum-zinc alloy with the sulfamic acid electrolyte, and anodizing and then electroless nickel plating.
A pickling process using ammonium persulfate solution can not only remove the black film produced by alkali corrosion of Al-Zn alloy, but also greatly reduce the corrosion rate of steel back.
2 Using sulfamic acid as electrolyte to anodize aluminum-zinc alloy, with the characteristics of short film forming time and light corrosion to steel back.
3Aluminum-zinc alloy Anodized with sulfamic acid and electrolessly plated with nickel to obtain a nickel coating with good adhesion.
4 Aluminium-zinc alloy bush plating Pb-Sn-Cu ternary alloy pretreatment process flow is: degreasing → washing → alkali corrosion → washing → pickling (ammonium persulfate solution except black film) → washing → anodizing (aminosulfonyl) Acid oxidation) → washing → electroless nickel plating.
Aluminium Sliding Window
Aluminum single -hanging window is a window type made of aluminum alloy material. The following are some introductions about it:
1. Structural characteristics:
-Forest frame: Made of aluminum alloy material, has high strength and stability, and can withstand greater weight and wind. The design of the window frame is usually relatively concise to achieve narrow -edge effects and maximize the lighting area and field of vision.
-Fan fan: Generally, there is only one fan fan. It can be connected to the window frame through the hinge or other connection devices to open out or inward. The size of a single -hanging window is relatively small to facilitate operation and control.
-The hardware accessories: including clubs, handles, locks, etc. The quality of these hardware accessories directly affects the performance and safety of the window. High -quality hardware accessories can ensure that the windows are opened and closed smoothly, and they have good anti -theft function.
2. Performance advantages:
-Beve sealing: Aluminum single -hanging windows usually use sealing materials or sealing wool strips such as sealing materials, which can effectively prevent the penetration of air, rain and dust, and improve the indoor insulation, heat insulation and sound insulation effects.
-Opered corrosion resistance: The material of aluminum alloy has good corrosion resistance, not easy to rust and corrosion, and can be used for a long time in various harsh environments. Even in high corrosive environments such as humidity, rain, or coastal areas, aluminum single -hanging windows can maintain good appearance and performance.
-The higher strength and hardness: The strength and hardness of aluminum alloy materials are high, and can withstand large external force impacts, and it is not easy to deform and damage. This makes aluminum single -hanging windows have good safety and stability, and can effectively protect the safety of indoor personnel and property.
3. Application scenario:
-Residential building: suitable for various residential buildings, such as villas, apartments, ordinary houses, etc. It can be installed in different rooms such as bedrooms, living rooms, kitchens, and bathrooms to meet different lighting and ventilation needs.
-A commercial buildings: There are also widely used applications in commercial buildings, such as office buildings, shopping malls, hotels, etc. It can be used as an outer wall window or indoor partition window to provide good lighting and vision for business space.
-Ex Industrial Building: In some industrial buildings, such as factory buildings, warehouses, etc., aluminum single -hanging windows can also be used as a window for ventilation and lighting. Because it has good corrosion resistance and strength, it can meet the requirements of the industrial environment.
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