Aluminum anodic oxidation process operation requirements

by:AAG     2020-11-08

with the vigorous development of the aluminum processing industry, aluminum surface treatment has become the indispensable important processing production. Aluminum after surface treatment, wear resistance, corrosion resistance, light resistance, weather resistance and other properties are greatly improved, more important is can with a variety of beautiful bright colors. Because other decoration of various buildings, with aluminum products, arts and crafts, decoration, furniture appliances such as beautiful and easy, to meet the needs of era of aesthetic feeling, thus the application value of aluminum was too high. For decoration and improve the performance of aluminum surface coloring treatment on the aluminum oxide film, the commonly used method of electrolytic coloring method, chemical coloring method, natural coloring method, etc. In practical production such as personnel, technology, equipment and operation is different, each batch of product color will be different, different quality defects, under the particular medium, color depth is determined by metal particle deposition quantity, and has nothing to do with the thickness of the oxide film. The production of aluminum electrolytic coloring colour difference, and coloring mechanism, the uniformity of the thickness of the oxide film and a direct relationship between the structure and the speed of electrolytic coloring. The defects of aluminum color generally has the following several ways: dye color light, color, no color, white, thief, dyeing hair flower, such as color of escape. How to solve this problem, ensure that every batch of products consistent color, and within the scope of the both parties confirm the deviation, to meet the demand of the consumers. This requires production enterprise, at the time of electrolytic coloring of profile surface treatment, research and prevention. The common quality defects in the anodic oxidation process and a processing method, color uniform stability and control the color difference in a certain range, reduce the shading defects, in the actual production process, first of all, to strengthen the anode oxidation process operation control, at the request of the operation is pay attention to the following several aspects. 1, in the anodic oxidation of profile into the coloring trough must maintain larger inclination, and placed in the middle of the poles, to ensure that the pole pitch about equal, at the same time control on the tie material area, each hanging maximum total surface area of no more than 44 ㎡. 2, check the slot liquid concentration, whether to conform to the requirements of the process. 3, sending coloring, crane hook pegged to the conductive beam must be off, and let stand for 0. 5 ~ 1 minute before sending color. 4, the same color coloring voltage must be equal, adjust the power supply voltage in advance before coloring. At the end of the 5, coloring, must immediately lifting, bath flow as soon as possible, as soon as possible transfer to sink water wash, do not stay in the coloring trough, strict control of air lifting time, fully wash the profiles of the inner hole after acid, can color board color, the color, master the material color is slightly deeper than the sample color. When color too shallow, again into the coloring trough electricity complementary color, when the color is too deep, back into the coloring trough ( No electricity) Fade or oxidation groove at the back of the acid tank. 6, because gold cannot fade, setting the coloring time shoulds not be too long. 7, after color profile should be after water wash secondary fully exert acid electrophoresis or hole sealing process can proceed. 8, strengthening rinse before dyeing, workpiece by should be completely flushed after anodic oxidation groove, especially the slit of artifacts, the place such as blind hole, otherwise the remnants of acid and alkali in dyeing process will be slow, the dyeing solution pH value deviates from the normal range, and make the color on the surface of the residual alkali parts and clean parts have obvious difference, even corrosion oxide film and shows white. 9, after anodic oxidation dyeing, workpiece immediately after anodic oxidation dyeing. If the workpiece after anodic oxidation in air exposure time is too long membrane pore will narrow, and is likely to touch on dirt, which causes the difficulty in dyeing. Because if the dyeing tank is too small, needs the batch dyeing, we should treat dyeing the thing soak in clean water. 10 artifacts do not overlap, dyeing, dyeing artifacts we don't overlap, especially the flat parts, otherwise due to the overlapping parts covered form surface of Yin and Yang. 11, strengthen the flushing after dyeing, if the workpiece surface is rinsed clean, not leave residual pigment will pollution of the assembly.
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