Chapter 17 | Titanium
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Published:2022
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As a reactive and active-passive metal, titanium's exceptional corrosion resistance and passivity in a vast range of environments stems from the formation and maintenance of of a highly stable and protective titanium oxide surface film. Understanding both the environmental and metallurgical factors affecting passive oxide film formation are key for consideration and selection of relevant and meaningful corrosion test methods for titanium and its alloys. This chapter provides an overview of relevant, potential forms of titanium corrosion damage and embrittlement which may be expected under certain laboratory test conditions and in some industrial service environments; along with the corresponding, applicable ASTM and other industry accepted which corrosion test methods generally used to assess this behavior. With its unique suite of physical, mechanical, corrosion, and electrochemical properties compared to the other common engineering metals, successful testing of titanium often requires additional consideration in regards to adjustments and corrections in test input and output parameters and calculations, and/or some modification in coupon/specimen handling procedure and treatment before and after test exposure. This test specific guidance for titanium and its alloys is addressed as well where appropriate.