Influence of temperature on the electrochemical and passivation behavior of 2507 super duplex stainless steel in simulated desulfurized flue gas condensates

Corrosion behavior of aluminum in molten hydrated salt phase change materials for thermal energy storage

“…However, there is no evident shift of OCP measured from pH 2 medium. Generally, the positive displacement of OCP with time is attributed to the acceleration of cathodic process or the inhibition of anodic process at the metal/solution interface [49]. The former seems less possible in the present case due to the absence of necessary incorporation of alloy impurities, while the later is related to the growth of surface oxide film, which better explains the phenomenon [49,50].…”

“…Generally, the positive displacement of OCP with time is attributed to the acceleration of cathodic process or the inhibition of anodic process at the metal/solution interface [49]. The former seems less possible in the present case due to the absence of necessary incorporation of alloy impurities, while the later is related to the growth of surface oxide film, which better explains the phenomenon [49,50]. Especially for the specimen immersed in moderately acidic (pH 4) and neutral medium (pH 7), the OCP commences with a rapid increase in the initial 800 s, which is likely indicative of a fast film formation on Al-1060 electrode surface.…”

Passive film properties of Z3CN20.09M duplex stainless steel aged for different times

“…R f and CPE f ( Q f ) represents the passive film, R ct and CPE dl ( Q dl ) represents the electrolyte/passive film interface, and R s is the solution resistance. The equivalent circuits consist of solution resistance R s connected in series with two time constants R ct [ Q dl ( R f Q f )] . The using of a constant phase element (CPE) instead of an ideal capacitor was necessary due to the distribution of relaxation times associated with heterogeneities (roughness and surface defects) at the surface of the working electrodes.…”

“…After background subtraction according to Shirley, the XPS results are separated into contributions of the different oxidation states by a fit procedure described in previous reports. Spectra deconvolution of the primary compounds of the Z3CN20.09M DSS passive film (iron, chromium, nickel, oxygen) are performed based on the corresponding binding energies according to the NIST database and previous reports, as listed in Table . The spectra for the passive films in the surface of stainless steel with different aging times represent almost the same specie of film composition.…”

“…Semiconductive properties are often observed on the surface of the passive metals, and either p‐ or n‐type behaviors are determined according to the predominant defects . Moreover, many factors influence the properties of passive film and corrosion resistance of materials, like temperature, potential of forming film, aggressive ions, element content, and so on . However, there is no information available about the corrosion and passive behavior of Z3CN20.09M DSS aged different times.…”