Skip to main content

Extruded Aluminum Process Step Influences Colouring Effect


The influence of extrusion process on oxidation coloring is mainly the influence of mold/die design, extrusion temperature, extrusion speed and cooling method on the surface state and tissue uniformity of extruded profiles. Mold design should be able to make the material fully fit, otherwise, it is easy to appear bright (dark) with defects, the same profile may appear on the color separation; At the same time, the mold/die state and profile surface extrusion pattern also affect the oxidation coloring. Extrusion temperature, speed, cooling and cooling time are different so that the profile is not uniform but also produce color.

Anodic oxidation has important influence on electrolytic coloring of chromatic aberration, especially in the process of vertical oxidation production line is easy to appear the two color, vertical oxidation groove depth of 7.5 m, bath and easy to produce temperature difference, temperature has important effect on the anodic oxidation, high temperature, liquid oxidation tank to increase the dissolution of oxide film, more groove on the surface of the anode oxidation membrane aperture increases, on the contrary, many grooves on the surface of the anode oxidation membrane pore size is smaller.In addition, the temperature is high, the porosity of anodic oxidation film is higher, and vice versa.Electrolytic coloring is mainly make coloring liquid metal ions in the oxide film on the surface of the microhole blocking layer electrochemical reduction reaction, make the colored liquid deposition of metal ions on the bottom of the anodic oxidation film hole of incident light scattering and show different color, deposition of microporous material, the more, the deeper the color.


In through the same power and under the condition of high temperature and low on the part of deposit the same amount of metal or metal compounds, for large aperture porosity and high surface area, average poreless sediment, so its relatively shallow color and color is deeper, thus caused the color shading material at both ends.In the process of anodic oxidation, conductivity of oxide film, can also cause color material to produce off color, the problem is mainly in the horizontal line is easy to appear, is mainly due to the oxidation on the blank in front of the oxidation process, the clamp is not tight, lead to bad individual conductive material, making it relatively different oxide film, after staining can produce off color.


Electrolytic coloring process can be directly reflected color difference problem, the current distribution of electrolytic coloring liquid ability has a decisive influence on coloring material evenly, once the current distribution, it could cause clear off color.The current distribution capacity of the tank is mainly related to the conductivity and polarization degree of the tank. The tinted liquid containing conductive salt, mainly in order to improve the electrical conductivity of coloring liquid, when conducting salt adding not timely, conductive ability to drop, loss of current distribution, it could cause off color.In addition of coloring liquid additives can produce characteristic adsorption, so as to increase the degree of polarization, which consumes too much, can make the polarizability of the electrolyte is reduced, the loss of current distribution can also cause color difference.In actual production, not only to improve the conductivity of the bath fluid, but also to guarantee the conductive rod, the copper seat has good conductivity, and the conductive bad can cause the distribution of power lines to be uneven, resulting in the color difference.

Hoonly Website:
Labels:

Comments

Post a Comment

Popular posts from this blog

4 Advantages of T-slotted Aluminium Extrusion Frame

Whether you are assembling a large production line, installing automation equipment, or setting up a workbench for a production line, you may need a metal framework to install robotic parts, dispensers, or other automated assembly equipment. Many factory owners choose traditional welded steel structures to enhance their strength and durability. However, aluminum extrusion frames are becoming increasingly popular for several reasons. Hoonly Aluminium Extrusion Framework is a modular solution that consists of  Aluminium extrusion profiles  with a unique T-slot design, and series of  specialized connectors & fasteners , which allows designer or purchaser to adjust the structure frame according to their own needs. Because the framework is aluminum, it often has a higher price tag than steel (actually less than stainless steel). But don't you found that aluminum extrusion frames offer distinct advantages over other material frames (such as wood, stainless steel) systems? 1,
Post a Comment
Read more

Application of High Strength Aluminum in Automotive Industry

The huge growing world car ownership is great influencing people's work and life, but resulting a series of problems such as energy shortage, environmental pollution is also increasingly prominent. Light-weight, energy saving, environmental protection, safety, comfort and low cost become the target of each car manufacturer, especially in energy saving and environmental protection, which is the major problem for the sustainable development of the human relationship, energy conservation, and emissions reduction has become an urgent problem in the automotive industry. Light-weight of the automobile,  which means on the premise of guarantee vehicle performance is not affected, auto-manufacturers should be targeted to reduce automobile weight, to ensure the safety and comfort, and meanwhile should not improve the cost. From the life cycle of the automobile products, a fuel consumption cost is the main part of the vehicle life cycle cost, which occupies 71% of the cycle costs. A
Post a Comment
Read more

Overview of Chemical Polishing Aluminium, Electra-chemical Polishing Aluminium and Mechanical Polishing

The general engineering application of wrought aluminium alloy material or building aluminium profile is the process of the semi-finished product. Aluminium extrusion profile manufacturers are generally able to directly put the profiles into anodize production line for anodizing. The obtained anodized film has the good protective properties in many engineering applications, which basically achieves uniform appearance requirements. However, if mechanically polished aluminium work-piece is directly anodized, only the smooth anodize oxide film could be obtained, but fails to get the coating film of high reflective. Chemical polishing and electro-chemical polishing can give aluminium profile a very shiny surface, but in terms of polishing, chemical polishing (or electro-chemical polishing) are fundamentally different from mechanical polishing: Chemical polishing and electrochemical polishing, as an advanced finishing method, can remove slight mold marks and scratches on the surface
15 comments
Read more