Thermal spraying manufacturers introduce thermal spraying technology and characteristics

       The temperature of the anodizing solution is the dominant process parameter that affects the properties of the oxide film. When the temperature increases, the viscosity of the solution decreases, the current density increases (when the voltage is constant), or when the voltage decreases and the current is constant, the power consumption can be reduced at this time, and the production efficiency can be improved.

When the solution temperature exceeds the process specification, the dissolution rate of the film layer increases, resulting in a decrease in the formation rate of the film, the hardness of the film layer and the thickness of the film layer, the deterioration of the wear resistance and corrosion resistance, and the loose oxide film, and a powdery film may also appear. layer, followed by a decrease in the transparency of the film layer. And affect the dyeing performance, resulting in the dyed color is not clear enough, or even foggy. This is especially important for workpieces to be dyed, and everything possible should be done to reduce the temperature of the solution.

When the solution temperature is too low, although the thickness of the oxide film can be increased and the wear resistance is good, the brittleness of the film layer increases and the porosity is small, which makes it difficult to dye the dyed parts. For this reason, when aluminum and aluminum alloys are anodized, the solution temperature must be strictly controlled to prevent the solution temperature from being too low.

Anodizing is an exothermic reaction, the heat of formation of the membrane is very high, and Joule heat is generated, and the temperature of the solution rises rapidly. For this reason, according to the existing conditions, corresponding measures should be taken to control the temperature of the solution in the normal process. within the specifications to ensure the quality of the film and the continuation of production. When the solution temperature is too low, it is not conducive to the requirement of dyeing after anodization. At this time, the general parts can be processed first, and then the dyed parts can be processed when the solution temperature rises slightly, which must be mastered by experience.

What is the relationship between the anodizing time and the quality of the oxide film?

Under the same solution concentration and other process conditions, with the prolongation of anodizing time, the oxide film formed on the surface of the workpiece will gradually thicken, and the pores will also increase, which is favorable for dyeing.

Under the same process conditions as above, thermal spraying manufacturers shorten the anodizing time, the oxide film will become thinner, the pores will become less, and it is not easy to dye dark colors. For this reason, except for some special cases, for example, in order to maintain a certain brightness of electrochemically polished parts after anodization, the anodization time is shortened, the anodization time of general parts should not be less than 30min, it needs to be properly extended for dark-colored parts, especially when the solution temperature is low, sometimes it needs to be extended to 45-60min.

Is agitation of the solution necessary during anodizing?

It is very necessary to use compressed air to stir the solution during anodization, because the heat generated during anodization, such as the solution accumulated on the surface of the oxide film, will lead to accelerated dissolution of the oxide film, thereby reducing the overall performance of the part. Plasma spraying uses compressed air to stir the solution, so that the heat generated by the part can be quickly dissipated, and the cooled solution can cool the surface of the part, so that the solution circulates continuously on the surface of the part. Therefore, the normal operation of the oxidation process is ensured, and the uniformity of the thickness of the o