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How to carry on the plating surface in aluminium and aluminium alloy profile?

by:AAG     2020-11-06


how to carry on the plating surface in aluminium and aluminium alloy profile? Aluminium and aluminium alloy profile after plating on the surface of the metal, can obviously improve the physical or chemical properties of the surface, with aluminium and aluminium alloy profiles do conductor, plating silver on the surface can improve the surface or the electric contact parts of the electrical conductivity; In order to make easy to weld aluminum, in its surface plating copper, nickel, or tin; In order to improve its wearability, plating thickness luo on the surface. In terms of decoration, actually mostly electroplating luo. Aluminium and aluminium alloy profile surface electroplating, long ago have to try and has been used in practical production. But between aluminium and aluminium alloy profiles and coating oxide, aluminium and aluminium alloy profiles with different thermal expansion coefficient of metal coating, coating with factors such as pinhole and remnants of plating solution, causing poor bonding strength, long time use will flake peeling off immediately after plating, even in the field of surface treatment, aluminium and aluminium alloy profiles of electroplating technology is still in the exploratory stage, no substantive breakthrough for quite a long time, has not been formed complete, mature technology. Coating binding force is not firm aluminium and aluminium alloy profiles of plating quality and product percent of pass is still the bottleneck of the industry. Conventional plating process of aluminium and aluminium alloy profile aluminium and aluminium alloy profiles plating process have treatment before plating, electroplating, plating post-processing of 3 parts. Plating pretreatment is relation to the plating product quality advantages and disadvantages of the key working procedure, its main purpose is to remove grease on the surface of the aluminium and aluminium alloy profiles, the natural formation of oxide film and other dirt. Conventional general technological process is: skim - Water - Reduce the corrosion - Water - Pickling - Water - Activation - Water - Leaching zinc - at a time Water - Zinc back - Water - Secondary - leaching zinc Water - Neutral nickel - plating Water - Subsequent electroplating. Also has use of anodic oxide film instead of zinc leaching process for subsequent electroplating. Modified universal aluminium and aluminium alloy profiles before plating processing craft skimmed alkali corrosion seal - Water - Pickling - Water - To ash - Water - The alkaline activation - Leaching zinc - Water - Neutral nickel - plating Water - Subsequent electroplating.
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