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barrier protection

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Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003555
EISBN: 978-1-62708-180-1
... coatings, thermal barrier coatings, and ceramic coatings. aluminide coatings carburization ceramic coatings chloridation corrosion fatigue high temperature corrosion hot corrosion hydrogen interaction metal dusting molten metals molten salts overlay coatings oxidation protective coatings...
Image
Published: 15 January 2021
Fig. 30 Schematic of thermal/environmental barrier coating (T/EBC) architecture showing primary environmental protective subsystems and the microstructure of coatings deposited by electron-beam physical vapor deposition. CMAS, calcium-magnesium-alumino-silicate. Reprinted with permission from More
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
... barrier that is stable over a considerable range of oxidizing power and is eventually destroyed in strong oxidizing solutions. Under conditions in which the surface film is stable, the anodic reaction is stifled and the metal surface is protected from corrosion. For example, stainless steel owes its...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006787
EISBN: 978-1-62708-295-2
... Abstract High-temperature corrosion can occur in numerous environments and is affected by various parameters such as temperature, alloy and protective coating compositions, stress, time, and gas composition. This article discusses the primary mechanisms of high-temperature corrosion, namely...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006782
EISBN: 978-1-62708-295-2
... film or protective barrier that is stable over a considerable range of oxidizing power and is eventually destroyed in strong oxidizing solutions. Under conditions in which the surface film is stable, the anodic reaction is stifled, and the metal surface is protected from corrosion. For example...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001518
EISBN: 978-1-62708-228-0
... to resist the normal operating pressures. The corrosion was caused by a combination of factors. The deformation and damage caused by screwing the outer ferrule on allowed water to penetrate through the protective outer coverings to the wire reinforcing. This area is also the maximum stress region...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.petrol.c9001148
EISBN: 978-1-62708-228-0
... into service in 1953 at an average depth of 40″ (1.0m) in the ground. It was subsequently learned that corrosion protection provisions included an organic coating of Lion Oil Company E-120 followed by wrapping with a fiberglass/asbestos wrapping material. This barrier protection was supplemented with cathodic...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001635
EISBN: 978-1-62708-221-1
... the maximum in-service operating pressures and spike pressure conditions. This corrosion was primarily caused by the protective outer covering being broken and allowing the ingress of water to the wire strands in a relatively isolated region. This was most likely due to mechanical damage in the form...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.conag.c9001634
EISBN: 978-1-62708-221-1
... of couplings there is nothing to prevent water ingress under the outer ferrule. In theory, by preventing water from getting into this critical region, any corrosion should be minimized. Although not common practice, where there is concern about potential corrosion the use of a barrier to prevent water ingress...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001829
EISBN: 978-1-62708-241-9
... Abstract An investigation was conducted to better understand the time-dependent degradation of thermal barrier coated superalloy components in gas turbines. First-stage vanes are normally subjected to the highest gas velocities and temperatures during operation, and were thus the focus...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006824
EISBN: 978-1-62708-329-4
... the rotation of the blade. Because the rotational speed of the turbine is relatively easily controlled, creep failures from excessive turbine speed are rare. Metal temperatures can increase beyond the design point, either from excessive heat input (increased firing temperature, loss of thermal barrier coating...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001827
EISBN: 978-1-62708-241-9
..., surface protection is required to minimize this effect. To protect and delay the destructive hot corrosion action, special corrosion protective coatings of two types, aluminide or chromium (diffusion) coatings and overlay coatings, are applied. Also to reduce the exposure of the superalloys to the highest...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001391
EISBN: 978-1-62708-215-0
... was a sintered thick film that was coated with a protective glass film after laser trimming and finished with an epoxy coating. Continuity through the resistive element was established by solder attachments to the assembly lead frame through edge terminations. Fig. 1 Chip detail schematic, indicating chip...
Book Chapter

Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003548
EISBN: 978-1-62708-180-1
... coating. If inert barrier coatings are employed, both the anode and cathode must be protected. Effect of Distance Dissimilar metals in a galvanic couple that are in close physical proximity usually suffer greater galvanic effects than those that are farther apart. The distance affects...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003556
EISBN: 978-1-62708-180-1
... the degradation of various protective systems, such as corrosion inhibitors and lubricants. The article describes the failure analysis of steel, iron, copper, aluminum, and their alloys. It also discusses the probes available to monitor conditions relevant to MIC in industrial systems and the sampling...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006783
EISBN: 978-1-62708-295-2
... barrier coatings are employed, both the anode and cathode must be protected. Effect of Distance Dissimilar metals in a galvanic couple that are in close physical proximity usually suffer greater galvanic effects than those that are farther apart. The distance between the cathode and the anode...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003551
EISBN: 978-1-62708-180-1
... particles to the working surface. The resulting buildup can be either a hard scale or lightly sintered cake acting as a protective barrier. In less obvious cases, dust and condensing gases fuse together to create an invasive liquid. In other instances, scaling and caking of refractory walls may...
Series: ASM Failure Analysis Case Histories
Volume: 2
Publisher: ASM International
Published: 01 December 1993
DOI: 10.31399/asm.fach.v02.c9001357
EISBN: 978-1-62708-215-0
... Abstract Two 20 MW turbines suffered damage to second-stage blades prematurely. The alloy was determined to be a precipitation-hardening nickel-base superalloy comparable to Udimet 500, Udimet 710, or Rene 77. Typical protective coatings were not found. Test results further showed that the fuel...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003567
EISBN: 978-1-62708-180-1
... Power-generation plants use processes that occur without any particles present and involve only the transport of solutions or steam. In these cases, liquid forces on the solid surface, which are due to turbulence or droplet impacts, mechanically remove protective layers of corrosion products, thus...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.aero.c9001145
EISBN: 978-1-62708-217-4
... by the cartridge ignition. There is no continuous flow within this volume and after pressurization it acts as a dead air space or thermal barrier to prevent excessive temperatures from occurring on the external surface of the dome. Cartridge combustion products can deposit between the heat shields and the chamber...