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01387 Surface Engineered Coatings for Metal Dusting

Picture for 01387 Surface Engineered Coatings for
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Product Number: 51300-01387-SG
ISBN: 01387 2001 CP
Author: George T. Bayer
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Surface engineering offers potential for eliminating metal dusting attack in several industrial applications. Pdor studies suggest that alumina forming alloys provide greatly improved resistance to carbon ingress as compared to chromia forming alloys. Thermodynamic calculations of phase stability diagrams also suggest the greatly enhanced stability of alumina in high carbon, low oxygen environments, such as those conducive to metal dusting. Since alumina forming alloys are expensive and difficult to fabricate, aluminum-rich surface alloy layers produced by diffusion coating processes are technically and economically attractive. Diffusion coatings containing aluminum alone and aluminum in combination with other elements are described, including their composition and microstructural characteristics. Results of published studies in methanol reforming, ammonia plant, and a laboratory test are presented that illustrate the ability of aluminum based diffusion coatings to eliminate metal dusting corrosion. Further testing is currently underway. Keywords: Surface engineering, aluminum diffusion coatings, metal dusting.
Surface engineering offers potential for eliminating metal dusting attack in several industrial applications. Pdor studies suggest that alumina forming alloys provide greatly improved resistance to carbon ingress as compared to chromia forming alloys. Thermodynamic calculations of phase stability diagrams also suggest the greatly enhanced stability of alumina in high carbon, low oxygen environments, such as those conducive to metal dusting. Since alumina forming alloys are expensive and difficult to fabricate, aluminum-rich surface alloy layers produced by diffusion coating processes are technically and economically attractive. Diffusion coatings containing aluminum alone and aluminum in combination with other elements are described, including their composition and microstructural characteristics. Results of published studies in methanol reforming, ammonia plant, and a laboratory test are presented that illustrate the ability of aluminum based diffusion coatings to eliminate metal dusting corrosion. Further testing is currently underway. Keywords: Surface engineering, aluminum diffusion coatings, metal dusting.
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