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Search Results for corrosion rate
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Published: 15 January 2021
Fig. 8 Increase in corrosion rate for steel treated with a corrosion inhibitor in carbon-dioxide-saturated 3% saline solution with addition of acetate. Source: Ref 52 . Reprinted with permission from NACE International
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Published: 01 January 2002
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Published: 01 January 2002
Fig. 13 Effect of acid concentration on the corrosion rate of iron completely immersed in aqueous solutions of three inorganic acids at room temperature. It should be noted that the scales for corrosion rate are not the same for all three charts. As discussed in text, the corrosion rate
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Published: 15 January 2021
Fig. 13 Effect of acid concentration on the corrosion rate of iron completely immersed in aqueous solutions of three inorganic acids at room temperature. It should be noted that the scales for corrosion rate are not the same for all three charts. As discussed in the text, the corrosion rate
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in Corrosion Failure of the Rocky Point Viaduct
> ASM Failure Analysis Case Histories: Buildings, Bridges, and Infrastructure
Published: 01 June 2019
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Published: 01 December 2019
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Published: 01 December 2019
Fig. 14 Corrosion rate of Monel 400 exposed to a 5 wt.% HCl solution, as a function of temperature. Source: Ref 7
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Published: 01 January 2002
Fig. 7 Corrosion rates in 3% NaCl solution of magnesium alloy AZ31B coupled with aluminum containing varying amounts of iron and magnesium. The corrosion rate of uncoupled AZ31B is shown for comparison.
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Published: 01 January 2002
Fig. 6 Initial corrosion rates for steel exposed to carbonated 3% NaCl solution with 0, 100, and 1000 ppm acetate of 4, 9, and 18 mm/year (0.2, 0.4, and 0.7 in./year), respectively. This order is sustained after addition of 25 ppm of a corrosion inhibitor, despite a significant reduction
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Published: 15 January 2021
Fig. 7 Corrosion rates in 3% NaCl solution of magnesium alloy AZ31B coupled with aluminum containing varying amounts of iron and magnesium. The corrosion rate of uncoupled AZ31B is shown for comparison.
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Published: 15 January 2021
Fig. 22 Schematic diagram of shipboard engine corrosion rates of type I and type II hot corrosion versus temperature in a marine environment compared with the Arrhenius oxidation rate versus temperature. LTHC, low-temperature hot corrosion; HTHC, high-temperature hot corrosion. Courtesy of U.S
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Published: 01 January 2002
Fig. 5 Rate of corrosion of unprotected steel in biologically active soil as a function of iron sulfide present
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Published: 15 January 2021
Fig. 5 Rate of corrosion for steel sustained over a six-week period in biologically active, wet, high-clay soil as a function of iron sulfide present under anaerobic conditions in laboratory tests. SRB, sulfate-reducing bacteria
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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001560
EISBN: 978-1-62708-217-4
... may have occurred. A study was made for stress-corrosion cracking susceptibility of 4340 steel in a paste made of the residues collected from used breech chambers. The constant extension rate test (CERT) technique was employed and SCC susceptibility was demonstrated. The residues, which contained both...
Abstract
Military aircraft use a cartridge ignition system for emergency engine starts. Analysis of premature failures of steel (AISI 4340) breech chambers in which the solid propellant cartridges were burned identified corrosion as one problem with an indication that stress-corrosion cracking may have occurred. A study was made for stress-corrosion cracking susceptibility of 4340 steel in a paste made of the residues collected from used breech chambers. The constant extension rate test (CERT) technique was employed and SCC susceptibility was demonstrated. The residues, which contained both combustion products from the cartridges and corrosion products from the chamber, were analyzed using elemental analysis and x-ray diffraction techniques. Electrochemical polarization techniques were also utilized to estimate corrosion rates.
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c9001013
EISBN: 978-1-62708-234-1
... by the corrosive, high velocity gas flow. The corrosion rate of either the inhibited or uninhibited gas stream was too high for equipment in high pressure gas service. Type 410 (12% Cr) stainless steel was recommended for the choke bodies because other equipment such as valves made of type 410 showed no evidence...
Abstract
A wall section of a carbon steel choke body in gas service at 4400 psig blew out three months after the use of a corrosion inhibitor was stopped. Corrosion damage occurred in ripples, leaving both smoothly polished and unattacked areas. The corrodent in condensate wells was principally carbon dioxide dissolved in water condensed from the gas stream, with organic acids possibly an aggravating factor. A gas analysis showed no other corrosive agents. No metallurgical or fabrication defects were found in the carbon steel part. The mode of attack was corrosion-erosion, caused by the corrosive, high velocity gas flow. The corrosion rate of either the inhibited or uninhibited gas stream was too high for equipment in high pressure gas service. Type 410 (12% Cr) stainless steel was recommended for the choke bodies because other equipment such as valves made of type 410 showed no evidence of corrosion damage after three years' exposure. This change was made five years ago and there have been no failures since.
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001779
EISBN: 978-1-62708-241-9
... from critical areas of the pump were examined using optical and scanning electron microscopy, electrochemical analysis, and tensile testing. Based on microstructure and morphology, estimated corrosion rates, and particle concentrations in the feedwater, it was concluded that cavitation and erosion were...
Abstract
Material samples collected from failed booster pumps were analyzed to determine the cause of failure and assess the adequacy of the materials used in the design. The pumps had been in service at a power plant, transporting feedwater from a deaerator to a main turbine boiler. Samples from critical areas of the pump were examined using optical and scanning electron microscopy, electrochemical analysis, and tensile testing. Based on microstructure and morphology, estimated corrosion rates, and particle concentrations in the feedwater, it was concluded that cavitation and erosion were the dominant failure mechanisms and that the materials and processes used to make the pumps were largely unsuited for the application.
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001720
EISBN: 978-1-62708-227-3
... would have no effect on corrosion rate under aerobic conditions that may occur in local areas on the hull. In the part of the ship from which samples for this report were obtained, high temperatures above 1340 deg F did not occur. Hull plate samples from the submerged wreckage are not yet available...
Abstract
Metallographic studies found that steel used to fabricate the U.S.S. Arizona battleship during original construction, 1913-1915 and reconstruction, 1929-1931 were consistent with the best materials available during each time period. Due to the force of the forward magazine detonation, the best steel available today would not have had any impact on the outcome. Heavy banding in steels from both periods could adversely affect the corrosion resistance under anaerobic conditions that prevail during a corrosion cycle that has developed under hard biofouling layers for over 58 years. Banding would have no effect on corrosion rate under aerobic conditions that may occur in local areas on the hull. In the part of the ship from which samples for this report were obtained, high temperatures above 1340 deg F did not occur. Hull plate samples from the submerged wreckage are not yet available. These samples will be important to confirm findings to this time and determine the remaining thickness of the hull plate and, indirectly, the integrity of the fuel oil tanks.
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.chem.c9001525
EISBN: 978-1-62708-220-4
... then evaluated for polarization resistance and corrosion rate when immersed in the mildly alkaline product that is stored in the tanks. The tanks were all studied at ambient temperature. Electrochemical Impedance Electrochemical corrosion test cells were assembled to expose the surface of each panel...
Abstract
Welded steel storage vessels used to hold mildly alkaline solution were produced in exactly the same manner from deep-drawn aluminum-killed SAE 1006 low-carbon steel sheet. After the cylindrical shell was drawn, a top low-carbon steel closure was welded to the inside diameter. The containers were then filled with the slightly alkaline solution, pressurized, and allowed to stand under ambient conditions. A small number, less than 1%, were returned because they began to leak in service. Inspection revealed general corrosion and pitting on the inner surfaces. However, other tanks that experienced the same service conditions developed no corrosion. Corrosion was linked to forming defects that provided sites for localized corrosion, and to lack of steam drying after cleaning, which increased susceptibility to general corrosion.
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003549
EISBN: 978-1-62708-180-1
... and the reduction of oxygen. Since the rates of oxidation and reduction must be equal, increasing the total reduction rate increases the rate of zinc solution. Therefore, acid solutions containing dissolved oxygen normally will be more corrosive than air-free acids. Oxygen reduction simply provides another means...
Abstract
This article provides an overview of the electrochemical nature of corrosion and analyzes corrosion-related failures. It describes corrosion failure analysis and discusses corrective and preventive approaches to mitigate corrosion-related failures of metals. These include: change in the environment; change in the alloy or heat treatment; change in design; use of galvanic protection; use of inhibitors; use of nonmetallic coatings and liners; application of metallic coatings; use of surface treatments, thermal spray, or other surface modifications; corrosion monitoring; and preventive maintenance.
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in Biologically Influenced Corrosion of Stainless Steel Welds by Water
> ASM Failure Analysis Case Histories: Failure Modes and Mechanisms
Published: 01 June 2019
Fig. 11 Preferential corrosion of filler material in MIC attack area. Rates of attack on ferrite and austenite phases differ. 200×.
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