ã€China Aluminum Network】Choose what kind of solution will be used to brush the bottom layer, which will directly affect the quality of the coating. According to different substrates, select the appropriate solution. Special nickel has a very high bond strength to most of the metals on the substrate. It is commonly used on substrates such as steel, iron, copper, chromium, and stainless steel. For a substrate with a relatively high hardness, a low-stress solution should be selected. For materials such as cast aluminum and cast aluminum alloys, the materials are relatively loose and the porosity is relatively high. It is not appropriate to use a solution with strong acidity to brush the substrate, and the alkaline copper solution is selected for comparison. Suitable for. The specific process flow is as follows: Generally speaking, the Bolt is used to connect two objects, usually through the smooth hole, which needs to be used together with the nut, and a single bolt does not work. The tools are usually spanners. The head is mostly hexagonal, generally larger. The carriage bolt is used in the groove. The square neck is stuck in the groove during the installation process, which can prevent the bolt from rotating. The carriage bolt can move in parallel in the groove. Because the head of the carriage bolt is round, there is no cross groove or inner hexagon, which can be used to assist the design of tools. In the actual connection process, it can also play the role of anti-theft. Carriage Bolts,Railway Bolts And Nuts,Guardrail Bolts And Nuts,Automotive Thread Rod Bolts Suzhou Gubao Screws Co.,Ltd. , https://www.hongyiscrew.com
1) Electrolytic degreasing with 2# electrocleaning to remove oil.
2) Rinse with tap water.
3) activation with 1 # activation liquid, reverse, l0 ~ 15V, the amount of electricity is 0.7 ~ 1A h / dm2.
4) Rinse with water.
5) Basic copper bottoming. Positive. 6 ~ 8V, 1 ~ 2μm.
6) Rinse with tap water.
7) Brush the working layer.
Materials: carbon steel, Q235, 45? Steel, stainless steel
Nominal diameter: 5mm-20mm
Length: 15mm -- 300mm
Surface treatment methods: zinc plating, chromium plating, copper plating, surface blackening