An XPS study of the passive and transpassive behavior of molybdenum in deaerated 0.1 M HCl

Lu, Yuning; Clayton, Clive R.

doi:10.1016/0010-938x(89)90085-1

Cited by 104 publications

(59 citation statements)

References 9 publications

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“…Figure 2s hows XPS spectra of the Mo 3d 5/2 and 3d 3/2 bands of Pt/MoO 3 -C and Pt/MoO 2 *-C. The results were analyzedb y considering the oxidation states Mo 6 + ,M o 5 + ,a nd Mo 4 + . According to the literature, [20,21] if any Mo speciesc ontains the metallicf orm (Mo 0 ), the 3d 5/2 peak would be at 227.7 eV,w hich clearly is not the case for the materials studied here. Ta ble 2 compiles the atomicp ercentages of each Mo n + species and the bindinge nergies of the bands in each oxidation state for Pt/MoO 3 -C and Pt/MoO 2 *-C. These resultss how that the binding energies obtained here are identicalt ot he standard values.…”

Section: Resultsmentioning

confidence: 91%

“…Ta ble 2 compiles the atomicp ercentages of each Mo n + species and the bindinge nergies of the bands in each oxidation state for Pt/MoO 3 -C and Pt/MoO 2 *-C. These resultss how that the binding energies obtained here are identicalt ot he standard values. [20][21][22][23] species, which were not detected in the XRD analysisd ue to the high intensities of the Pt diffraction peaks. In any case, the presenceo fo xidized Mo speciesi nt his system is consistent with the EDX and XPS results.…”

Section: Resultsmentioning

confidence: 99%

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Electrocatalytic Activity and Stability of Platinum Nanoparticles Supported on Carbon–Molybdenum Oxides for the Oxygen Reduction Reaction

Martins

Ticianelli

2015

ChemElectroChem

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Leucosceptroids A and B are sesterterpenoids with potent antifeedant and antifungal activities. A more efficient gram‐scale total synthesis of leucosceptroid B and the first total synthesis of leucosceptroid A are presented. The key transformations include an aldol reaction between a substituted dihydrofuranone and an (S)‐citronellal‐derived aldehyde, a SmI2‐mediated intramolecular ketyl–olefin radical cyclization, and final‐stage alcohol oxidation.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Electrocatalytic Activity and Stability of Platinum Nanoparticles Supported on Carbon–Molybdenum Oxides for the Oxygen Reduction Reaction

Martins

Ticianelli

2015

ChemElectroChem

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“…The oxidation states of pure Mo have been investigated in detail by Brox and Olefjord 11 as well as Lu and Clayton. 12 The fit parameters used in this paper are given in Table 2. The curve fits for two different polarizations (0.24 and 1.04 V SHE ) and three analysis angles (20°, 45°and 80°) with respect to the sample surface are shown in Fig.…”

Section: Molybdenummentioning

confidence: 99%

Angle‐resolved XPS analysis of molybdenum and tungsten in passive films on stainless steel PVD alloys

Olsson

Mathieu

Landolt

2002

Surface & Interface Analysis

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Passive films on physical vapour deposited alloys, based on 304L with additions of 20 at.% of molybdenum and tungsten, were studied with angle-resolved XPS. The samples were anodically polarized in a sulphate solution to potentials in the low and high passive region, respectively. In the low passive region, the Mo spectrum contained a strong contribution of Mo(IV) hydroxide. In the high passive region, higher fractions of hexavalent species were found; W(VI) gave a stronger contribution than Mo(VI), as can be understood by the lower solubility of the W(VI) salts. Contributions to tetravalent molybdenum were found to consist of oxide (MoO 2 ) as well as oxyhydroxide compounds. For tungsten, the dominating tetravalent contribution was WO 2 .

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“…Although there are several studies about the electrochemical behavior of Mo and its role to increase the corrosion resistance properties of the SS, the presence of this element in the passive film and its influence on the pitting corrosion mechanism is not clearly understood (Halada et al, 1995). However, several works with pure Mo were done in order to understand its influence on the corrosion resistance mechanism of SS (Halada et al, 1995;Badawy et al, 1998;Yang et al, 1984;Ürgen et al, 1990;Lu et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

Influence of Mo alloying on pitting corrosion of stainless steels used as concrete reinforcement

Mesquita¹,

Chauveau²,

Mantel³

et al. 2013

Rem: Rev. Esc. Minas

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Corrosion of reinforcement steels, induced by chloride ions penetrating into the concrete, is the main cause of early damage, loss of serviceability and safety of reinforced concrete structures, which can be even more severe in the presence of concomitant concrete carbonation. In order to prevent reinforcement steel corrosion in highly aggressive alkaline environments, the use of stainless steels is becoming increasingly popular in coastal and marine constructions. Although widely used as an increasing corrosion resistance element in acidic environments, the influence of Mo addition on pitting corrosion resistance of stainless steels is not very clear in these conditions. Understanding Mo mechanism on corrosion resistance in alkaline media is hence of major importance, particularly for new lean grades with low Nickel and Molybdenum contents which presents a good balance between the properties required in these applications and the final cost of the material. In this work we will show the effect of Mo addition on pitting corrosion properties of austenitic, ferritic and duplex SS. A comparison between Mo content steels (alloys: 1.4404, 1.4113 and 1.4462) and very low molybdenum contents steels (alloys: 1.4301, 1.4016 and 1.4362) is done considering their pitting corrosion resistance (pitting potential E pit ) in different corrosion conditions. The results are discussed with respect to the influence of Mo addition on pitting behaviors for the different stainless steel rebar families in several aggressive media mainly in synthetic, chlorinated and carbonated solution reproducing the real concrete pore environments (pH10 solution with carbonates and chlorides ions). Keywords

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An XPS study of the passive and transpassive behavior of molybdenum in deaerated 0.1 M HCl

Cited by 104 publications

References 9 publications

Electrocatalytic Activity and Stability of Platinum Nanoparticles Supported on Carbon–Molybdenum Oxides for the Oxygen Reduction Reaction

Electrocatalytic Activity and Stability of Platinum Nanoparticles Supported on Carbon–Molybdenum Oxides for the Oxygen Reduction Reaction

Angle‐resolved XPS analysis of molybdenum and tungsten in passive films on stainless steel PVD alloys

Influence of Mo alloying on pitting corrosion of stainless steels used as concrete reinforcement

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