TY - JOUR A1 - Sarmiento Klapper, Helmuth A1 - Goellner, J. A1 - Burkert, Andreas A1 - Heyn, Andreas T1 - Environmental factors affecting pitting corrosion of type 304 stainless steel investigated by electrochemical noise measurements under potentiostatic control JF - Corrosion science N2 - Electrochemical noise measurements on anodically polarised type 304 stainless steel surfaces in contact with buffer solutions of neutral pH were performed to study the effect of chloride ions in the nucleation of pitting corrosion. Passive layer stability and susceptibility to pitting corrosion after pickling and passivation at different environmental conditions were also investigated by means of electrochemical current noise measurements under cathodic and anodic polarisation. According to the obtained experimental results pits nucleate independently on the presence of chloride ions. It has been also shown that protectiveness of stainless steel surfaces after pickling strongly depends on the relative humidity of the environment in which the surface is subsequently passivated. KW - A. Stainless steel KW - C. Pitting corrosion KW - C. Passivity KW - B. Potentiostatic PY - 2013 DO - https://doi.org/10.1016/j.corsci.2013.06.005 SN - 0010-938X VL - 75 SP - 239 EP - 247 PB - Elsevier Ltd. CY - Orlando, Fla. AN - OPUS4-29662 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Sarmiento Klapper, Helmuth A1 - Göllner, J. T1 - Electrochemical noise from oxygen reduction on stainless steel surfaces JF - Corrosion science N2 - Oxygen reduction occurring at the passive layer is probably the most important cathodic reaction involved in corrosion processes on stainless steel. Furthermore, the influence of the surface state on the oxygen reduction reaction is a key point for the understanding of the mechanism of localized corrosion on stainless steel. In this study, electrochemical noise measurements under cathodic polarization were carried out to obtain new information about this influence. It has been confirmed that the surface state of stainless steel plays a very important role in the kinetic of this cathodic reaction. Oxygen reduction kinetics was significantly reduced on passivated surfaces and improved on pre-reduced and ground surfaces. In addition, electrochemical current noise measurements allowed to differentiate between the electrochemical activity produced by the oxygen reduction reaction and that due to the reduction of the passive layer, in direct dependence on the characteristics of the different surface states investigated. KW - A. Stainless steel KW - B. Electrochemical noise KW - B. Potentiostatic KW - C. Oxygen reduction PY - 2009 DO - https://doi.org/10.1016/j.corsci.2008.10.009 SN - 0010-938X VL - 51 IS - 1 SP - 144 EP - 150 PB - Elsevier CY - Orlando, Fla. AN - OPUS4-20342 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -