| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of uniformly producing a pure titanium thin sheet having low glosiness, high whiteness and excellent antidazzle characteristic at a high yield. SOLUTION: By regulating the surface roughness Ra of a pure titanium thin sheet to >=10μm and executing pickling in a mixed soln. of nitric acid and hydrofluoric acid, its glosiness is regulated to <=100% by about 10μm of dissolution per face, its whiteness is regulated to >=75, and furthermore, unevenness can be made hard to be conspicuous. Moreover, by regulating the ratio of the nitric acid concn. to the hydrofluoric acid concn. in the mixed aq. soln. of nitric acid and hydrofluoric acid to 0.2 to 3 times or regulating the grain size toη40μm the glosiness can be regulated to <=50%. Furthermore, by regulating the ratio of the nitric acid concn. to the hydrofluoric acid concn. in the mixed aq. soln. of nitric acid and hydrofluoric acid to 0.2 to 3 times and regulating the grain size to <=40μm, the glosiness can be regulated to <=30%.
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