Corrosion Resistance of Titanium/Steel Clad Plates for Desulphurization Chimney of Power Plants

Explosive welding titanium/steel clad plates have been widely used in the preparation of chimney inner barrels for power plants. Titanium/steel clad plates have both the corrosion resistance of titanium alloy and the advantages of steel, so they can be used to produce chimney inner barrels for power plants to satisfy the long running of the chimney inner barrels and ensure the service life of chimney structure. In addition, the cost can be reduced, energy can be saved and the ecological environment can be protected. Therefore, they are more and more popular with power plants. In the present work, the corrosion environment of chimneys was simulated to study the corrosion resistance of the clad plates with and without oxide coating. The results show that the average corrosion rate of the specimen with oxide coating is 0.5 μm/a, and that without coating is 1.5 μm/a. The composition analysis of the titanium oxide coating shows that it was mainly rutile TiO₂. The rutile TiO₂ is composed of the interconnecting TiO₂ octahedron, with high-temperature, low-temperature and corrosion resistance as well as high strength. According to the results above, the process of removing the oxide coating was eliminated in the finishing process of the finished product. As a result, the working period of each clad plate was shortened by two days, and the polishing cost was reduced.