11.Differences and advantages between electroless aluminum plating and vacuum aluminum plating?
Vacuum aluminizing is to heat aluminum into steam in a vacuum environment, which condenses when cold, just like steam condenses on the pot cover, and is widely used in the processing of cathode ray tubes. Electroless aluminum plating is generally carried out by chemical solvent through chemical reaction, which inevitably needs to treat waste liquid and is not environmentally friendly. And the cost is higher.
22.What is food grade aluminum plating?
Aluminum plating film is a film with bright metal color formed by evaporating high-purity aluminum wire at high temperature (1100~1200℃) and precipitating gaseous aluminum molecules on the surface of plastic film.
33.Difference between aluminized steel plate and aluminized zinc steel plate?
Firstly different meanings: 1) The aluminized steel plate is coated with a layer of pure aluminum or aluminum-silicon alloy containing 5%~10% silicon on the surface of carbon steel. 2) Aluminum-zinc plated steel plate is an alloy-coated steel plate with aluminum-zinc alloy coating treatment on the surface of steel plate, which is composed of 55% aluminum, 43.4% zinc and 1.6% silicon solidified at 600℃. Its whole structure is composed of aluminum-iron-silicon-zinc, forming dense quaternary crystals.
Secondly, the characteristics are different: 1) Aluminum-plated steel plate has unique properties such as good corrosion resistance, heat resistance and heat radiation, which has been more and more appreciated by people. The aluminized steel plate has good corrosion resistance when used in the environment of heat radiation, acid, condensate and atmospheric corrosion. 2) Aluminum-zinc plated steel plate has many excellent characteristics: corrosion resistance, heat resistance, heat reflectivity and economy.