In the machining industry, the surface treatment process is needed in the general parts processing technology. Surface treatment is mainly to meet the requirements of corrosion resistance, wear resistance, decoration or other special functions of processed products. For mechanical equipment accessories, automation equipment processing parts, we are more commonly used surface treatment methods are chemical treatment, surface heat treatment, oxidation surface, surface treatment for workpiece surface cleaning, cleaning, deburring, degreasing, descaling and so on. Let’s take a look at the difference between the blackening treatment of aluminum and steel!
Blackening of steel is a common surface treatment process and a common means of chemical surface treatment. The principle is to produce a layer of oxide film on the metal surface to isolate air and achieve the purpose of rust prevention. General mechanical equipment accessories, CNC processing parts appearance requirements are not high, can use blackening treatment, steel processing surface blackening treatment, also known as bluing treatment.
In the field of mechanical parts processing, aluminum is one of the most widely used materials. Aluminum blackening is anodizing aluminum in sulfuric acid electrolyte by current action, forming a thin layer of about 10 micron oxide film on aluminum surface, and then dyeing with black organic dye. Because the artificially formed oxide film has many small pores invisible to the naked eye, melanin can enter all the pores, which turns the silver white aluminum surface into black. In order to achieve black matte, sandblasting can be carried out before oxidation to form matte surface. After oxidation and coloring, it becomes matte black.
Aluminum and steel material density is different, surface treatment is not the same, its common purpose is to remove oil, rust. The above is the difference between machining aluminum and steel blackening treatment
ken. tang@chengcg.com
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