Corrosion resistance
The density of aluminum profile is only 2.7g/cm³, about 1/3 of the density of steel, copper or brass (7.83/cm³, 8.93/cm³, respectively.) Under most environmental conditions, including in air, water (or salt water), petrochemistry, and many chemical systems, aluminum can show excellent corrosion resistance.
Electrial conductivity
Aluminum profiles are often chosen for their excellent electrial conductivity. Aluminum has nearly twice the electrial conductivity of copper on the basis of equal weight.
Thermal conductivity
The thermal conductivity of aluminum alloys is about 50-60% of that of copper, which is advantageous for the manufacture of heat exchangers, evaporators, heating appliances, cooking utensils, and cylinder heads and radiators for automobiles.
Non-ferromagnetic
Aluminum profiles are non-ferromagnetic, an important characteristic for the electrial and electronics industries. Aluminum profiles are non-spontaneously combustible, which is important for applications involving handling or contact with flammable and explosive materials.
Machinability
The machinability of aluminum profiles is excellent. In the various deformed and cast aluminum alloys, and in the various states in which these alloys are produced, the machinability characteristics vary considerably, requiring special machine tools or techniques.
Formability
Specific tensile strength, yield strength, ductility and corresponding work-hardening rates govern the amount of allowable deformation. According to a survey conducted by Foresight.com's "China Aluminum Profile Industry Market Demand Forecast and Investment Strategy Planning Analysis Report Foresight", commercially available ratings for formability of aluminum profiles in different forms depend on the process method used for forming.
Recyclability
Aluminum is highly recyclable, and the properties of recycled aluminum are virtually indistinguishable from those of virgin aluminum.
Production Process
Casting
Melting and casting is the first process in the production of aluminum.
The main process is:
(1) batching: according to the specific alloy grade to be produced, calculate the addition amount of various alloy components, and reasonably match various raw materials.
(2) melting: the raw materials will be matched according to the process requirements into the melting furnace melting, and through the removal of gas, slag 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.
Extrusion
Extrusion is a means of forming profiles. 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 forming. 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.
Coloring (here first mainly talk about the process of oxidation)
Oxidation: Extruded aluminum alloy profiles, the surface corrosion resistance is not strong, must be anodic oxidation surface treatment to increase the corrosion resistance of aluminum, wear resistance and the appearance of the aesthetic degree.
The main process is as follows:
(1) surface pretreatment:chemical or physical methods of cleaning the surface of the profile, exposing the pure matrix, in order to facilitate the acquisition of a complete, dense artificial oxide film. Can also be obtained by mechanical means mirror or no light (matte) surface.
(2) anodic oxidation: after the surface pretreatment of the profile, under certain process conditions, the substrate surface anodic oxidation occurs, generating a layer of dense, porous, strong adsorption of AL203 film layer.
(3) sealing hole: the porous oxide film generated after anodic oxidation of the membrane pore pores closed, 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 holes, adsorption and deposition of some metal salts in the membrane holes, which can make the appearance of the profile to show many colors other than the original color (silver-white), e.g.: black, bronze, gold and stainless steel color.
Characteristics and performance of aluminum profiles after various surface treatment processes
Frosted fabric aluminum profiles: frosted surface aluminum profiles to avoid the bright aluminum alloy profiles in the architectural decoration of the existence of certain environments, conditions that will form the shortcomings of light interference, its surface as delicate and soft as brocade, very popular in the market, but the existing frosted material must overcome the surface grit is not uniform, and can be seen in the molded pattern of the shortcomings.
Multi-tone surface treatment of aluminum profiles: the current monotonous silver-white and teal can no longer meet the architects and exterior decorative tiles, exterior latex with a good match, the new stainless steel color, champagne color, golden yellow, titanium gold, red series (burgundy, date red, black, purple), etc., plus stained glass to 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.
Electrophoretically painted aluminum profiles: electrophoretically 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: powder electrostatic spraying profiles are characterized by excellent corrosion resistance, acid and alkali salt spray resistance is greatly superior to the oxidation coloring profiles.
Plasma-enhanced electrochemical surface ceramization of aluminum profiles: This type of profile is the most advanced treatment technology in the world today. The quality of this profile is excellent, but the cost is high. It has more than 20 kinds of shades, and its biggest feature is that it can be color-coated like calico according to the needs, and the surface of the profile is colorful with excellent decorative effect.
Titanium plating process
Aluminum profile titanium plating process, belongs to the coating technology, it is based on the conventional titanium plating process to increase the pre-plating and plating process steps, pre-pre-plating process is the activation of the plated parts are placed in aqueous salt and hydrochloric acid for chemical treatment; plating process of the plating solution components include nickel sulfate, nickel chloride, boric acid, sodium dodecyl sulfate, saccharin, brightener, the process has a simple, practical and effective, etc., the advantages of the technology This process has the advantages of simplicity, practicability and good effect. The titanium aluminum profile produced by this process has a film hardness of HV≈1500, which is 150 times more wear-resistant than 22K gold plating under the same conditions, and it can be processed into a variety of forms of gold, color, black and other bright series of aluminum profile products.
Aluminum profile titanium gold plating process, including the steps of material selection, polishing, chemical degreasing, clear water rinsing, activation, vacuum titanium plating process, characterized in that it also includes:
a, pre-plating process, the process is activated and rinsed by water rinsing titanium gold aluminum profiles placed in the liquid consisting of salt, hydrochloric acid and water for chemical treatment, the treatment temperature is room temperature, the treatment time until the liquid undergoes an intense chemical reaction;
b, plating process, the process of plating solution composition including nickel sulfate, 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, plating time 15 minutes.
