What are the common surface processing processes for industrial aluminum profiles?
In the Industrial automation assembly line, our common products are processed by industrial aluminum profiles, so what are the processing methods of these products?
Common industrial aluminum profiles are processed, generally spraying, electroplating, drawing, sand blasting, anode, passivation, oxidation film, polishing machine polishing and other appearance treatment process.
Surface treatment of industrial aluminum profiles 1, passivation is to make the appearance of metal into a state that is not easy to be oxidized, and to delay the corrosion rate of metal methods.
An active metal or alloy in which the chemical activity decreases greatly and becomes a representation of the state of precious metals, called passivation. 2, Anodic oxidation: That is, the use of electrolysis principle on the appearance of some metal coated with a thin layer of other metal or alloy process. Brush plating is suitable for local plating or correction. Rolling plating is used in small pieces, such as fasteners, gaskets, pins and so on. Electroplating, can be in the finished machinery to obtain decoration protection and a variety of functional appearance layer, but also to correct wear and processing errors of the workpiece.
Electroplating solution has acidic, alkaline and chromium mixture of acidic and neutral solution, regardless of the choice of coating method, and the finished product and plating solution Touch of the plating groove, suspension, etc. should have a certain degree of versatility. 3, spraying: for the external protection of equipment, decoration, usually on the basis of oxidation.
Aluminium profiles should be pre-treated before coating to make the coating and workpiece strong, usually in three ways: (1). Phosphating (phosphate method), (2). Chromium (chrome-free chromium), (3). Chemical oxidation.
4, sandblasting, the first effect is the appearance of finishing, in the coating (spray paint or spray) before sandblasting can add appearance roughness, adhesion progress has been dedicated, but the dedication is limited, not as chemical coating before treatment.
5, chemical oxidation: The oxide film is thinner, the thickness of about 0.5~4 micron, and porous, soft, with outstanding adsorption, can be used as the bottom layer of organic coating, but its wear resistance and anti-corrosion function are not as good as anodic oxide film. 6, aluminum and aluminum alloy chemical oxidation technology according to its solution properties can be divided into alkaline oxidation method and acidic oxidation method two categories. According to the properties of the membrane can be divided into: oxide film, phosphate film, chromate membrane, chromate-phosphate film.
Conductive oxidation (chromate conversion film)-for both protection and conductive applications. 7. Coloring: Coloring Aluminum There are two primary techniques: one is aluminum oxidation coloring technology, the other is aluminum electrophoresis coloring technology.
In the oxide film to form a variety of colors, to satisfactory use of the request, such as optical instrument parts are commonly used in black, commemorative medals on the gold and so on. 8, chemical polishing is the use of aluminum and aluminum alloy manufacturing in acidic or alkaline electrolyte solution of the selective self-dissolution effect, to leveling polishing the appearance of the year, in order to reduce its appearance roughness, PH of the chemical processing methods. This polishing method has the advantages of simple equipment, no power supply, no external size constraints, high throwing speed and low processing cost.
The purity of aluminum and aluminum alloy has a great influence on the quality of chemical polishing, the higher the purity, the better the polishing quality, the worse the reverse. 9, electrochemical oxidation, aluminum and aluminum alloy chemical oxidation treatment equipment abbreviated, easy to operate, high production efficiency, no power consumption, a wide range of application, not subject to the size of the parts and shape constraints. Oxide film thickness of about 5~20 micron (hard anodic oxide film thickness up to 60~200 micron), has a high hardness, outstanding heat and insulation, anti-corrosion can be higher than chemical oxide film, porous, has excellent adsorption ability.