Industrial aluminum profile oxidation treatment process flow
After oxidation, the surface of industrial aluminum profiles has a very beautiful appearance and is resistant to dirt. Once coated with oil, it is very easy to clean. When assembling products, different specifications of profiles are used according to different load-bearing capacities, and matching aluminum profile accessories are used, which do not require welding and are more environmentally friendly. In addition, installation and disassembly are lightweight, easy to carry, and extremely convenient to move. Industrial aluminum profile oxidation treatment process flow.
① Surface treatment of aluminum profiles:
Aluminum profile surface treatment, also known as surface pretreatment, is the use of physical and chemical substances to remove dirt from the surface of aluminum profiles, exposing them to the aluminum profile body, and facilitating oxidation treatment of the aluminum profile surface in the later stage.
② Surface degreasing process for aluminum profiles:
The purpose of the aluminum profile degreasing process is to remove industrial lubricating oil and anti-corrosion oil on the surface of the aluminum profile, as well as dirt and impurities attached to the surface of the profile, to ensure uniform alkaline corrosion of the aluminum profile, and to ensure the cleanliness of the alkaline corrosion groove; Advance the surface treatment quality of aluminum profiles.
③ Aluminum profile acid etching process:
The acid corrosion process on the surface of aluminum profiles is carried out after degreasing, with the primary purpose of removing the oxide formed by the oxidation of other metal elements on the surface of the aluminum profile and the oxide film naturally formed by the profile; After acid corrosion treatment, it is necessary to immediately carry out water washing, with the washing temperature controlled at 50 ℃ earlier to avoid flow marks on the surface of the profile, and then carry out active water cleaning. Due to the presence of copper in aluminum profiles, the surface darkens after acid corrosion testing. It is necessary to soak in nitric acid solution for 3-5 minutes to make the surface appear bright silver.
④ Aluminum profile alkaline corrosion process:
The primary purpose of the alkaline etching process for aluminum profiles is roughly the same as the acid etching process, which removes residual substances and transformation layers on the surface of the aluminum profile during the oxidation process, as well as eliminates scratches and defects left on the surface of the aluminum profile during the kneading process; Alkaline corrosion treatment on the surface of aluminum profiles plays a crucial role in the overall quality of the surface.
⑤ Aluminum profile neutralization process:
The purpose of the neutralization process for aluminum profiles is to remove alloy elements or impurities such as copper, manganese, iron, and silicon that remain insoluble in alkaline solutions on the surface of aluminum profiles after acid and alkali corrosion treatment. The alkaline solution remaining in aluminum profiles after alkali corrosion treatment is usually neutralized by using a 30% -50% nitric acid solution. For high silicon aluminum alloys, a mixed acid with a volume ratio of nitric acid and hydrogen fluoride of 1:3 is used to form the alloy. Silicon reacts with hydrogen and hydrofluoric acid to form fluorosilicic acid, which detaches from the surface of aluminum.
⑥ Anodizing treatment of aluminum profiles:
The method of anodizing aluminum profiles is to use a solution as the medium and select a tip discharge to form a layer of oxide film on the surface of the aluminum profile, making it have strong corrosion resistance. Due to the high hardness and corrosion resistance of the protective layer obtained from anodized aluminum profiles, the standard thickness is 10-12 μ, which can better enhance the oxidation resistance and beauty of the aluminum profile.
Sulfuric acid anodizing commonly uses 10-20% H2SO4 as the electrolyte, with a working temperature of 15-20 ℃ and a current density of 1-2.5A/dm2. The electrolysis time depends on the film thickness requirements, usually between 20-60 minutes. The power supply is widely used with direct current, and the applied voltage varies depending on the conductivity, temperature, and aluminum content of the electrolyte, usually 15-20V. The process parameters have a significant impact on the function of the membrane.
⑦ Surface sealing treatment of aluminum profiles:
After anodizing treatment, the surface of aluminum profiles will form micropores, which are easily oxidized and corroded during use. Sealing treatment should be carried out after anodizing treatment. The sealing treatment method for industrial aluminum profiles after anodizing is generally using the cold air process (cold sealing process originated from Europe). Sulfuric acid anodizing commonly uses 10-20% H2SO4 as the electrolyte, with a working temperature of 15-20 ℃ and a current density of 1-2.5A/dm2. The electrolysis time depends on the film thickness requirements, usually between 20-60 minutes. The power supply is widely used with direct current, and the applied voltage varies depending on the conductivity, temperature, and aluminum content of the electrolyte, usually 15-20V. The process parameters have a significant impact on the function of the membrane.
