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The Link Between the Corrosion and calcium carbonate scaling susceptibilities of heat transfer surfaces
Author(s) -
Troup D. H.,
Richardson J. A.
Publication year - 1978
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19780290503
Subject(s) - aragonite , vaterite , nucleation , calcite , calcium carbonate , corrosion , materials science , copper , aluminium , graphite , metallurgy , induction period , scaling , mineralogy , chemistry , composite material , biochemistry , organic chemistry , catalysis , geometry , mathematics
The nucleation of CaCO 3 scales on copper, graphite, aluminium and mild steel heat transfer surfaces at surface temperatures 54–56°C, from turbulent solutions (Re 22,000) of bulk temperature 30 °C, has been studied using thermal resistance and corrosion potential measurements and scanning electron microscopy. The rate of CaCO 3 scale nucleation and growth decreases in the order mild steel > aluminium > copper and graphite. Scale nucleation apparently proceeds from the very outset, throughout an apparent thermal induction period, the end of which appears to be associated with the development of nuclei into aragonite clusters. The differing scaling susceptibilities of the materials are directly related to their corrosion susceptibilities. Studies on aluminium highlight the importance of the nature and integrity of surface oxide films in determining scaling susceptibility. Under the conditions examined, scales consist primarily of aragonite, with small amounts of calcite and vaterite. Mild steel surfaces apparently favour growth of “flower” vaterite.