title: Evaluation of anodic behavior of commercially pure titanium in tungsten inert gas and laser welds.
abstract: OBJECTIVE
  This study evaluated the resistance to corrosion in welds made with Tungsten Inert Gas (TIG) in specimens made of commercially pure titanium (cp Ti) in comparison with laser welds.
  
  
  METHODS
  A total of 15 circular specimens (10-mm diameter, 2-mm thick) were fabricated and divided into two groups: control group-cp Ti specimens (n = 5); experimental group-cp Ti specimens welded with TIG (n = 5) and with laser (n = 5). They were polished mechanically, washed with isopropyl alcohol, and dried with a drier. In the anodic potentiodynamic polarization assay, measurements were taken using a potentiostat/galvanostat in addition to CorrWare software for data acquisition and CorrView for data visualization and treatment. Three curves were made for each working electrode. Corrosion potential values were statistically analyzed by the Student's t-test.
  
  
  RESULTS
  Statistical analysis showed that corrosion potentials and passive current densities of specimens welded with TIG are similar to those of the control group, and had lower values than laser welding. TIG welding provided higher resistance to corrosion than laser welding.
  
  
  CONCLUSIONS
  Control specimens welded with TIG were more resistant to local corrosion initiation and propagation than those with laser welding, indicating a higher rate of formation and growth of passive film thickness on the surfaces of these alloys than on specimens welded with laser, making it more difficult for corrosion to occur.
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, Brazil.
authors.forename: Iara Augusta
authors.initials: IA
authors.lastname: Orsi
authors.forename: Larica B
authors.initials: LB
authors.lastname: Raimundo
authors.forename: Osvaldo Luiz
authors.initials: OL
authors.lastname: Bezzon
authors.forename: Mauro Antonio de Arruda
authors.initials: MA
authors.lastname: Nóbilo
authors.forename: Sebastião E
authors.initials: SE
authors.lastname: Kuri
authors.forename: Carlos Alberto D
authors.initials: CA
authors.lastname: Rovere
authors.forename: Valeria Oliveira
authors.initials: VO
authors.lastname: Pagnano
mesh_terms: D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D055664:Electrochemical Techniques; D007834:Lasers; D008422:Materials Testing; D005741:Noble Gases; D010087:Oxides; D012464:Saliva, Artificial; D014025:Titanium / Q000737:chemistry; D014414:Tungsten; D014896:Welding / Q000379:methods*
chemical_list: D003722:Dental Alloys; D005741:Noble Gases; D010087:Oxides; D012464:Saliva, Artificial; D014025:Titanium; D014414:Tungsten