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Corrosion resistance and microstructural evaluation of the chromized coating process in a dual phase FeMnAlCr alloy by Jyh-Wei Lee; Jenq-Gong Duh; Shu-Yueh Tsai is a Engineering article available to read on EtoBox.

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Chromizing is a suitable method for coating development for high temperature surface protection, corrosion and wear resistance. A homogenized dual phase Fe -24%Mn -8.3%Al -5%Cr -0.38%Si -0.34%Mo -0.45%C cast alloy was chromized with a pack cementation process at 1000 8C for 1 -16 h. A chromized surface layer and an adjacent processing-related ferrite layer ranging from 80 to 100 mm in depth were formed. The thickness of the chromized layer X vs. the coating time t obeys the parabolic law: , where K is evaluated to be 5.89 mmy . The primary phase on the chromized surface is (Cr, Fe) N and the rest is y y ## XsK t h 2 1yx Cr C , while the internal part of chromized layer is Cr C phase. An appreciable increase of the surface hardness ranging from 23 6 7 3 2015 to 2458 HK is achieved due to the formation of chromium carbide layer. A significant improvement of the corrosion resistance in 3.5 wt.% NaCl aqueous solution is obtained. Chromized specimens exhibit only one-tenth weight loss compared to uncoated specimens when immersed in 90% Na SO and 10% NaCl molten salt at 877 8C for 48 h. ᮊ 2002 Elsevier Science 2 4 B.V. All rights reserved.

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Author

Jyh-Wei Lee; Jenq-Gong Duh; Shu-Yueh Tsai

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0257-8972)

Published

2002

Language

EN

Field

Engineering (Physical Sciences)