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Environmental factors affecting pitting corrosion of type 304 stainless steel investigated by electrochemical noise measurements under potentiostatic control
Affiliation:1. Federal Institute for Materials Research and Testing, BAM, Unter den Eichen 87, 12205 Berlin, Germany;2. Otto-von-Guericke University Magdeburg, Universitaetsplatz 2, 39106 Magdeburg, Germany;1. Department of Nuclear Engineering, Khalifa University, Abu Dhabi, United Arab Emirates;2. Nuclear Security Division, Federal Authority for Nuclear Regulation, Abu Dhabi, United Arab Emirates;3. Nuclear and Quantum Engineering Department, Korea Advanced Institute of Science and Technology, Republic of Korea;1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, PR China;2. Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, PR China;1. Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 139-743, Republic of Korea;2. High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea;1. School of Materials Engineering, North China Institute of Aerospace Engineering, No. 133 Aimindong Road, Langfang, Hebei Province, 065000, China;2. School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing 100191, China
Abstract: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.
Keywords:A  Stainless steel  C  Pitting corrosion  C  Passivity  B  Potentiostatic
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