Aluminum Coating Significantly Improves The Performance Of Titanium Alloy Fasteners

Titanium alloy fasteners have excellent overall performance and have been widely used in the manufacture of aircraft, especially the advanced large-scale aircraft of the day. They are used for the contact connection of aluminum alloy workpieces in the assembly of fastening parts and connections. However, the surface of the titanium alloy fasteners without surface treatment has a high potential, and the aluminum alloy parts connected to it have a large potential difference. In the humid atmosphere or marine weather, galvanic forces will form, which will cause battery corrosion. In severe cases, it will damage the structure and cause it to fail, causing accidents. Studies have shown that if a coating composed of phenolic resin, aluminum powder, polytetrafluoroethylene (PTFE), and anti-corrosion pigments is coated on the surface of the fastener, no galvanic coupling and corrosion will occur. The coating thickness is 7 to 9µm, which is fine. The thickness specified by relevant foreign standards is 7 to 11µm.