Diffusion Coatings for Corrosion-Resistant Components in Coal Gasification Systems

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Description

Heat-exchangers, particle filters, turbines, and other components in integrated coal gasification combined cycle system must withstand the highly sulfiding conditions of the high-temperature coal gas over an extended period of time. The performance of components degrades significantly with time unless expensive high alloy materials are used. Deposition of a suitable coating on a low-cost alloy may improve its resistance to such sulfidation attack, and decrease capital and operating costs. The alloys used in the gasifier service include austenitic and ferritic stainless steels, nickel-chromium-iron alloys, and expensive nickel-cobalt alloys. During this period, we analyzed several coated and exposed samples of 409 ... continued below

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Krishnan, Gopala N.; Malhotra, Ripudaman; Alvarez, Esperanza; Lau, Kai-Hung; Perez-Mariano, Jordi & Sanjurjo, Angel June 30, 2006.

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Description

Heat-exchangers, particle filters, turbines, and other components in integrated coal gasification combined cycle system must withstand the highly sulfiding conditions of the high-temperature coal gas over an extended period of time. The performance of components degrades significantly with time unless expensive high alloy materials are used. Deposition of a suitable coating on a low-cost alloy may improve its resistance to such sulfidation attack, and decrease capital and operating costs. The alloys used in the gasifier service include austenitic and ferritic stainless steels, nickel-chromium-iron alloys, and expensive nickel-cobalt alloys. During this period, we analyzed several coated and exposed samples of 409 steel by scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX). We report here on findings of this analysis: (1) A SS409 coupon that was coated with multilayered combined nitrides of Ti, Al, and Si showed adherent coatings on the surface; (2) A similarly coated coupon, after exposure to simulated coal gas at 900 C for 300 h, revealed that the coating has cracked during the exposure; (3) An SS409 coupon that was coated with nitrides of Ti and Si with a barrier layer of tungsten in between to improve the adhesion of the coating and to prevent outward diffusion of iron to the surface. (4) A porous coupon was coated with nitrides of Ti and Al and examination of the coupon revealed deposition of Ti at the interior surfaces. A similarly prepared coupon was exposed to simulated coal gas at 370 C for 300 h, and it showed no corrosion.

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  • Report No.: None
  • Grant Number: FC26-03NT41616
  • DOI: 10.2172/891455 | External Link
  • Office of Scientific & Technical Information Report Number: 891455
  • Archival Resource Key: ark:/67531/metadc882405

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  • June 30, 2006

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 23, 2016, 3:49 p.m.

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Krishnan, Gopala N.; Malhotra, Ripudaman; Alvarez, Esperanza; Lau, Kai-Hung; Perez-Mariano, Jordi & Sanjurjo, Angel. Diffusion Coatings for Corrosion-Resistant Components in Coal Gasification Systems, report, June 30, 2006; United States. (digital.library.unt.edu/ark:/67531/metadc882405/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.