The process of titanium-gold plating on aluminum profiles belongs to the coating technology. It adds pre-plating and electroplating process steps on the basis of conventional titanium plating. Aluminum profiles are chemically treated by placing the activated plated parts in aqueous solutions of salt and hydrochloric acid.
The bath composition of electroplating process includes nickel sulfate, nickel chloride, boric acid, sodium dodecyl sulfate, saccharin and brightener. The process is provided with the advantages of simplicity, practicability, good effect and so on. The film hardness of Ti-Au-Al profiles prepared by this process is HV≈1500, and the wear resistance is 150 times higher than 22K gold plating under the same conditions. It can be processed into various kinds of bright series of aluminum profiles such as gold, color, black and so on.
The density of aluminum profile is only 2.7g/cm3, which is about 1/3 of steel, copper or brass (7.83g/cm3, 8.93g/cm3 respectively). Aluminum exhibits excellent corrosion resistance under most environmental conditions, including in air, water (or brine), Petroleum Chemistry and many chemical systems.
Aluminum profiles are often selected because of their excellent electrical conductivity. On the base of equal weight, the conductivity of aluminum is nearly twice of copper.
The thermal conductivity of aluminum alloy is about 50-60% of copper, which is beneficial to the manufacture of heat exchangers, evaporators, heating appliances, cooking utensils, as well as the cylinder head and radiator of automobiles.
Aluminum profiles are non-ferromagnetic, which is an important characteristic for the electrical and electronic industries. Aluminum profiles cannot spontaneously ignite, which is important for applications involving handling or contact with flammable and explosive materials.
The machinability of aluminum profile is excellent. In various deformed and cast aluminum alloys, as well as in all kinds of States after the production of these alloys, the machining characteristics change considerably. It requires special machine tools or technologies.
Specific tensile strength, yield strength, ductility and corresponding work hardening rate control the variation of allowable deformation.
Aluminum is high recyclable, and the characteristics of recycled aluminum are almost the same as primary aluminum.