The Inhibition of Pitting Corrosion in Stainless Steel 304 L During Proton Irradiation

Lillard, R. S.; Vasquez, G.

doi:10.1149/1.2840462

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…The semiconducting surface passive films respond spontaneously to illumination (Fujimoto and Tsuchiya 2007), thus providing significance to the present theme of work. The second reason was the more insightful and straightforward one, based on the fact that a number of investigators have reported a decrease in the corrosion rates and a reduced probability of localized corrosion upon ultraviolet (UV) illumination of SS (typically UNS S30400) in neutral chloride solutions (Lenhart et al 1987;MacDonald and Heaney 2000;Moussa and Hocking 2001;Fujimoto and Tsuchiya 2007;Lillard and Vasquez 2008). Quite the reverse, reports of an accelerating effect of UV illumination on the corrosion of certain other alloys such as copper and zinc have also been made (Burleigh et al 2003; Thompson and Burleigh 2007).…”

Section: Introductionmentioning

confidence: 99%

The influence of sunlight on the localized corrosion of UNS S31600 in natural seawater

et al. 2011

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Tests were conducted on the performance of UNS S31600 stainless steel (SS) in a natural day/night cycle vs full darkness under conditions of natural marine biofilm accumulation. In quiescent flowing seawater tests in the laboratory as well as under natural immersion in the sea, diffuse sunlight (∼10% of natural) counteracted the influence of marine biofilms and produced substantial inhibition of the corrosion of SS. Thus, the probabilities (percentage attack) and propagation rates (depths of attack) in multiple crevice tests were substantially lower in the day/night cycle than in the dark. A benefit was also observed for welded SS in terms of the time to corrosion initiation and the mass loss. SS in the passive state showed broader passive regions, well-defined breakdown potentials and markedly smaller anodic and cathodic current densities under the diurnal cycle. The overall reduction in corrosion is attributed to a combination of electrochemical photoinhibition and simultaneous photoinactivation of microbially mediated metal redox reactions linked to cathodic kinetics. These data offer fresh insights into the behaviour of SS under practical seawater situations and the proposed potential use of illumination in the mitigation of biologically influenced consequences.

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Section: Introductionmentioning

confidence: 99%

The influence of sunlight on the localized corrosion of UNS S31600 in natural seawater

et al. 2011

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“…This concept has been applied to austenitic stainless steel and related (e.g. Ni-base) alloys [13][14][15].…”

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confidence: 99%

Properties of the Passive Film Formed on Interstitially Hardened AISI 316L Stainless Steel

Niu

Lillard

et al. 2015

Electrochimica Acta

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The passive-film on interstitially hardened AISI 316L stainless steel was studied in 0.1 M NaCl solution using electrochemical impedance spectrometry (EIS) and surface analytical techniques.The interstitially hardened AISI 316L was achieved via low-temperature paraequilibrium carburization. EIS experimental data were fitted and analyzed by an equivalent-circuit model that incorporated two time constants: one representing the properties of the carburized layer and one representing those of the passive film. To validate the model a series of samples with varying carburized layer thickness were prepared by successive polishing. In addition to EIS, these samples were analyzed by XPS (X-ray photoelectron spectrometry) to determine the chemical composition of the passive film and carburized layer. A consistent correlation was observed between the EIS response and the chemical compositions of the passive film and carburized layers. Supporting data from long term immersion tests are also reported.K ey wor ds: Austenitic stainless steel, AISI 316L, interstitial hardening, surface engineering passivity, electrochemical impedance spectrometry, X-ray photoelectron spectrometry. * Corresponding author: lillard@uakron.edu 1. I ntr oductionSurface hardening (or, more general, surface engineering) of alloys has been a central theme of materials technology. For stainless steel and related alloys, interstitial hardening via a lowtemperature gas carburizing process has been developed by Heurer and Ernst [1][2][3][4][5][6][7]. The process is based on infusing carbon through the alloy surface at low temperature -a temperature low enough to kinetically suppress carbide precipitation but still high enough to enable carbon diffusion into technologically useful depths (>25 m) within acceptable processing times (90 ks) [1,2]. Without changing the shape or dimensions of alloy parts, the process produces a graded carbon concentration-depth profile from the alloy surface into the part. In austenitic stainless steel AISI 316, for which the process has been developed originally, peak fractions of up to 14 at% of carbon in solid solution are observed near the surface. This corresponds to 10 5 times the roomtemperature equilibrium solubility limit of carbon. The dissolved carbon stabilizes the FCC (face-centered cubic) crystal structure of austenite and lowers the martensite start temperature. The carburized layer dramatically improves hardness ( 5 times), wear resistance ( 100 times), and high-cycle fatigue life ( 100 times). For example, surface Vickers hardness values of 1200 HV25 have been obtained for base material with a Vickers hardness of 250 HV25 [3]. The substantial enhancement of high-cycle fatigue life has also been observed and is the result of a compressive biaxial stress of 2 to 3 GPa that the high concentration of interstitial carbon generates near the alloy surface [3]. With respect to corrosion resistance, it has been reported that interstitial hardening (IH) with low-temperature paraequilibrium carburization significantly imp...

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“…In the circuits, R s is the solution resistance; R f is the resistance of passive film; W is the Warburg impedance; and Q f represents the passive film capacitance. The presence of Warburg impedance in a passive system was commonly believed to be related to the vacancy migration under the electric field across the passive film [24], which has been widely reported in the investigations on austenitic stainless steels [24][25][26][27]. The presence of Warburg impedance indicated that the corrosion process of 316L was controlled not only by a charge transfer process but also by a diffusion control process.…”

Section: Eis Resultsmentioning

confidence: 90%

Comparison Study on the Semiconductive and Dissolution Behaviour of 316L and Alloy 625 in Hydrochloric Acid Solution

Wang

Zhang

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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The corrosion behaviour of 316L and Alloy 625 was investigated using cyclic polarization, electrochemical impedance spectroscopy, X-ray photoelectron spectroscopy, Auger electron spectroscopy and induced coupled plasma-optical emission spectrometer. The results indicated that Alloy 625 showed better corrosion resistance than 316L and the prolonging immersion time could enhance corrosion resistance of the two alloys. The passive film formed on the surface of 316L exhibited an electronic structure of p-p heterojunction, with Fe 3 O 4 and Cr 2 O 3 enriched in the outer and inner layers, respectively. However, Alloy 625 presented the electronic structure of n-p heterojunction dominated by the outer Fe 2 O 3 /NiFe 2 O 4 and inner Cr 2 O 3 . This resulted in the opposite semiconductive properties of the passive films formed on the two materials. In the acid solutions, Fe and Mo suffered from selective dissolution while Cr and Ni were relatively stable. The corrosion rates were mainly dominated by the dissolution of iron. Alloy 625 presented better corrosion resistance than 316L due to the obviously lower content of Fe and the higher content of Cr and Ni in the passive film. The continuously selective dissolution of iron resulted in the increase in Cr/Fe ratio in the passive film, which was responsible for the enhancement in corrosion resistance.

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The Inhibition of Pitting Corrosion in Stainless Steel 304 L During Proton Irradiation

Cited by 8 publications

References 22 publications

The influence of sunlight on the localized corrosion of UNS S31600 in natural seawater

The influence of sunlight on the localized corrosion of UNS S31600 in natural seawater

Properties of the Passive Film Formed on Interstitially Hardened AISI 316L Stainless Steel

Comparison Study on the Semiconductive and Dissolution Behaviour of 316L and Alloy 625 in Hydrochloric Acid Solution

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