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Related Concept Videos

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.
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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
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  9. Wearable Materials
  11. Oxidation And Corrosion Evaluation Of Β‑nial Coatings Deposited Onto Pure Nickel And Superalloy Substrates.
  1. Home
  3. Research Domains
  5. Engineering
  7. Materials Engineering
  9. Wearable Materials
  11. Oxidation And Corrosion Evaluation Of Β‑nial Coatings Deposited Onto Pure Nickel And Superalloy Substrates.

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Oxidation and Corrosion Evaluation of β‑NiAl Coatings Deposited onto Pure Nickel and Superalloy Substrates.

Jahanzeb Bhatti1, Ali Dad Chandio1

  • 1Advanced Materials & Sustainable Environment Research Group, Department of Metallurgical Engineering, NED University of Engineering & Technology, Karachi 75270, Sindh, Pakistan.

ACS Omega
|September 8, 2025

View abstract on PubMed

Summary
This summary is machine-generated.

This study investigated beta-NiAl coatings for protecting engine turbine blades. While these coatings enhance oxidation resistance, their impact on corrosion performance varies with the substrate material.

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Area of Science:

  • Materials Science
  • Surface Engineering
  • High-Temperature Coatings

Background:

  • Thermal barrier coatings (TBCs) are vital for aeroengine turbine blade protection in extreme heat.
  • The bond coat is critical for adhering ceramic topcoats to superalloys within TBC systems.

Purpose of the Study:

  • To evaluate the corrosion and oxidation behavior of beta-NiAl coatings on pure nickel and CMSX-4 superalloy substrates.
  • To compare the performance of coated substrates against uncoated ones.

Main Methods:

  • High-activity pack aluminizing was used to create beta-NiAl coatings.
  • Electrochemical tests assessed corrosion resistance.
  • Oxidation tests were conducted at 1150°C for 50 hours in open air.

Main Results:

  • Beta-NiAl coatings improved oxidation resistance for both substrate types compared to uncoated samples.
  • Pure nickel substrates showed higher corrosion rates, even with beta-NiAl coatings, than CMSX-4 superalloys.
  • CMSX-4 superalloys demonstrated superior oxidation resistance over pure nickel, with or without coatings.

Conclusions:

  • Beta-NiAl coatings generally enhance oxidation resistance in high-temperature environments.
  • The substrate material significantly influences the corrosion performance of beta-NiAl coatings, potentially compromising it in some cases.