High Temperature Corrosion Rates of Several Metals with Nitric Oxide

1955 ◽  
Vol 102 (8) ◽  
pp. 446 ◽  
Author(s):  
Milton Farber ◽  
Alfred J. Darnell ◽  
Donald M. Ehrenberg
Keyword(s):  
Nitric Oxide ◽  
High Temperature ◽  
High Temperature Corrosion ◽  
Corrosion Rates

High Temperature Corrosion Resistance of Different Commercial Alloys Under Various Corrosive Environments

2007 ◽  
Author(s):  
Shang-Hsiu Lee ◽  
Marco J. Castaldi
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Metal Surface ◽  
Flue Gas ◽  
Thermal Gradient ◽  
Operating Cost ◽  
High Temperature Corrosion ◽  
Waste To Energy ◽  
Corrosion Rates ◽  
Corrosive Environments

High temperature corrosion is a major operating problem because it results in unscheduled shutdowns in Waste-to-Energy (WTE) plants and accounts for a significant fraction of the total operating cost of WTE plants. Due to the heterogeneous nature of municipal solid waste (MSW) fuel and the presence of aggressive elements such as sulfur and chlorine, WTE plants have higher corrosion rates than coal-fired power plants which operate at higher temperature. To reduce corrosion rates while maximizing the heat recovery efficiency has long been a critical task for WTE operators. Past researchers focused on high temperature corrosion mechanisms and have identified important factors which affect the corrosion rate [1–4]. Also, there have been many laboratory tests seeking to classify the effects of these corrosion factors. However, many tests were performed under isothermal conditions where temperatures of flue gas and metal surface were the same and did not incorporate the synergistic effect of the thermal gradient between environment (flue gas) and metal surface. This paper presents a corrosion resistance test using an apparatus that can maintain a well controlled thermal gradient between the environment and the surface of the metals tested for corrosion resistance. Two commercial substrates (steels SA213-T11 and NSSER-4) were tested under different corrosive environments. The post-test investigation consisted of mass loss measurement of tested coupons, observation of cross-sectional morphology by scanning electron microscopy (SEM), and elemental analysis of corrosion products by energy dispersive spectrometry (EDS). The stainless steel NSSER-4 showed good corrosion resistance within the metal temperature range of 500 °C to 630 °C. The alloy steel SA213-T11 had an acceptable corrosion resistance at metal temperatures up to 540 °C, and the performance decreased dramatically at higher temperatures.

Development of a Coal Ash Corrosivity Index for High Temperature Corrosion

1987 ◽  
Vol 109 (4) ◽  
pp. 299-305 ◽  
Author(s):  
Jun-Ichi Shigeta ◽  
Yoshio Hamao ◽  
Hiroshi Aoki ◽  
Ichiro Kajigaya
Keyword(s):  
High Temperature ◽  
Steam Generator ◽  
Power Plants ◽  
Coal Ash ◽  
High Temperature Corrosion ◽  
Laboratory Studies ◽  
Current Development ◽  
Corrosion Rates ◽  
Steam Generator Tubes ◽  
Good Agreement

Current development of Advanced Steam Cycle coal-fired power plants requires superheater and reheater tubing alloys which can withstand severe conditions for high temperature corrosion. A corrosion equation to predict corrosion rates for candidate alloys has been developed by a study of deposits removed from steam generator tubes and from test probes installed in a boiler, supplemented by laboratory studies using synthetic coal ash. The corrosion equation predicts corrosion for a particular coal as a function of its content of sulfur, acid-soluble alkalies, and acid-soluble aklaline earths. Good agreement was obtained between the corrosion equation and 6000-hour tests using probes of TP347H and 17-14 CuMo.

High-Temperature Corrosion in Gas Turbines and Steam Boilers by Fuel Impurities—Part V: Lead Containing Slags

1975 ◽  
Vol 97 (3) ◽  
pp. 441-447 ◽  
Author(s):  
M. J. Zetlmeisl ◽  
W. R. May ◽  
R. R. Annand
Keyword(s):  
High Temperature ◽  
Linear Polarization ◽  
Gas Turbines ◽  
Sodium Level ◽  
High Temperature Corrosion ◽  
Corrosion Rates ◽  
Polarization Technique ◽  
Steam Boilers

The effect of lead on the corrosivity and friability of slags containing various ratios of sodium, vanadium, magnesium, and silicon has been evaluated. The application of the linear polarization technique was demonstrated. Lead produces very corrosive melts and tenacious slags. Magnesium will inhibit corrosion to acceptable levels and produce friable slags at 800 °C with a 4 to 1 ratio of additive to vanadium plus lead and a sodium to vanadium plus lead ratio no greater than 0.1. To produce friable slags at 900°, sodium must first be reduced to a sodium to vanadium plus lead ratio of 0.01. Second, a magnesium-silicon additive must be used at a 6 to 1 ratio of additive to vanadium plus lead. The corrosion rates of lead containing melts increases rapidly with sodium level.

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.

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