Effect of Ca2+and Mg2+ on corrosion and scaling of galvanized steel pipe in simulated geothermal water

In this paper, the effects of scaling ions (Ca2+ and Mg2+) on corrosion and scaling processes of galvanized steel pipe in geothermal water are presented. Spherical corrosion products and needle-shaped scale coexisted on the pipe surface. The concentration of Zn2+ and OHa degree affected the nuclei f...

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Bibliographic Details
Published in:Corrosion science 2010-07, Vol.52 (7), p.2244-2249
Main Authors: WU, Kun-Hu, ZHU, Li-Qun, LI, Wei-Ping, LIU, Hui-Cong
Format: Article
Language:English
Subjects:
Applied sciences
Calcium carbonate
Corrosion
Corrosion effects
Corrosion environments
Corrosion products
Exact sciences and technology
Galvanized steels
Geothermal
Metals. Metallurgy
Pipe
Pitting (corrosion)
Scale (corrosion)
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Summary:In this paper, the effects of scaling ions (Ca2+ and Mg2+) on corrosion and scaling processes of galvanized steel pipe in geothermal water are presented. Spherical corrosion products and needle-shaped scale coexisted on the pipe surface. The concentration of Zn2+ and OHa degree affected the nuclei formation of scale. The corrosion products and scale were identified as Zn(OH)2, ZnO, CaCO3 and MgCO3, respectively. When scale formed on the galvanized steel pipe, the corrosion rate slowed down and the pitting region became smaller.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2010.03.023