Titanium alloy having excellent corrosion resistance in environment containing bromine ions

Abstract

[Object] To provide a titanium alloy having corrosion resistance that is as high as or higher than before, and high corrosion resistance in a bromine-ion-containing environment, the alloy being able to be manufactured at low cost. [Solution] Provided is a titanium alloy to be used in a bromine-ion-containing environment, the titanium alloy consisting of, in mass%, a platinum group element: greater than or equal to 0.01% and less than or equal to 0.10%, a rare earth element: greater than or equal to 0.001 % and less than 0.02%, O: greater than or equal to 0% and less than 0.1 %, and the balance: Ti and impurities. The titanium alloy may contain, instead of part of Ti, one or more selected from the group consisting of Ni, Co, Mo, V, Cr, and W. The platinum group element is desirably contained in, in mass%, greater than or equal to 0.01% and less than or equal to 0.05%. The rare earth element is desirably contained in, in mass%, greater than or equal to 0.001% and less than 0.02%.

Description

technical field [0001] The present invention relates to a titanium alloy, and particularly relates to a titanium alloy excellent in corrosion resistance (crevice corrosion resistance in an environment containing bromide ions, acid resistance, etc.) and economical efficiency. Background technique [0002] Titanium is actively used in the field of aircraft and the like, taking advantage of its light and hard properties. In addition, due to its excellent corrosion resistance, titanium is widely used as a material for chemical industry equipment, a material for thermal power / atomic power generation equipment, and a material for seawater desalination equipment. [0003] However, the environment where titanium can exhibit high corrosion resistance is limited to oxidizing acid (nitric acid) environment, neutral chloride environment such as seawater, while the crevice corrosion resistance in high temperature chloride environment, hydrochloric acid and other non-oxidizing acid Corro...

AI Technical Summary

Problems solved by technology

However, for applications requiring further improvement in properties in recent years, especially when the content of Pd is less than 0.05% by mass, the corrosion resistance becomes insufficient.

However, none of these Patent Documents 5 and 6 takes corrosion resistance into consideration, and does not relate to corrosion resistance in an environment containing bromide ions.

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