title: Corrosion behaviour of Nitinol alloy coated with alkylsilanes and polypyrrole.
abstract: Nitinol (equiatomic Ni and Ti alloy (NiTi)) substrate was modified using a coating system formed by a self-assembled film of alkylsilane compounds (propyltrichlorosilane (C3H7SiCl3) or octadecyltrichlorosilane (C18H37SiCl3)) and polypyrrole (PPy) doped with sodium bis(2-ethylhexyl) sulfosuccinate (Aerosol OT or AOT). The combination of alkylsilanes and the presence of a voluminous molecule like AOT entrapped into the PPy films improve the pitting corrosion resistance of the substrate in chloride solution. The best performance was achieved with the longest alkylsilane chains, where the PPy film remains adhered to the underlying coating after a pitting corrosion test.
authors.affiliation: Instituto de Ingeniería Electroquímica y Corrosión (INIEC), Departamento de Ingeniería Química, Universidad Nacional del Sur, Av. Alem 1253, 8000 Bahía Blanca, Argentina.
authors.forename: D O
authors.initials: DO
authors.lastname: Flamini
authors.affiliation: Instituto de Ingeniería Electroquímica y Corrosión (INIEC), Departamento de Ingeniería Química, Universidad Nacional del Sur, Av. Alem 1253, 8000 Bahía Blanca, Argentina. Electronic address: ssaidman@criba.edu.ar.
authors.forename: S B
authors.initials: SB
authors.lastname: Saidman
mesh_terms: D000497:Alloys / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003343:Corrosion; D055664:Electrochemical Techniques; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D012821:Silanes / Q000737:chemistry*; D012996:Solutions; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry
chemical_list: D000497:Alloys; D020099:Coated Materials, Biocompatible; D011108:Polymers; D011758:Pyrroles; D012821:Silanes; D012996:Solutions; C013616:nitinol; C067635:polypyrrole; D009532:Nickel; D014025:Titanium
keywords: Alkylsilanes; Corrosion protection; Electropolymerisation; Nitinol alloy; Polypyrrole