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Hydrothermal Cement/Metal Interfaces
Author(s) -
Sugama Toshifumi,
Baldwin Stephanie
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb07901.x
Subject(s) - materials science , corrosion , cement , zinc , dissolution , phase (matter) , precipitation , metallurgy , metal , ettringite , hydrothermal circulation , bond strength , chemical engineering , composite material , layer (electronics) , portland cement , chemistry , adhesive , physics , organic chemistry , meteorology , engineering
We investigated the adherence of two cementitious materials, calcium phosphate cement (CPC) and silica flour‐filled class G cement (CGC), to metal substrates, such as cold‐rolled steel (CRS), stainless steel (SS), electroplated zinc‐coated steel (EZS), and zinc phosphate‐coated steel (ZPS) after autoclaving at 200°C. In CPC/metal joints, the γ‐AlOOH phase, which segregated from the hydroxyapatite phase of the CPC matrix, was preferentially precipitated on the CRS and SS surfaces and also mixed with the reaction products formed at the interfaces between CPC and EZS or ZPS. Precipitation of γ‐AlOOH caused the formation of a weak boundary layer at the interfacial transition zones, thereby resulting in a low shear‐bond strength. Although CGC accelerated the rate of corrosion of CRS and SS surfaces, the growth of Fe 2 O 3 clusters, formed as the corrosion products of metals at interfaces, aided the anchoring effect of xonotlite crystals as the major phase of CGC matrix, thereby conferring a high shear‐bond strength. The EZS and ZPS surfaces were susceptible to alkali dissolution caused by the attack of the high‐pH interstitial fluid of CGC pastes to the Zn and zinc phosphate coatings. Thus, the bond strengths of the CGC/EZS and /ZPS joints were lower than those of the joints made with CRS and SS.