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Anodic oxidation process conditions and the quality of the oxide film is closely related to, because the process conditions are based on different process recipe, after a series of experiments derived, before anodizing, the process conditions specified should be done A few, the operation should be strictly in accordance with the requirements of the process to do. Among them, the most basic factors affecting the quality are the control range of solution temperature, voltage and current density, anodization time, solution stirring method, the volume current density of bath, the ratio of bath volume to anodized area, etc. . Any deviations in the execution of these process conditions can significantly affect the quality of the anodized film. When the deviation is too large, it may also cause scrapings and economic losses.Stainless steel die casting CNC turning part Supplier
Affect the quality of anodized film several major factors
① current density: within a certain limit, the current density increases, the membrane growth rate increases, the oxidation time is shortened to generate more pores in the membrane, easy to color, and hardness and wear resistance increased; current density is too high, Joule heat, the parts surface overheating and local solution temperature increases, the dissolution rate of the film increases, and the possibility of burning parts; current density is too low, the film growth rate is slow, but the resulting film is more dense, hardness and Reduced wear resistance.
Aluminum oxidation, for protection, decoration and pure decoration processing, the use of the maximum allowable concentration, that is, 20% sulfuric acid as electrolyte.
② oxidation time: the choice of oxidation time, depending on the electrolyte concentration, temperature, anode current density and the required thickness. Under the same conditions, when the current density is constant, the growth rate of the film is proportional to the oxidation time; however, when the film grows to a certain thickness, the film resistance increases due to the increase of the film resistance, and due to temperature rise, the dissolution rate of the film increases , So the growth rate of the membrane will gradually reduce, to the last no longer increase.Aluminum anodize CNC turning product Supplier
③ sulfuric acid concentration: usually 15% to 20%. The higher the concentration, the higher the dissolution rate of the membrane, the lower the growth rate of the membrane, the higher the porosity of the membrane, the stronger the adsorption, the more flexible and the better the dyeability (easy to dye dark) Reduce the concentration of sulfuric acid, the oxide film growth rate, film porosity, high hardness, good wear resistance.
④ electrolyte temperature: the temperature of the electrolyte film quality greatly affected. The temperature increases, the dissolution rate of the film increases, the film thickness decreases. When the temperature is 22 ~ 30 ℃, the resulting film is soft, good adsorption capacity, but wear resistance is quite poor; when the temperature is greater than 30 ℃, the film becomes loose and uneven, and sometimes even discontinuous, and The hardness is low, thus losing the use of value; when the temperature is between 10 ~ 20 ℃, the oxide film generated by the porous, strong adsorption capacity and flexibility, suitable for dyeing, but the film hardness is low, wear resistance is poor; when the temperature is low At 10 ℃, the thickness of the oxide film increases, the hardness is high, the wear resistance is good, but the porosity is low. Aluminum anodize CNC milling product Supplier Therefore, the production must be strictly controlled electrolyte temperature. To make a thick, hard oxide film, the operating temperature must be lowered, with compressed air agitation and relatively low temperatures during the oxidation process, usually with hard oxidation at around zero.
⑤ stirring and moving: electrolyte convection can be promoted to strengthen the cooling effect, to ensure the uniformity of the solution temperature, will not result in local metal heating caused by the decline in the quality of the oxide film.