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Hot corrosion studies on flame spray coated AISI H13 steel
Published in
2013
Volume: 16
   
Abstract
This paper presents the experimental investigations carried out to study the influence of addition of Tungsten Carbide (WC) on the scratch resistance and high temperature corrosion behaviour of flame sprayed EWAC 1001 coatings on the AISI H13 steel substrate. The improvement in properties were analysed by conducting various tests such as micro structural analysis, micro hardness and scratch tests. Moreover, high temperature corrosion tests were carried out on the coated as well as uncoated AISI H13 steel by exposing the material to air oxidation at 700 °C under cyclic conditions. The thermo-gravimetric technique was used to establish kinetics of corrosion whereas XRD and SEM/EDAX techniques were used to analyze the AISI H13 steel with EWAC 1001 coating containing WC showed better resistance to high temperature corrosion as compared to that of uncoated AISI H13 steel. It is observed that the formation of Cr2O3, NiO and NiCr2O4 contributes to the enhancement of high temperature corrosion resistance of the coating. The formation of unprotective Fe2O3 oxide leads to intense spalling and peeling of the scales in the uncoated material. The results presented in this paper would be beneficial for improving properties of tools used in the die casting industry. © 2013 University of Manchester and the authors.
About the journal
JournalJournal of Corrosion Science and Engineering
ISSN14668858