Corrosion products of zinc-manganese coatings: Part II—Investigations using X-ray photoelectron spectroscopy (XPS)

: The effect of Si content (0.12%, 0.34%, and 0.48%) on the corrosion behavior of weathering steel in a simulated marine environment was investigated in a dry/wet alternating cycle corrosion experiment. Corrosion weight gain, X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and electrochemical methods were used to measure the regularity and nature of the rust. The results show that the corrosion process could be divided into an initial stage where the corrosion rate increased and a later stage where the corrosion rate decreased before remaining stable. The corrosion rate was the lowest for a Si content in the weathering steel of 0.48%. The corrosion products of all three steel groups contains α-FeOOH, β-FeOOH, γ-FeOOH, Fe3O4, and large amounts of amorphous compounds. Furthermore, Si benefits the transformation of β-FeOOH and γ-FeOOH to stable phases. The addition of the Si alloying element is beneficial to the formation of dense and compact rust layers that enhance the electrochemical resistance of weathering steel and silicon oxide influences the self-corrosion potential of the corrosion products.

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Some Boiler Tubes Crack Reason Analysis

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.405-408.3253 ◽

2013 ◽

Vol 405-408 ◽

pp. 3253-3258 ◽

Cited By ~ 1

Author(s):

Ling Pan ◽

Xue Jun Xie ◽

Jun Shen ◽

Zhao Li ◽

Rui Wang ◽

...

Keyword(s):

High Temperature ◽

Power Plant ◽

Photoelectron Spectroscopy ◽

Element Composition ◽

Corrosion Products ◽

Back Side ◽

X Ray ◽

Boiler Tubes ◽

Scanning Electron

Aiming at some boiler tubescrack in a power plant, the element composition and the valence of elements in corrosion products on the outer surfaces of the boiler tubes were analysed by Scanning Electron Microanalyzer (SEM) and X-ray Photoelectron Spectroscopy (XPS), and the corrosion reason and mechanism of the outer surfaces of the boiler tubes were studied.The results showed as follows. (1)The content of element S in the corrosion products on the outer surfaces of the fire side boiler tubes was bigger than that in the corrosion products on the outer surfaces of the back side boiler tubes and the corrosion of the outer surfaces of the fire side boiler tubes was more serious than that of the outer surfaces of the back side boiler tubes. (2) the element S in the corrosion products existed in the form of sulfate (SO42-), because the valence of S in the corrosion products on the outer surfaces of the fire side boiler tubes and the back side boiler tubes was +6, not-2. (3) the element Fe in the corrosion products on the outer surfaces of the fire side boiler tubes and the back side boiler tubes existed in the form of Fe3O4, Fe2O3 or Fe2(SO4)3. (4) The corrosion of the boiler tubes was induced by sulphate under high temperature, and aggravated with the temperature of the outer surfaces of the boiler tubes elevated.

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XPS and FT-IR Characterization of Selected Synthetic Corrosion Products of Zinc Expected in Neutral Environment Containing Chloride Ions

Journal of Spectroscopy ◽

10.1155/2018/2079278 ◽

2018 ◽

Vol 2018 ◽

pp. 1-14 ◽

Cited By ~ 25

Author(s):

Juliusz Winiarski ◽

Włodzimierz Tylus ◽

Katarzyna Winiarska ◽

Irena Szczygieł ◽

Bogdan Szczygieł

Keyword(s):

Photoelectron Spectroscopy ◽

Surface Composition ◽

Chloride Ions ◽

Corrosion Products ◽

Zinc Alloy ◽

Solid State Method ◽

X Ray ◽

Ft Ir ◽

Atr Spectroscopy

ZnO, Zn(OH)2, Zn5(OH)8Cl2·H2O, ZnCO3, and Zn5(CO3)2(OH)6 synthetic powders were prepared by chemical or solid-state method. Their crystalline phase structure, thermal behavior, and morphology were examined. Characteristic infrared absorbance bands were estimated by means of FT-IR ATR spectroscopy. X-ray photoelectron spectroscopy (XPS) allowed to calculate the modified Auger parameters (α ′) thereof to 2010.2, 2009.3, 2009.4, 2009.7, and 2009.8 eV, respectively for ZnO, Zn(OH)2, Zn5(OH)8Cl2·H2O, ZnCO3, and Zn5(CO3)2(OH)6. Finally, comparison of surface composition may be crucial to evaluation of the unknown experimental spectra of corrosion products formed on the surface of zinc alloy coatings exposed in NaCl solution.

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The Influence of Rapid Solidification on Corrosion Behavior of Mg60Zn20Yb15.7Ca2.6Sr1.7 Alloy for Medical Applications

Materials ◽

10.3390/ma14195703 ◽

2021 ◽

Vol 14 (19) ◽

pp. 5703

Author(s):

Katarzyna Młynarek-Żak ◽

Anna Sypien ◽

Tomasz Czeppe ◽

Anna Bajorek ◽

Aneta Kania ◽

...

Keyword(s):

Corrosion Resistance ◽

Cooling Rate ◽

Corrosion Behavior ◽

Photoelectron Spectroscopy ◽

Open Circuit ◽

Corrosion Products ◽

Medical Applications ◽

Scanning Calorimetry ◽

X Ray ◽

The Impact

Biodegradable magnesium alloys with Zn, Yb, Ca and Sr additions are potential materials with increased corrosion resistance in physiological fluids that ensure a controlled resorption process in the human body. This article presents the influence of the use of a high cooling rate on the corrosion behavior of Mg60Zn20Yb15.7Ca2.6Sr1.7 alloy proposed for medical applications. The microstructure of the alloy in a form of high-pressure die-casted plates was presented using scanning electron microscopy in the backscattered electrons (BSEs) mode with energy-dispersive X-ray spectrometer (EDX) qualitative analysis of chemical composition. The crystallization mechanism and thermal properties were described on the basis of differential scanning calorimetry (DSC) results. The corrosion behavior of Mg60Zn20Yb15.7Ca2.6Sr1.7 alloy was analyzed by electrochemical studies with open circuit potential (EOCP) measurements and polarization tests. Moreover, light microscopy and X-ray photoelectron spectroscopy were used to characterize the corrosion products formed on the surface of studied samples. On the basis of the results, the influence of the cooling rate on the improvement in the corrosion resistance was proved. The presented studies are novel and important from the point of view of the impact of the technology of biodegradable materials on corrosion products that come into direct contact with the tissue environment.

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Surface Spectroscopic Analysis of HCN/NH3 Corrosion Products on Iron by Fourier Transform Infrared Photoacoustic Spectroscopy and X-ray Photoelectron Spectroscopy

Applied Spectroscopy ◽

10.1366/0003702824639358 ◽

1982 ◽

Vol 36 (5) ◽

pp. 570-573 ◽

Cited By ~ 15

Author(s):

Joseph A. Gardella ◽

Edward M. Eyring ◽

Joseph C. Klein ◽

Manuel B. Carvalho

Keyword(s):

Photoacoustic Spectroscopy ◽

Photoelectron Spectroscopy ◽

Structural Information ◽

Corrosion Products ◽

X Ray ◽

Surface Iron ◽

Relative Quantitation ◽

Ft Ir ◽

Infrared Photoacoustic Spectroscopy ◽

Dark Blue

Surface analysis of the corrosion products formed on iron metal exposed to off gas from a HCN production process has been performed. The atmosphere contains HCN(g), NH3(g), and H2O(g) plus other trace gases. Iron gratings exposed to the atmosphere form a dark blue coating which pits the surface of the iron. Samples of the corroded iron surface were analyzed by FT-IR/photoacoustic spectroscopy (PAS) and x-ray photoelectron spectroscopy (XPS or ESCA). The mid-IR spectrum from PAS yielded peaks due to NH4+, CN−, and H2O. ESCA analysis confirmed that the surface iron was divalent, coordinated to cyanide, and no iron(II) oxide was present. Relative quantitation from ESCA showed a 1:4 ratio of NH4/CN type nitrogen, thus a specific single stoichiometry was not postulated for the corrosion product. Peak positions of the cyanide stretching frequencies suggest a mixed ferro(ferrocyanide) complex, with some ammonium as a counterion. This study illustrates the detailed structural information obtainable from FT-IR/PAS with ESCA and the applicability of FT-IR/PAS to corrosion problems.

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