Titanium alloy material

Abstract

[Object] To provide a titanium alloy material containing a platinum group metal, the titanium alloy material being able to sufficiently suppress corrosion accompanying surface roughening. [Solution] Provided is a titanium alloy material including a platinum group metal. When an average value of intensity of background signals in surface mapping analysis using an EPMA surface analysis apparatus is N and N+3N 1/2 is maximum intensity of the background signal of an Fe or S characteristic X-ray, an area ratio at which a signal of an Fe or S characteristic X-ray exceeding the maximum intensity is obtained is 0.1% or less.

1 - 7 . (canceled) 
     
     
         8 . A titanium alloy material comprising:
 a platinum group metal,   wherein, when an average value of intensity of background signals in surface mapping analysis using an EPMA surface analysis apparatus is N and N+3N 1/2  is maximum intensity of the background signal of an Fe characteristic X-ray, an area ratio at which a signal of an Fe characteristic X-ray exceeding the maximum intensity is obtained is 0.1% or less.   
     
     
         9 . A titanium alloy material comprising:
 a platinum group metal,   wherein, when an average value of intensity of background signals in surface mapping analysis using an EPMA surface analysis apparatus is N and N+3N 1/2  is maximum intensity of the background signal of a S characteristic X-ray, an area ratio at which a signal of a S characteristic X-ray exceeding the maximum intensity is obtained is 0.1% or less.   
     
     
         10 . The titanium alloy material according to  claim 8 ,
 wherein the area ratio at which the signal of the Fe characteristic X-ray exceeding the maximum intensity is 0.05% or less and the area ratio at which the signal of the S characteristic X-ray exceeding the maximum intensity is 0.05% or less.   
     
     
         11 . The titanium alloy material according to  claim 9 ,
 wherein the area ratio at which the signal of the Fe characteristic X-ray exceeding the maximum intensity is 0.05% or less and the area ratio at which the signal of the S characteristic X-ray exceeding the maximum intensity is 0.05% or less.   
     
     
         12 . The titanium alloy material according to  claim 8 ,
 wherein a content of Fe obtained by point analysis of part in which Fe is present on the surface of the titanium alloy material is 0.5 or less in atomic ratio of Fe with respect to Ti.   
     
     
         13 . The titanium alloy material according to  claim 10 ,
 wherein a content of Fe obtained by point analysis of part in which Fe is present on the surface of the titanium alloy material is 0.5 or less in atomic ratio of Fe with respect to Ti.   
     
     
         14 . The titanium alloy material according to  claim 11 ,
 wherein a content of Fe obtained by point analysis of part in which Fe is present on the surface of the titanium alloy material is 0.5 or less in atomic ratio of Fe with respect to Ti.   
     
     
         15 . The titanium alloy material according to  claim 8 ,
 wherein the platinum group metal is contained in 0.01 to 0.25% by mass.   
     
     
         16 . The titanium alloy material according to  claim 9 ,
 wherein the platinum group metal is contained in 0.01 to 0.25% by mass.   
     
     
         17 . The titanium alloy material according to  claim 8 ,
 wherein at least one selected from the group consisting of Ni in 0.05 to 1.0% by mass, Cr in 0.05 to 0.3% by mass, and Mo in 0.05 to 0.5% by mass is further contained.   
     
     
         18 . The titanium alloy material according to  claim 9 ,
 wherein at least one selected from the group consisting of Ni in 0.05 to 1.0% by mass, Cr in 0.05 to 0.3% by mass, and Mo in 0.05 to 0.5% by mass is further contained.   
     
     
         19 . The titanium alloy material according to  claim 15 ,
 wherein at least one selected from the group consisting of Ni in 0.05 to 1.0% by mass, Cr in 0.05 to 0.3% by mass, and Mo in 0.05 to 0.5% by mass is further contained.   
     
     
         20 . The titanium alloy material according to  claim 16 ,
 wherein at least one selected from the group consisting of Ni in 0.05 to 1.0% by mass, Cr in 0.05 to 0.3% by mass, and Mo in 0.05 to 0.5% by mass is further contained.   
     
     
         21 . The titanium alloy material according to  claim 8 ,
 wherein Pd is contained in 0.01 to 0.25% by mass as the platinum group metal.   
     
     
         22 . The titanium alloy material according to  claim 9 ,
 wherein Pd is contained in 0.01 to 0.25% by mass as the platinum group metal.