High temperature corrosion and corrosion inhibitors

2022 ◽  
pp. 255-260
Author(s):  
Chandrabhan Verma
Keyword(s):  
High Temperature ◽  
Corrosion Inhibitors ◽  
High Temperature Corrosion

High-temperature corrosion of steels in acid solutions. Part 2. Inhibitor protection of steels by unsaturated organic compounds. Review

2020 ◽  
pp. 1-19
Author(s):  
Ya.G. Avdeev ◽  
◽  
Yu.I. Kuznetsov ◽  
Keyword(s):  
High Temperature ◽  
Organic Compounds ◽  
Corrosion Inhibitors ◽  
High Temperature Corrosion ◽  
Chemical Transformations ◽  
Acid Solutions ◽  
Slowing Down ◽  
Mineral Acids ◽  
Protective Polymer ◽  
Unique Mechanism

The general regularities of the influence of temperature (t) of acid solutions on the protection effectiveness of steel in them by organic compounds have been considered. The effectiveness of organic compounds in slowing down the corrosion of steels, as a rule, either decreases with increasing t or passes through a maximum at 60 °C. It was noted that there is a group of high-temperature corrosion inhibitors, the temperature maximum of which lies above 60 °C, that allows them to be used in the protection of steels even in environments with t > 100 °C. The general approaches to the protection of steels in solutions of mineral acids under conditions of high-temperature corrosion (t > 80 °C) with unsaturated organic compounds (UC) and mixtures based on them were analyzed. The use of multicomponent compound containing UC is appropriate for the protection of steels in high-temperature solutions of acids, in some cases at t up to 250 °C. The ability to protect steels at such high t is due to the unique mechanism of the UC inhibitory action, which is the result of their ability to chemisorption on the metal surface and undergo deep chemical transformations leading to the formation of a protective polymer film. Limitations on the use of UC as corrosion inhibitors are associated with their chemical instability in volume of acid, as well as toxicity of UC itself and composite additives used with them.

High-Temperature Corrosion in Gas Turbines and Steam Boilers by Fuel Impurities—Part VII: Evaluation of Magnesium-Aluminum-Silicon Combinations as Corrosion Inhibitors

1976 ◽  
Vol 98 (4) ◽  
pp. 511-516 ◽  
Author(s):  
W. R. May ◽  
M. J. Zetlmeisl ◽  
R. R. Annand
Keyword(s):  
High Temperature ◽  
Linear Regression ◽  
Corrosion Inhibitor ◽  
Gas Turbines ◽  
Corrosion Inhibitors ◽  
High Temperature Corrosion ◽  
Regression Analyses ◽  
Stepwise Linear Regression ◽  
Fuel Ash ◽  
Steam Boilers

Aluminum, alone and in several combinations with magnesium and silicon, has been evaluated as a corrosion inhibitor and slag modifier for heavy fuel ash. Stepwise linear regression analyses were carried out on the data and the results are compared with earlier data on magnesium and silicon. The Mg-Al-Si combination gives superior tolerance to aggravation of corrosion caused by sodium. It gives the slag a friability equivalent to Mg-Si combinations.

High-Temperature Corrosion in Gas Turbines and Steam Boilers by Fuel Impurities: IV—Evaluation of Silicon and Magnesium-Silicon as Corrosion Inhibitors

1974 ◽  
Vol 96 (2) ◽  
pp. 124-128 ◽  
Author(s):  
W. R. May ◽  
M. J. Zetlmeisl ◽  
R. R. Annand
Keyword(s):  
High Temperature ◽  
Magnesium Sulfate ◽  
Vanadium Pentoxide ◽  
Sodium Sulfate ◽  
Gas Turbines ◽  
Corrosion Inhibitors ◽  
High Temperature Corrosion ◽  
Corrosion Rates ◽  
Steam Boilers

The corrosion rates of Udimet™ 500 in a variety of sodium sulfate-silica-vanadium pentoxide and sodium sulfate-magnesium sulfate-silica-vanadium pentoxide slag compositions were measured electrochemically at temperatures up to 950 deg. The weight ratios of the elements, sodium, silicon, and magnesium to vanadium were defined for acceptable corrosion rates. A simple burner test for slag evaluation is described. Characteristics of slags produced by magnesium, silicon, and magnesium-silicon in conjunction with sodium sulfate and vanadium pentoxide are discussed. Results indicate that the magnesium-silicon combination produces a slag which is equally as low as magnesium in corrosivity and superior in slag characteristics.

NICROFER 5520 Co

Alloy Digest ◽  
1995 ◽  
Vol 44 (3) ◽  
Keyword(s):  
High Temperature ◽  
Chemical Composition ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Temperatures ◽  
Heat Treating ◽  
High Temperature Corrosion ◽  
Creep Properties ◽  
Nickel Chromium ◽  
Temperature Performance

Abstract NICROFER 5520 Co is a nickel-chromium-cobalt-molybdenum alloy with excellent strength and creep properties up to high temperatures. Due to its balanced chemical composition the alloy shows outstanding resistance to high temperature corrosion in the form of oxidation and carburization. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: Ni-480. Producer or source: VDM Technologies Corporation.

INCOLOY ALLOY 890

Alloy Digest ◽  
2003 ◽  
Vol 52 (8) ◽  
Keyword(s):  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Temperature Corrosion ◽  
Temperature Performance ◽  
Incoloy Alloy

Abstract Alloy 890 provides improved properties over those of Incoloy alloys 800HT and 803 via the addition of silicon and molybdenum to optimize the performance of the alloy. Alloy 890 is typically 43% Ni, 25% Cr, 1.85 Si, 1.5% Mo, and 0.45% Nb, with the balance being principally iron. The alloy offers a significant improvement in resistance to high-temperature corrosion. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on high temperature performance as well as forming, heat treating, and joining. Filing Code: Ni-611. Producer or source: Special Metals Corporation.

INCONEL ALLOY 671

Alloy Digest ◽  
1972 ◽  
Vol 21 (10) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Surface Treatment ◽  
Heat Treating ◽  
High Temperature Corrosion ◽  
Chromium Alloy ◽  
Inconel Alloy ◽  
Nickel Chromium ◽  
Temperature Performance

Abstract INCONEL ALLOY 671 is a nickel-chromium alloy having excellent resistance to high-temperature corrosion. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-180. Producer or source: Huntington Alloy Products Division, An INCO Company.

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