Corrosion of Titanium Alloys in High Temperature Seawater = Corrosion of Titanium Alloys in High Temperature Seawater

다국어 초록 (Multilingual Abstract)

Materials of choice for offshore structures and the marine industry have been increasingly favoring materials that offer high strength-to-weight ratios. One of the most promising families of light-weight materials is titanium alloys, but these do have two potential Achilles¡- heels: (i) the passive film may not form or may be unstable in low oxygen environments, leading to rapid corrosion; and (ii) titanium is a strong hydride former, making it vulnerable to hydrogen embrittlement (cracking) at high temperatures in low oxygen environments. Unfortunately, such environments exist at deep sea well-heads; temperatures can exceed 120 ¡ÆC, and oxygen levels can drop below 1 ppm. The present study demonstrates the results of investigations into the corrosion behavior of a range of titanium alloys, including newly developed alloys containing rare earth additions for refined microstructure and added strength, in artificial seawater over the temperature range of 25 ¡ÆC to 200 ¡ÆC. Tests include potentiodynamic polarization, crevice corrosion, and U-bend stress corrosion cracking.

참고문헌 (Reference)

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