Introduction to Industrial Aluminum -type Electroplating Process and Operation Process! -Ruminum Profiles Supplier
Author： WJW Aluminum Window Manufacturers
Electroplating refers to the use of electrolytic principles to form a dense and uniform metal protective layer on the metal surface. The purpose is to improve the corrosion resistance, strength and abrasion resistance of the metal surface to enhance its mechanical properties and decorative effects. The following is a practical example to illustrate the specific operation method of industrial aluminum plating technology. Example: grinding and polishing of industrial aluminum profiles Remove polishing wax suspension chemical dehydration strong acid and white pickled removal membrane neutral nickel plating dehydrogenation of coating light treatment
(1) Remove polishing wax: For industrial aluminum profiles, especially aluminum profiles with large surface oily, organic solvents should be used for cleaning. It can remove surface oil stains or polished waxes, or can use room temperature skilled and wax divisions instead of organic solvents to achieve better results.
(2) Chemical abandonment: Use 20g / L sodium hydroxide solution, 5ml / L promoter, soak 30-60s at a temperature of 30-50 C.
Once the aluminum profile enters the sodium hydroxide solution, the surface will begin to dissolve to remove the surface of the surface and remove the oil on the surface.
At this time, there is a layer of black -gray on the surface of the industrial aluminum profile, which must be removed with strong acid.
(3) Strong acid increase: ie, acid erosion, HF3 with a concentration of 70 % and HF with a concentration of HF to prepare a strong acid increase solution, but the acid concentration should not be too high, otherwise it will cause a large amount of harmful gases. Under these conditions, under these conditions, Running can reduce the emergence of harmful gases, reduce corrosion of the surface of industrial aluminum profiles, increase the brightness of the surface of aluminum profile, increase the binding force between coatings and substrates, and help better electroplating.
(4) Pickled off -the -membrane: Use 35 % acids and 15 % sulfuric acid to formulate a pickled off -membned solution.
(5) Pre-immersive solution: also known as zinc immersion, use 50-150 g / L sodium hydroxide, 5-15g / L hydrogenation and 10-30ml / L grinding machine, penetrate 5-20s at room temperature 5-20s It is more suitable for electroplating to use large -scale industrial aluminum profiles in large -scale production. It first dissolves the oxide film on the surface of the aluminum profile, and then generates a uniform zinc alloy layer of 0.1 m through micro -etching and micro -battery to prevent the aluminum alloy surface from oxidizing. The zinc -soaked layer has a very good bridge connection. Improving the combination of coating plays a very important role. Pay attention to a few points when immersion.
First of all: the hanger used for zinc should not include copper, because the contact part of the copper and industrial aluminum profiles will have a replacement reaction; second: In order to reduce the production of bubbles, the hanger must move up and down; 3: In order to prevent the occurrence of spots, first of first Wash the zinc after immersion in the water; fourth: It is recommended not to immerse zinc in the air for a long time.
(6) Neutral nickel plating: use 200g / L nickel sulfate, 15g / L sodium chloride, 220 g / L sodium carbonate and an appropriate amount of additives, soak 5-8min at 40-50 C at a temperature of 40-50 C to obtain bright milk white nickel. You can also be plated on the nickel layer on the top layer of bright copper, double -layer nickel or a layer of bright nickel, all of which can get good adhesion. Coating dehydrogenation: Dry removal in the hydrogen method and dry for 1.5 hours at a temperature of 800-100 C. (7) Light treatment: At room temperature, use a 10 % nitrate solution to immerse the industrial aluminum profile into 1-3s, and then quickly remove and clean, so as to avoid excessive oxidation time and black, such as copper plating, zinc and cadmium. When electroplating (that is, the medium and high temperature hydrolysis salt sealing method mentioned in the previous section), you need to use 200g / L sodium chromium chromate and 10ml / L sulfate solution. Soak 15s at room temperature for hydrolyzed salt sealing treatment. Light treatment of aluminum profiles.
