Anti-corrosion applications of titanium materials in the power industry

Titanium has good stability in highly corrosive hot water containing chlorides and sulphides, so it has been widely used as a cooling tube for heat exchangers in coal-fired power plants. After replacing copper-nickel alloy tube with thin-walled titanium tube, not only the service life is greatly improved, but also the overhaul time is greatly reduced, and the economic benefits are remarkable.
Titanium and titanium alloys are highly resistant to corrosion and can also be used in corrosion-resistant linings of steel chimneys. The power plant in Fuzhou City, Fujian Province, uses a seawater desulfurization system without GGH and bypass. Titanium plates are used as anti-corrosion linings for steel chimneys of wet chimneys.
Industrial pure titanium is a thermodynamically unstable metal. If Ti2 plus can be produced by dissolution, the standard electrode potential for titanium ionization is -1. 63 V, which allows titanium to dissolve in water and release hydrogen. However, in a variety of corrosive media, titanium has a very strong corrosion resistance, due to titanium has a great passivation effect. Its passivation exceeds that of cobalt, nickel and stainless steel. In many active media, especially in oxidizing media, chlorine and chloride media, it has excellent corrosion resistance, but titanium in sulfuric acid and hydrochloric acid stability is poor.
In order to solve the problem of poor corrosion resistance of conventional titanium and titanium alloys to reducing media such as sulphuric acid and hydrochloric acid, adding molybdenum (10%32%) to titanium alloy can greatly improve the corrosion resistance of titanium alloy to the reducing medium. The higher the tantalum content, the better corrosion resistance, but smelting and processing more difficult. The main performance is the reinforcement of the alloy, to a certain extent, affect the application of the alloy. Titanium vanadium alloy is more suitable for corrosion protection of steel chimneys than pure titanium. Ti-20MO and above titanium tantalum alloys meet the requirements and are particularly suitable for power plants that use seawater desulfurization due to their strong chloride resistance.
The higher the tantalum content, the better corrosion resistance, but smelting and processing more difficult. The main performance is the reinforcement of the alloy, to a certain extent, affect the application of the alloy. The corrosion resistance of Ti-Mo alloys is shown in Table 2. Titanium vanadium alloy is more suitable for corrosion protection of steel chimneys than pure titanium. Ti-20MO and above titanium tantalum alloys meet the requirements and are particularly suitable for power plants that use seawater desulfurization due to their strong chloride resistance. The higher the tantalum content, the better corrosion resistance, but smelting and processing more difficult. The main performance is the reinforcement of the alloy, to a certain extent, affect the application of the alloy.
The corrosion resistance of Ti-Mo alloys is shown in Table 2. Titanium vanadium alloy is more suitable for corrosion protection of steel chimneys than pure titanium. Ti-20MO and above titanium tantalum alloys meet the requirements and are particularly suitable for power plants that use seawater desulfurization due to their strong chloride resistance. The corrosion resistance of Ti-Mo alloys is shown in Table 2. Titanium vanadium alloy is more suitable for corrosion protection of steel chimneys than pure titanium. Ti-20MO and above titanium tantalum alloys meet the requirements and are particularly suitable for power plants that use seawater desulfurization due to their strong chloride resistance.

Titanium vanadium alloy is more suitable for corrosion protection of steel chimneys than pure titanium. Ti-20MO and above titanium tantalum alloys meet the requirements and are particularly suitable for power plants that use seawater desulfurization due to their strong chloride resistance.

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