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Related Concept Videos

Corrosion02:49

Corrosion

25.0K
The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
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Corrosion of Reinforcement01:27

Corrosion of Reinforcement

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The corrosion of steel reinforcement within concrete is a process influenced by the material's inherent properties and external factors. The high pH level of around 13, provided by calcium hydroxide present in concrete, initially protects the steel reinforcement by promoting the formation of a passive iron oxide layer on its surface.
However, over time and under certain conditions like carbonation, chloride ingress, and cracking this protective state can be compromised. Steel has areas with...
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Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents01:13

Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents

4.6K
Carboxylic acids can be prepared by the carboxylation of Grignard reagents (RMgX). This method is convenient for converting alkyl (primary, secondary or tertiary), vinyl, benzyl, and aryl halides to carboxylic acids with one additional carbon than the starting RMgX.
4.6K
Carbocations02:10

Carbocations

11.3K
Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
11.3K
Reactions of Carboxylic Acids: Introduction01:41

Reactions of Carboxylic Acids: Introduction

3.1K
Carboxylic acids possess an acidic –COOH functional group. The acidity can be attributed to the resonance stabilization of their conjugate base, wherein the negative charge is delocalized over both oxygen atoms.
3.1K
Loss of Carboxy Group as CO2: Decarboxylation of β-Ketoacids01:02

Loss of Carboxy Group as CO2: Decarboxylation of β-Ketoacids

3.2K
Carboxylic acids, upon heating, undergo a decarboxylation reaction by releasing carbon dioxide gas. Monocarboxylic acids do not undergo decarboxylation easily. However, a silver salt of carboxylic acid reacts with bromine or iodine under high temperature to release carbon dioxide gas and forms halide with one less carbon. This reaction is called the Hunsdiecker reaction.
3.2K

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The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight
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Q-Carbon as a Corrosion-Resistant Coating.

Subrata Karmakar1, Maria Sultana1, Ariful Haque1,2

  • 1Electrical Engineering, Ingram School of Engineering, Texas State University, San Marcos, Texas 78666, United States.

ACS Applied Materials & Interfaces
|September 25, 2023
PubMed
Summary

Newly synthesized Q-carbon thin films exhibit excellent corrosion resistance due to their unique sp3-rich structure. These advanced carbon materials show promising durability in various corrosive environments, offering a superior alternative to conventional materials.

Keywords:
Nyquist plotQ-carbonTafel equationcorrosion-resistant propertiesgrowth mechanism

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Determining Tribocorrosion Rate and Wear-Corrosion Synergy of Bulk and Thin Film Aluminum Alloys
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Q-carbon, a novel quenched form of carbon, possesses unique microstructural properties.
  • Understanding its corrosion resistance is crucial for advanced material applications.
  • Existing corrosion-resistant materials often have limitations in performance and durability.

Purpose of the Study:

  • To synthesize Q-carbon thin films using pulsed laser annealing.
  • To investigate the corrosion-resistant properties of Q-carbon thin films.
  • To evaluate the durability and performance of Q-carbon in various corrosive media.

Main Methods:

  • Synthesis of Q-carbon thin films via nanosecond pulsed laser annealing.
  • Potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) for corrosion analysis.
  • Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) for material characterization.

Main Results:

  • Q-carbon films exhibit high sp3 content (∼80.5%) and desirable defect structures.
  • Corrosion potential, current, and rate were determined in Na2SO4 solutions.
  • Excellent corrosion resistance and durability were observed, with minimal degradation up to 48 hours.

Conclusions:

  • Q-carbon thin films demonstrate superior corrosion resistance compared to existing materials.
  • The unique sp2-sp3 ratio, compact structure, and high adhesion contribute to its anti-corrosion performance.
  • Q-carbon is a promising material for applications requiring high corrosion resistance.