Unalloyed titanium corrodes at a very low rate in boiling 0.3 percent sulfamic acid and at a rate of over 100 mpy. (2.54 mm/y) in 0.7 percent boiling sulfamic acid. Addition of ferric chloride (0.375 g/l) to the 0.7 percent solution reduces the corrosion rate to …
Titanium corrosion resistance is strongly dependent on the resistance of its protective oxide, which can vary as a function of the surrounding environment. In this section, different common environments in which titanium is used will be reported, together with their effect on the metal.
Titanium has outstanding corrosion resistance due to the external natural oxide protective layer formed when it is exposed to an aerated environment.
Abstract. Titanium is well known as one of the most corrosion-resistant metals. However, it can suffer corrosion attacks in some specific aggressive conditions. To further increase its corrosion resistance, it is possible either to modify its surface, tuning either thickness, composition, morphology or structure of the oxide that spontaneously ...
Hence, titanium is resistant to attack in mixtures of strong sulphuric and nitric acids, hydrochloric and nitric acids and even in strong hydrochloric acid containing free chlorine. The presence in solution of cupric or ferric ions also reduces the corrosion rate, as does alloying with noble metals or the use of an anodic protection technique.
Titanium is Not Corrosion Proof. Although titanium performs well in most corrosive environments, it can be susceptible to degradation under certain conditions. The corrosion resistance of titanium can be severely affected in anhydrous environments, i.e., environments containing little to no water.
The corrosion resistance of titanium in reducing acid media can be enhanced by relatively small concentrations of certain precious metals (of the order of 0.1 wt%). Precious metals (≧ 0.05 wt% Pd), nickel (≧ 0.5 wt% Ni), and/or molybdenum (≧ 4 wt% Mo) are considered beneficial in alloying [17].
Therefore, titanium alloys exhibit excellent corrosion resistance in many environments and have been widely used in important fields such as shipbuilding, aviation, petrochemicals, and so on. However, the corrosion problems of titanium alloys are gradually exposed with increasing applications.
Titanium alloys are widely used in many domains due to their excellent high specific strength and corrosion resistance. Stress plays a very important role in the application of titanium alloys.
This article discusses corrosion resistance of titanium and titanium alloys to different types of corrosion, including galvanic corrosion, crevice corrosion, stress-corrosion cracking (SCC), erosion-corrosion, cavitation, hot salt corrosion, accelerated crack propagation, and solid and liquid metal embrittlement.