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Exploring the hindering mechanism of element Ti on the adherence of CoO‐bearing one‐coat enamel/steel
Author(s) -
Chen Ken,
Chen Minghui,
Yu Zhongdi,
Zhu Shenglong,
Wang Fuhui
Publication year - 2018
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13063
Subject(s) - materials science , alloy , scanning electron microscope , enamel paint , nucleation , rutile , coating , diffusion , substrate (aquarium) , layer (electronics) , metallurgy , composite material , chemical engineering , chemistry , oceanography , organic chemistry , engineering , geology , physics , thermodynamics
The effect of element Ti on adherence between a CoO‐bearing single‐layer enamel coating and steel was investigated. Falling‐weights tests were carried out and cross‐sections at interface of the enamel/substrate were analyzed with a scanning electron microscopy ( SEM ) coupled with energy dispersive spectroscopy ( EDS ). Results show that addition of TiO 2 reduced adherence of the enamel coating by hindering the formation of anchor‐like alloy precipitates. The decrease of anchor points lies in the following three reasons: I. The diffusion path of Co 2+ ions to the interface was lengthened because of the blocking effect of rutile and the FeTiO 3 crystals; II . Formation of CoTiO 3 crystals leads to a reduction of free Co 2+ ions; III . Co–Fe precipitates form away from the enamel/substrate interface, as FeTiO 3 crystals provide extra surface for the nucleation of Fe–Co alloy precipitates.
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