Electrochemical Obtaining and Corrosion Behavior of Zinc-Polyaniline (Zn-PANI) Hybrid Coatings

Hybrid zinc-based coatings with embedded polyaniline (PANI) particles in the metal matrix are obtained in a one-step process via electrodeposition on low-carbon steel plates. The aim is directly to use the inhibitor properties of polyaniline for improved protection against corrosion in chloride containing medium (5% NaCl solution). PANI-particles (concentration of 0.025 g/L) are added to the starting zinc electrolyte in dispersed form—the latter being obtained via oxidation polymerization in the presence of stabilizers (polyvinyl pyrrolidone (PVP) or colloidal SiO2). Electrodeposition conditions are equal to those for obtaining an ordinary zinc coating. The surface morphology of the hybrid coatings before and after corrosion treatment in the model medium is characterized with SEM. The influence of the incorporated PANI/PVP- or PANI/SiO2-particles on the protective properties of the coatings is evaluated by the application of electrochemical (potentiodynamic polarization, open-circuit potential, polarization resistance, cyclic voltammetry) as well as X-ray based (X-ray diffraction and X-ray photoelectron spectroscopy) methods. A discussion and some conclusions about the reasons for the improved corrosion resistance and protective ability of the hybrid coatings in that model medium are proposed.

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Corrosion Inhibition of Low-Carbon Steel by Hydrophobic Organosilicon Dispersions

Metals ◽

10.3390/met11081269 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1269

Author(s):

Yuri Makarychev ◽

Natalia Gladkikh ◽

Ivan Arkhipushkin ◽

Yuri Kuznetsov

Keyword(s):

Carbon Steel ◽

Corrosion Inhibitor ◽

Photoelectron Spectroscopy ◽

Corrosion Inhibitors ◽

Low Carbon Steel ◽

Low Carbon ◽

X Ray ◽

Micelle Core ◽

Hydrophobic Solvent ◽

Polymer Type

This article proposes a method for obtaining stable hydrophobic inhibitor dispersions, where the micelle core contains a hydrophobic solvent, a corrosion inhibitor and an organosilane. Such compositions can be used as polymer-type corrosion inhibitors for low-carbon steel. Using electrochemical methods, corrosion tests and X-ray photoelectron spectroscopy, features of the formation of polymeric layers of hydrophobic organosilicon dispersions were studied.

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Sputter Deposition and Thermally Induced Phase Transformation of Non-BCC Chromium Thin Films

MRS Proceedings ◽

10.1557/proc-311-361 ◽

1993 ◽

Vol 311 ◽

Author(s):

M. J. O'Keefe ◽

S. Horiuchi ◽

J.J. Chu ◽

J.J. Rigsbee

Keyword(s):

Crystal Structure ◽

Thin Films ◽

Photoelectron Spectroscopy ◽

Low Carbon Steel ◽

Substrate Material ◽

Low Carbon ◽

Thermally Induced ◽

X Ray ◽

Sputter Deposited ◽

Cr Film

ABSTRACTThe crystal structure of sputter deposited chromium thin films on Coming 7059 glass, polytetrafluoroethylene, and cold rolled (110) oriented low carbon steel α-Fe substrates was investigated as a function of O and C incorporation into the growing Cr film. The as-deposited crystal structure of the films was found by X-ray diffraction to be either highly oriented (110) BCC α-Cr or (200) oriented A-15 δ-Cr. Chemical analysis of the films by Auger electron spectroscopy determined that the δ-Cr phaseformed when the combined O and C impurity concentration in the film was ∼15-30 at.%. At total impurity concentrations above ∼30 at.% or below ∼10 at.% standard BCC α-Cr formed. The crystal structure of the films was not influenced by the substrate material. X-ray photoelectron spectroscopy of the Cr 2pl/2-2p3/2 orbitals indicated that the dominate binding state of both the BCC α-Cr and A-15 δ-Cr films was characteristic of elemental Cr. Vacuum annealing of the A-15 δ-Cr films at 500º for one hour transformed the crystal structure into BCC α-Cr without a measurable change in chemical composition. The incorporation of O and C into the growing Cr film is believed to impurity stabilize the A-15 structure and favor its formation over the BCC structure.

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Effect of 6-Aminohexanoic Acid Released from Its Aluminum Tri-Polyphosphate Intercalate (ATP-6-AHA) on the Corrosion Protection Mechanism of Steel in 3.5% Sodium Chloride Solution

Corrosion and Materials Degradation ◽

10.3390/cmd2040036 ◽

2021 ◽

Vol 2 (4) ◽

pp. 666-677

Author(s):

Chaymae Hejjaj ◽

Ahmed Ait Aghzzaf ◽

Nico Scharnagl ◽

Mohammed Makha ◽

Mouad Dahbi ◽

...

Keyword(s):

Sodium Chloride ◽

Carbon Steel ◽

Photoelectron Spectroscopy ◽

Surface Characterization ◽

Steel Surface ◽

Electrochemical Impedance ◽

Low Carbon Steel ◽

Protective Layer ◽

Low Carbon ◽

X Ray

A new corrosion inhibitor called ATP-6-AHA was elaborated, and its inhibition action on S235 low carbon steel in 3.5% sodium chloride (NaCl) was investigated using gravimetry, potentiodynamic polarization (PP), and electrochemical impedance spectroscopy (EIS). The release of ecofriendly 6-aminohexanoic acid (6-AHA) from its established aluminum tri-polyphosphate intercalate (ATP-6-AHA) is investigated using electrochemical and surface characterization techniques such as X-ray diffraction (XRD) and X-ray fluorescence (XRF). The results revealed that ATP-6-AHA is a good inhibitor, with an inhibition efficiency of approximately 70%. The efficiency is related to the passivation of a steel surface by a phosphate protective layer due to the synergistic effect of 6-AHA, as confirmed by a steel surface analysis conducted using X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). This study suggests that the intercalation of 6-AHA as a sustainable organic molecule within the interlayer spaces of aluminum tri-polyphosphate can well serve as a good flaky inhibitor for protecting S235 low-carbon steel from corrosion in 3.5% NaCl.

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MICROSTRUCTURE AND PROPERTIES OF THE Ni–B AND Ni–B–Ce ULTRASONIC-ASSISTED ELECTROLESS COATINGS

Surface Review and Letters ◽

10.1142/s0218625x19500069 ◽

2018 ◽

Vol 25 (06) ◽

pp. 1950006 ◽

Cited By ~ 4

Author(s):

WEI QIAN ◽

HAOTIAN CHEN ◽

CHENQI FENG ◽

LIYING ZHU ◽

HUANMING WEI ◽

...

Keyword(s):

Corrosion Resistance ◽

Photoelectron Spectroscopy ◽

Inductively Coupled Plasma ◽

Electrochemical Impedance ◽

Low Carbon Steel ◽

Amorphous Structure ◽

Low Carbon ◽

X Ray ◽

Inductively Coupled ◽

Hardness Tester

We successfully obtained Ni–B and Ni–B–Ce coatings with and without sonication on low-carbon steel (Q235) through electroless plating with the deposition time of 60[Formula: see text]min. The surface morphology and elemental composition of the coatings were evaluated by scanning electron microscopy (SEM) and inductively coupled plasma (ICP). The 11[Formula: see text][Formula: see text]m thick sonicated Ni–B–Ce (Son-Ni–B–Ce) coating is uniform with the composition of Ni 87.1%, B 6.2% and Ce 6.6%. X-ray diffraction (XRD) measurements implied a typical broaden peak around 44∘, considered as amorphous structure which was confirmed by selected area electron diffraction pattern (SAED). Atomic force microscopy (AFM) showed a typical circular pit of Ni–B–Ce coating and Son-Ni–B–Ce coating. X-ray photoelectron spectroscopy (XPS) revealed the chemical status of coating components. The mechanical and corrosion resistance properties were determined by Vickers hardness tester, potentiodynamic polarization (Tafel) and electrochemical impedance spectroscopy (EIS) in 3.5[Formula: see text]wt. % NaCl solution. As a result, the Son-Ni–B–Ce coating revealed the optimum hardness (956[Formula: see text]HV), minimum roughness [Formula: see text] (92.38[Formula: see text]nm) and excellent corrosion resistance (3.65[Formula: see text][Formula: see text]Acm[Formula: see text] among all coatings.

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Acoustic and X-ray Diffraction Texture Parameters and the Elastic Constants of Low-Carbon Steel before and after Fatigue Tests

Russian Metallurgy (Metally) ◽

10.1134/s0036029520100225 ◽

2020 ◽

Vol 2020 (10) ◽

pp. 1142-1146

Author(s):

V. N. Serebryanyi ◽

V. V. Mishakin ◽

A. V. Gonchar

Keyword(s):

Carbon Steel ◽

Elastic Constants ◽

Low Carbon Steel ◽

Fatigue Tests ◽

Low Carbon ◽

X Ray Diffraction ◽

X Ray ◽

Texture Parameters ◽

Before And After

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Effect of Welding Parameters on the Weld Bead Profile of Submerged Arc Welded Low Carbon Steel Plates

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1126/1/012022 ◽

2021 ◽

Vol 1126 (1) ◽

pp. 012022

Author(s):

Charu Singh Chaudhary ◽

Kashish ◽

Pradeep Khanna

Keyword(s):

Carbon Steel ◽

Low Carbon Steel ◽

Weld Bead ◽

Steel Plates ◽

Welding Parameters ◽

Low Carbon ◽

Submerged Arc ◽

Bead Profile

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Synthesis of Novel Arginine-Based Flame Retardant and Its Application in Lyocell Fabric

Molecules ◽

10.3390/molecules26123588 ◽

2021 ◽

Vol 26 (12) ◽

pp. 3588

Author(s):

Jiayi Chen ◽

Yansong Liu ◽

Jiayue Zhang ◽

Yuanlin Ren ◽

Xiaohui Liu

Keyword(s):

Fourier Transform ◽

Heat Release ◽

Flame Retardant ◽

Photoelectron Spectroscopy ◽

Fourier Transform Infrared ◽

Ftir Analysis ◽

Excellent Thermal Stability ◽

X Ray ◽

Cone Calorimeter Test ◽

Before And After

Lyocell fabrics are widely applied in textiles, however, its high flammability increases the risk of fire. Therefore, to resolve the issue, a novel biomass-based flame retardant with phosphorus and nitrogen elements was designed and synthesized by the reaction of arginine with phosphoric acid and urea. It was then grafted onto the lyocell fabric by a dip-dry-cure technique to prepare durable flame-retardant lyocell fabric (FR-lyocell). X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) analysis demonstrated that the flame retardant was successfully introduced into the lyocell sample. Thermogravimetric (TG) and Raman analyses confirmed that the modified lyocell fabric featured excellent thermal stability and significantly increased char residue. Vertical combustion results indicated that FR-lyocell before and after washing formed a complete and dense char layer. Thermogravimetric Fourier-transform infrared (TG-FTIR) analysis suggested that incombustible substances (such as H2O and CO2) were produced and played a significant fire retarding role in the gas phase. The cone calorimeter test corroborated that the peak of heat release rate (PHRR) and total heat release (THR) declined by 89.4% and 56.4%, respectively. These results indicated that the flame retardancy of the lyocell fabric was observably ameliorated.

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