Causes of floating ash in aluminum dyeing
What we are exploring is the useanodic oxidation of organic dyesWhen dyeing, floating ash appears. Because many manufacturers are now using more environmentally friendly organic dyes to color aluminum, and floating ash is a problem that often occurs when dyeing aluminum surfaces. Let's take a look at it.
Anodic oxidation dyeing is the most important anodic oxide film, only a good oxide film can get high quality dyeing products. The second is anodic oxidation dyes, and now many are organic dyes, the pros and cons of dyes also directly affect the quality of dyeing, such as UV resistance, whether to fade and so on. It is recommended to use some well-known brands of dyes, such as those of Japan's Ono and Switzerland's Colijn.anodic oxidation of organic dyesIts color is rich, and its quality has been verified by the market for many years. In the process of coloring with organic dyes, floating ash appears, and the situation is probably the following two.
High temperature of dyeing solution
to useanodic oxidation of organic dyesDye black for example. When the temperature of the dyeing solution is too high, the coloring speed is accelerated. As a result, the acid orange II component with smaller molecules in the acid green "gets ahead" and causes the acid blue black IOB, another component in the acid green, to be "squeezed out", thus producing floating ash. The dyed layer thus obtained also appears reddish, so that the temperature of the dyeing solution is controlled within the standard range.
High temperature of anodizing solution
In addition to the useanodic oxidation of organic dyesFloating ash during dyeing. When the temperature of the anodizing solution is too high, the dissolution rate of the oxide film is accelerated, and the resulting oxide film is dissolved to produce a powdery substance, that is, "floating ash".
In order to avoid the aggravation of floating ash in high temperature season, the temperature of anodizing solution is maintained within the normal process specification to ensure the product quality. The author proposes the following solutions:
① Adjust the work shift. Change the daytime shift to the night shift. Generally, the temperature at night is 5~10 ℃ lower than that during the day.
② Multi-slot rotation work. After one or more times of anodization, due to the Joule effect, the solution temperature rises, when more than the temperature allowed by the process should stop working, let the natural cooling, the next slot of the workpiece in another anodization tank, so that the rotation operation does not affect the production, and can avoid the influence of high temperature solution on the anodized film.
③ Replace the large volume tank. Increase the volume of the anode tank, for the processing of the same surface area of the workpiece, the solution temperature will be correspondingly slow.
④ Reduce the primary loading capacity. When the loading capacity in the tank is reduced, the Joule heat generated at the anode is also reduced accordingly, which can reduce the heating rate of the solution.
Dyeing, dye, solution, oxidation, temperature, anode, floating ash, organic, use
