Pure Titanium (Ti) can undergo Hydrogen Embrittlement (HE) in corrosive environments like sulfuric and hydrochloric acids as well as other chloride containing solutions such as Sodium Chloride solutions. Hydrogen plays a major role in the fracture process by forming hydrides which will create the crack path during the electrochemical process. The constant load method can be utilized to study the interaction of commercially pure titanium in a corrosive environment under controlled test conditions of temperature and load. The constant load method can produce a corrosion curve that has multiple parameters that can be used to characterize the behavior of the material. The corrosion curve parameters can also be used to formulate a model for life prediction.

The hydrogen-induced cracking (HIC) of the commercial pure titanium (Ti) has been investigated as functions of applied stress and test temperature in hydrochloric acid solutions by using a constant load method. From the results obtained, HIC was related to the fracture of hydride. It was determined that the steady state elongation rate obtained from corrosion elongation curve is a relevant parameter for predicting time to failure and a criterion to assess whether HIC takes place or not. A second parameter, tsstf-1 was found to be an indicator to assess whether HE takes place or not. Furthermore, it was deduced that HIC was qualitatively explained in terms of hydride formation and localized deformation, based on a hydride formation-rupture event at crack tips.

Subject
Acids, Constant load, Materials, Predicted corrosion rate, Fracture surfaces, Transgranular stress corrosion cracking, Stress, Hydrides, Mechanical failure, Elongation, Titanium, Hydrophobic interaction chromatography, Fracture
Keywords:
Stress Corrosion Cracking, Hydrogen Embrittlement, Commercial Pure Titanium, Constant Load Method
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2021
Association for Materials Protection and Performance (AMPP)
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