Analysis of corrosion performance of titanium screws in motorcycle modification

Titanium fasteners are a wide range of general basic parts, including titanium screws, titanium screws, titanium studs, titanium nuts, titanium tapping screws, titanium washers, titanium retainers, titanium pins, titanium rivets and assemblies and other 12 categories, widely used in general machinery, construction machinery and national defense industry and other fields.

The quality and reliability of titanium fasteners play an important role in the working performance and structural safety of the host. Some corrosion prevention measures will also affect the performance of parts, for example, commonly used electroplated fasteners may appear hydrogen embrittlement; The thicker surface coating of titanium screws will affect the screw rotation and may also affect the connection strength. Motorcycle modified titanium screws have high specific strength, excellent corrosion resistance, good high temperature resistance, etc., and have been widely used in the national defense industry such as aviation, aerospace, ships, ground weapons and equipment. Titanium alloy fastener connector is a typical structural part on aircraft and ground weapons equipment. Its failure failure includes the fatigue of fastener itself, the fatigue of connecting plate fastening hole and corrosion fatigue. Under normal circumstances, the surface of titanium and titanium alloy can generate a dense oxide film, which plays a role in anti-corrosion, but in harsh environments or when the oxide film breaks and cracks corrosion occurs, the corrosion resistance of titanium alloy will be greatly reduced Motorcycle modified titanium screws have good corrosion resistance, is a commonly used fastener material in the Marine environment, itself is not affected by natural water, Marine environment and seawater below 80℃ corrosion. Titanium has good corrosion resistance because its surface is tightly attached to a protective oxide film, once the film is damaged, in the case of aerobic, it can be automatically repaired instantaneously. However, in actual use, when environmental conditions change (such as an increase in temperature, an increase in the concentration of a medium and contact with other corrosion-prone metals, etc.), corrosion may occur. Under the coating, pitting can occur as the coating breaks or fails. For titanium alloys with passivated films on the surface, the role of passivated films on the surface of titanium alloys is reduced due to insufficient oxygen supply in static or low-velocity seawater, and pitting corrosion may also occur.

Titanium alloy fasteners, like other easily passivated metals, are prone to gap corrosion and hydrogen embrittlement, but gap corrosion usually occurs in high temperature solutions containing halogen ions. When motorcycle modified titanium screws are combined with more inert metals, they will be subjected to galvanic corrosion, and the greater impact is the brittle intergranular fracture corrosion caused by hydrogen absorption at the expense of anode or cathodic protection.