1. Casting
Melting and casting is the first process of aluminum production, the main process is:
① Batching: according to the need to produce specific alloy grades, calculate the amount of various alloy components added, reasonable with a variety of raw materials.
② Smelting: the raw materials will be good according to the process requirements into the melting furnace melting, and through the removal of gas, dross removal refining means of the melt within the slag, gas effectively removed.
③ Casting: the molten aluminum liquid is cooled and cast into various specifications of round casting rods through the deep well casting system under certain casting process conditions.
2. Extrusion
Extrusion is the means of profile molding. First according to the profile product cross-section design, manufacturing out of the mold, the use of extruder will be heated round cast bar from the mold extrusion molding. Commonly used grade 6063 alloy, in the extrusion also use an air-cooled quenching process and its subsequent artificial aging process, in order to complete the heat treatment strengthening. Different grades of heat treatable reinforced alloys have different heat treatment regimes.
3. Coloring (here first mainly talk about the process of oxidation)
Oxidation: extruded aluminum alloy profiles, its surface corrosion resistance is not strong, must be anodic oxidation surface treatment to increase the corrosion resistance of aluminum, abrasion resistance and the appearance of the aesthetic degree.
The main process is:
① Surface pretreatment: the andoic oxidation of the porous oxide film generated after the closure of the membrane pore pores, so that the oxide film anti-pollution, corrosion and abrasion resistance to enhance performance. The oxide film is colorless and transparent, using the strong adsorption of the oxide film before sealing the pores, some metal salts are adsorbed and deposited in the pores of the film, which can make the appearance of the profile appear in many colors other than the original color (silver-white), such as: black, bronze, gold and stainless steel color, and so on.
② Anodic oxidation: after the surface pretreatment of the profile, under certain process conditions, the surface of the substrate is anodized to produce a layer of dense, porous, strong adsorption of AI2O3 film layer.
③ Seal the hole: chemical or physical methods of cleaning the surface of the profile, bare pure substrate, in order to facilitate the acquisition of a complete, dense artificial oxide film. It is also possible to obtain a mirror or non-glossy (matte) surface by mechanical means.
4. Characteristics and performance of aluminum profiles after various surface treatment processes:
① Brushed fabric aluminum profile: this profile is the most advanced treatment technology in the world today. The quality of this profile is excellent, but the cost is higher. It has more than 20 kinds of color tones, and its biggest feature is that it can be color-coated like printing cloth according to the needs, and the surface of the profile is colorful with excellent decorative effect.
② Multi-color surface treatment of aluminum profiles: powder electrostatic spraying profiles are characterized by excellent corrosion resistance, acid and alkali salt spray resistance is greatly superior to the oxidation coloring profiles.
③ Electrophoretic painted aluminum profiles: electrophoretic painted profiles have a soft surface luster and can resist the erosion of cement and mortar acid rain, 90% of the aluminum profiles in Japan are electrophoretically painted.
Powder electrostatic spraying aluminum profiles: monotonous silver and teal can no longer satisfy the architects with the exterior decorative tiles, wall latex with a good match, the new stainless steel color, champagne color, golden yellow, titanium gold, red series (burgundy, red, black, purple), etc. coupled with stained glass can make the decorative effect of the icing on the cake. These profiles must be chemically or mechanically polished and then oxidized, the effect is good.
⑤ Plasma-enhanced electrochemical surface ceramization aluminum profiles: frosted surface aluminum profiles to avoid the bright aluminum alloy profiles in the architectural decoration of the existence of certain environments, under certain conditions will form the shortcomings of the interference of the light, the surface of which is as delicate and soft as the satin, is very much favored by the market, but the existing frosted material must be to overcome the surface grit is not uniform, and can be seen in the molded pattern of the shortcomings.
5. Titanium plating process
The titanium gold plating process for aluminum profiles includes the steps of material selection, polishing, chemical degreasing, water rinsing, activation, and vacuum titanium plating process, characterized in that it also includes:
a. Pre-plating process: the process is to place the titanium-gold plated aluminum profiles, which are activated and rinsed with clean water, in a liquid consisting of table salt, hydrochloric acid and water for chemical treatment at room temperature and for a period of time until the liquid undergoes an intense chemical reaction;
b. Electroplating process: the composition of the plating solution in this process includes nickel sulfare, nickel chloride, boric acid, sodium dodecyl sulfate, saccharin, brightener, process conditions: current 3-4A /dm cathode movement, 5-7A /dm air agitation, plating temperature 50-60℃, PH value of 3.9-4.2, electroplating time of 15 minutes.
