日本金属学会誌

J. Japan Inst. Met. Mater, Vol. 81, No. 02 (2017),
pp. 89-96

Effect of Ions Eluted from Metal Surface on Transformation and Growth of Calcium Carbonate Polymorphisms

Ryohei Hashimoto 1, Motoaki Morita 1, Osamu Umezawa 2 and Shinichi Motoda 1

1 Graduate School, Tokyo University of Marine Science and Technology
2 Faculty of Engineering, Yokohama National University

Abstract:

The amounts of calcium carbonate adhered on sheets (PVC, carbon steel, Type 316 stainless steel, and Cu) and coated steels sheets (Cu, Zn, Ni, Ni-P, and Ni-W-P coated steels) were investigated in the synthesis solution. The transformation and crystal growth of the calcium carbonate were different among the materials. The primary form in the adhered polymorphisms was calcite on PVC, carbon steel, Type 316 stainless steel, Cu, and Cu coated steel, and aragonite on Zn, Ni, Ni-P, and Ni-W-P coated steels, and vaterite was not primary form on all materials. The materials, on which the primary form in the adhesion polymorphisms is calcite, showed large adhesion amounts because calcite is stable phase and its solubility is lower than the other polymorphisms. The crystal growths of the specific polymorphisms on some materials were inhibited, and the irregular shapes of their polymorphisms formed: calcite adhered on carbon steel and Ni, Ni-P, Ni-W-P coated steels, aragonite adhered on Zn, Ni-P, and Ni-W-P coated steels became the irregular shape. The comprised elements of the material surfaces were detected at the surface of the calcium carbonate crystals adhered on the materials. The transformation and crystal growth are affected by the elution ions from the material surfaces, and the effects of eluted ions (Fe2+, Cu2+, Zn2+, Ni2+, and ) from these materials were almost same with the ones of previous studies. To reduce the adhesion amount of calcium carbonate, the material comprised of the elements, which shows the inhibitor effects of the transformation and the crystal growths of many kinds of polymorphisms, is better.

[doi:10.2320/jinstmet.J2016045]


(Received 2016/07/29)

Keywords:

scale formation, metal ion, scale inhibitor, geothermal plant, cooling tower, heat exchanger, fouling


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