Find in Library

Titanium and its based alloys are frequently selected for designing biomedical implants and it is thus necessary to study as detailed as possible their corrosion behavior in biological solutions, such as those in the human body environment. In this paper, with the use of molecular orbital calculation, we designed and developed alloys in the Ti-19Mo-xW system (x = 7, 8, 9, and 10 wt%) and investigated the influence of different contents of tungsten on the behavior of Ti-19Mo-xW alloy samples following corrosion in simulated body fluid (SBF). The values of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mi>B</mi><mi>o</mi></mrow><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula> (bond order) and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mi>M</mi><mi>d</mi></mrow><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula> (the metal—orbital energy level) were calculated for each alloy and correlations were established between <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mi>B</mi><mi>o</mi></mrow><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula> and the content of tungsten. It was found that with the increase in tungsten content, the value of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mover accent="true"><mrow><mi>B</mi><mi>o</mi></mrow><mo stretchy="true">¯</mo></mover></mrow></semantics></math></inline-formula> increases. Regarding the values of the corrosion resistance in SBF that resulted from the investigated alloys, the Ti19Mo7W alloy is distinguished by the lowest value of the corrosion current density and the lowest corrosion rate.