title: Behavior of acid etching on titanium: topography, hydrophility and hydrogen concentration.
abstract: Since acid etching is easily controlled and effective, it has become one of the most common methods of surface modification. However, the behavior of etching is seldom discussed. In this study, different surfaces of titanium were prepared by changing the etching temperature and time. Surface topography, roughness, contact angles, surface crystalline structure, hydrogen concentration and mechanical properties were observed. As a result, surface topography and roughness were more proportional to etching temperature; however, diffusion of hydrogen and tensile strength are more time-related to titanium hydride formation on the surface. Titanium becomes more hydrophilic after etching even though the micropits were not formed after etching. More and deeper cracks were found on the specimens with more hydrogen diffusion. Therefore, higher temperature and shorter time are an effective way to get a uniform surface and decrease the diffusion of hydrogen to prevent hydrogen embrittlement.
authors.affiliation: Guangdong Provincial Stomatological Hospital, Southern Medical University, Guangzhou 510000, People's Republic of China.
authors.forename: Xi
authors.initials: X
authors.lastname: Lin
authors.forename: Lei
authors.initials: L
authors.lastname: Zhou
authors.forename: Shaobing
authors.initials: S
authors.lastname: Li
authors.forename: Haibin
authors.initials: H
authors.lastname: Lu
authors.forename: Xianglong
authors.initials: X
authors.lastname: Ding
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D003460:Crystallization; D004058:Diffusion; D006859:Hydrogen / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D008422:Materials Testing; D013499:Surface Properties; D013696:Temperature; D013718:Tensile Strength; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D017155:Wettability; D014961:X-Ray Diffraction
chemical_list: D006859:Hydrogen; D014025:Titanium