Sandblasting is a process of cleaning and roughening the surface of products by impact of high velocity sand flow. Compressed air is used as power to form a high-speed jet beam to spray sand onto workpiece surface to be treated. Due to sand impact and cutting action, is given a certain degree of cleanliness and different roughness on workpiece, to increase adhesion between workpiece and the coating, prolonging the durability of the coating film, and also facilitating the leveling and decoration of the coating.

Brushed finishing is a manufacturing process which using sandpaper scraped repeatedly out of line on workpiece surface. In the process, a special film technology after the anode treatment can make the metal surface form a film layer containing the metal component, clearly showing line mark, so that the line of the metal matte is generated.

Anodizing is an electrolytic oxidation process that produces a thin layer of aluminum oxide on workpiece surface. Anodized aluminum thin layer has a thickness of 5 to 30 μm, and hard anodized film has a thickness of 25 to 150 μm.Due to metal oxide film changes the surface state and properties, such as surface color, it helps to improve corrosion resistance, enhance wear resistance and hardness, and protect metal surfaces.

Heat treatment process generally includes three processes of heating, heat preservation and cooling, sometimes only two processes of heating and cooling. Heat treatment generally does not change the shape of the workpiece and the overall chemical composition, but rather imparts or improves performance by changing inside microstructure or surface chemical composition of the workpiece.