...Abstract In systems carrying freshwater, Mo-bearing stainless steels (type 316) are not more corrosion resistant compared to the Mo-free material (type 304) at welds. Two such observations were investigated and are discussed with respect to “ennoblement” and the cathodic properties...

.... The preferential attack at the heat tinted welds is explained by the potential shift caused by biomineralized MnO₂, preventing repassivation. MIC ennoblement manganese dioxide stainless steel welds INTRODUCTION Stainless steel (SS) is the material of choice in many systems carrying fresh water...

... for modem versions of Types 304/316 stainless steels. austenitic stainless steel Type 304 SS (UNS S30400) Type 316 SS (UNS 31600) pitting crevice corrosion microbiologically influenced corrosion ennoblement SCC cooling water passivation manganese Introduction 300-series stainless steel (SS...

... is explained by the potential shift caused by biomineralized MnO₂, which prevents repassivation of the stainless steel in the water being relatively low in chloride for the particular alloy. MIC ennoblement manganese dioxide stainless steel welds INTRODUCTION Some years ago, a mechanism...

...MIC ennoblement manganese dioxide stainless steel powerplant Cyclovoltammetry with Carbon Paste Electrode with Electrolytic Binder INTRODUCTION About a decade ago, a case of pitting corrosion of stainless steel (SS) in a hydroelectric power plant (HPP) was reported ¹ . Corrosion...

...Abstract 316L stainless steel and Tİ-6A1-4V corrosion coupons exposed to fresh river water ennobled the open circuit potential (OCP) to values of +365 mV_SCE and +400 mV_SCE, respectively. ToF-SIMS spectra indicated that the biominerals on the metal surfaces are a mixture...

...Abstract Ennoblement of open circuit potential (OCP) for stainless steel in natural seawater was analyzed. OCPs of platinum, gold, palladium, chromium, titanium and nickel ennobled in natural seawater as well as that of stainless steel, SUS304 (18Cr-8Ni). OCP ennoblement is not a specific...

... * Corresponding author: Zbigniew Lewandowski. E-mail: [email protected] Ennoblement manganese-oxidizing bacteria microbially influenced corrosion biominerals passive films XPS ESCA TofSIMS INTRODUCTION Numerous studies have reported increases from -200 mV_SCE to +350...

... describes the case of localized corrosion of type 316L thermo-wells installed in a seawater cooling system of a power plant. Susceptibility to localized corrosion of type 316L in biocide-treated seawater service is discussed with respect to dissimilar metal coupling with titanium. Titanium ennobled...

... open-circuit potentials of +250 mV (SCE), about 150 mV higher than achieved by samples exposed to sterile solutions in the laboratory. However, factors other than potential ennoblement and formation of iron-rich surface films are most probably involved in MIC of stainless steels. Possibilities include...

...The open circuit potential of the metal is determined from the equilibrium between manganese oxides deposited on the surface with manganese ions in the solution. The anticipated half reactions are: Abstract Ennoblement of stainless steel by microbially deposited manganese oxides can cause pitting...

... circuit potential (OCP) of stainless steels in the electropositive direction by several hundred millivolts. One of the reasons for this ennoblement is thought to be the presence of Mn in biofilms. Two stainless steels, UNS NO8367 (6XN, having an n- type passive film) and NO6455 (C4 with a p-type film...

... currents as generated by reaction ( 3 ) alone ⁵ . On the other hand, Dickinson et al. have ruled out the influence of O₂ on the basis of potentiodynamic measurements with coupons of SS ennobled by MnO₂-deposits in a natural environment ⁶ . To yield information...

... discophora SP-6 biofilm mineral deposit biomineralization manganese dioxide corrosion ennoblement 316L stainless steel surface analysis x-ray photoelectron spectroscopy (XPS) electron spectroscopy for chemical analyses (ESCA) INTRODUCTION Numerous experiments have indicated that microbial...

... determined within 2 h after sampling as described elsewhere ⁸ . Laboratory experiments INTRODUCTION The ennoblement of the open circuit potential (OCP) of stainless steels immersed in natural sea water has been recognized in different areas of the world ^{1 - 6} . The increase...

...E_corr E_pit manganese dioxide stainless steel pitting biofilm Ennoblement oxygen corrosion potential passive film cathodic depolarizer coulometric titration INTRODUCTION Abstract Corrosion potential (E_corr) for 316L stainless steel coupons was monitored...

...Abstract Ennobled open-circuit potential (E_corr) for stainless steel exposed to fresh river water is investigated using microelectrodes to measure dissolved oxygen, hydrogen peroxide, and local E_corr within the biofilm. Results indicate the biofilm is uniformly aerobic...

...INTRODUCTION Biofilms formed in seawater usually ennoble the passive metal open circuit potential (OCP) ¹ . The reason for the ennoblement is thought to be the changes in chemistry at the metal surface that are brought about by the bacterial metabolism. So far all experiments we know...

...Biofilms have the capability to alter the interfacial chemistry through biotic or abiotic mechanisms or both. Each of these in turn, changes the thermodynamics and kinetics of the cathodic reaction, thus, contributing to ennoblement. The significance of these changes lies in the fact that a noble...

...It is well documented that biofilms from natural waters of all salinities ennoble passive metal corrosion potentials ^{1 - 8} . There have also been a few published instances where ennoblement did not occur ^{9 , 10} . Several mechanisms for potential ennoblement have been advanced...