Surface Protection Strategie For Titanium

Titanium alloys face a variety of potential risks during processing and use. The blades are easily damaged during machining and polishing, and the destruction of surface integrity will significantly reduce the fatigue performance of parts. In addition, titanium alloys have poor anti-pollution ability and are prone to electrochemical corrosion when in contact with certain metals. They have low hardness, poor wear resistance, and are sensitive to hot salt stress corrosion. These characteristics are more likely to cause serious accidents in power systems, especially when serving in marine environments.

To ensure the integrity and performance of titanium alloy parts, a series of protective measures need to be taken during the processing. First of all, the cutting process should use machine tools and cutting tools with good rigidity, as well as special tooling with low vibration and strong rigidity. The tooling surface must not have active metal coatings to prevent electrochemical corrosion. The cutting depth should exceed the thickness of the cold work hardening layer, and the tool must have wear resistance and high thermal hardness.

Heat treatment of titanium alloy is a key step to eliminate residual stress and improve performance. During the heat treatment process, the titanium alloy surface must be free of oil, fingerprints and other contaminants. Heat treatment fixtures must be made of stainless steel or high-temperature alloys, and the surface must be kept clean. For precision-machined titanium alloy parts, heat treatment must be carried out in a vacuum furnace or under argon protection to prevent oxidation.

Hydrogen embrittlement is a common risk of titanium alloys in chemical processing. To prevent hydrogen embrittlement, effective anti-hydrogen coatings must be used during heat treatment of titanium alloys, and hydrogen must be removed in time after treatment. Hydrogen is an extremely harmful impurity in titanium alloys. It has a small diffusion coefficient and is not easy to escape from the coating. Therefore, strict measures must be taken to prevent excessive hydrogen absorption.