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Corrosion Behavior

46 Статьи

High Temperature Corrosion: Part One

High-temperature corrosion is a form of corrosion that does not require the presence of a liquid electrolyte.
Strictly speaking, high-temperature oxidation is only one type of high-temperature corrosion, but it is the most important high-temperature corrosion reaction.

High Temperature Nickels: Part Two

Nickel-based superalloys typically constitute 40–50% of the total weight of an aircraft engine and are used most extensively in the combustor and turbine sections of the engine where elevated temperatures are maintained during operation.
Because grain boundaries are sites for damage accumulation at high temperatures, the blades in the early stages of the turbine are typically single crystals, whereas the blades in the later (cooler) stages of the turbine are fabricated from equiaxed alloys.

High-Alloy Cast Steels

Cast high alloy steels are widely used for their corrosion resistance in aqueous media at or near room temperature and for service in hot gases and liquids at elevated and high temperatures (> 650°C). High-alloy cast steels are most often specified on the basis of composition using the designation system, which has been replaced by the Alloy Casting Institute (ACI), which formerly administered these designations.

High-Temperature Corrosion: Part Two

Vapor species that form in any given high-temperature corrosion situation often have a strong influence on the rate of attack, the rate generally being accelerated when volatile corrosion products form.
Although most metals and alloys form a layer of oxide in contact with air, the differences in oxide growth rate can be significant.

Hydrogen Sulfide Corrosion

Hydrogen sulfide (H₂S) corrosion presents significant challenges in industrial processes, particularly in oil and gas operations. This article examines the electrochemical mechanisms of H₂S corrosion on mild steel, focusing on the formation of various iron sulfide scales and their impact on material degradation.

Martensitic Stainless Steels

Martensitic stainless steels represent a unique class of ferromagnetic materials that combine the structural properties of low alloy steels with enhanced hardening capabilities through heat treatment. These steels, primarily composed of 12-15% chromium with varying carbon content (0.1-1.2%), offer a distinctive balance of strength, hardness, and moderate corrosion resistance. This comprehensive review examines their metallurgical characteristics, heat treatment processes, and performance attributes.