Because titanium itself has excellent corrosion resistance, it is generally not carried out to further improve its corrosion resistance surface treatment, but in order to prevent the corrosion of titanium in the more susceptible hydrochloric acid, sulfuric acid and other non-oxidizing acid aqueous solutions, prevent the corrosion in the NaCl aqueous solution In crevice corrosion and pitting corrosion, surface treatment is sometimes used.
Atmospheric oxidation treatment: if the titanium is kept in high temperature atmosphere, the oxide film will be thickened, and the film thickness will increase with the increase of temperature and time. Atmospheric oxidation treatment is effective for the overall corrosion and crevice corrosion of titanium. The method is relatively simple, but the durability is not very reliable. This is because the atmospheric oxidation treatment only thickens the oxide film, and pure titanium thickens the oxide film in a corrosive environment. It becomes thinner over time and eventually leads to corrosion. The maintenance time of its corrosion resistance is determined by the atmospheric oxidation treatment conditions (T, t) and the harshness of the corrosive environment. It is very difficult to predict this time in detail. This method is generally not used for component materials that require long-term stable operation.
The shortcomings of titanium are poor wear resistance and defects such as pitting on the surface. At present, it is difficult to apply to sliding mechanical parts. Currently, various surface treatment methods are being actively researched and developed. The methods suitable for titanium surface treatment include wet coating method represented by Cr and Ni, thermal diffusion method, surfacing method and sputtering method. The more advanced methods are CVD, PVD, and PCVD surface strengthening methods.
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