88 Chemical Propertiescorrosion Behavior

Titanium is used in aerospace and commercial applications because of its high strength-to-density ratio, good fracture characteristics, and generally outstanding corrosion resistance. Titanium's excellent resistance to most environments is the result of its stable, tightly adherent, protective surface film [12]. This film consists basically of TiO2 at the metal-environment interface with underlying thin layers of Ti2O3 and TiO. This film forms naturally and is maintained when the metal and its alloys are exposed to moisture or air. In general, anhydrous conditions such as provided by chlorine or methanol as well as uninhibited

TABLE 8.13 Acid Concentration Limits for ASTM Grades 2,a 7,a and 12" Titanium in Pure Reducing Acids

Acid-Concentration Limit (wt %)b

TABLE 8.13 Acid Concentration Limits for ASTM Grades 2,a 7,a and 12" Titanium in Pure Reducing Acids

Acid-Concentration Limit (wt %)b

Acid/Temperature

Grade 2

Grade 7

Grade 12

HCl

0 0

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