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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