Electrochemical behavior of SUS316L stainless steelafter surface modification
(1．School of Chemical Engineering,
Dalian University of Technology,Dalian 116012, China;
2．State Key Laboratory for Corrosion and Protection,
Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110016, China)
Dalian University of Technology,Dalian 116012, China;
2．State Key Laboratory for Corrosion and Protection,
Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110016, China)
Abstract: The surface modification for SUS316L stainless steel was carried out by electroplating Rh, ion beam assisted deposition Ta2O5 and sol-gel-derived TiO2. In Tyrode’s stimulated body fluid, the surface modified samples were investigated with electrochemical techniques. The results indicate that the electrochemical stability and dissolution are improved significantly after surface modification. Moreover, as to ion beam assisted deposition Ta2O5 and sol-gel-derived TiO2 film, the metal’s dorbit electron holes filled up by the oxygen electrons make against the adsorption of hydrogen. Thus the cathode process, which is controlled by the hydrogen reduction, is held back. X-ray diffraction analysis of SUS316L stainless steel after surface modification reveal that each method forms the uniform and compact film on SUS316L stainless steel. These films prevent the dissolving of elements and improve passivation property of the SUS316L stainless steel.
Key words: coronary stent; stimulated body fluid; surface modification; electrochemical behavior