TITLE:
Carbonate Coatings as Protective Barriers for Pipe Borne Water Transport Material
AUTHORS:
Lasisi Ejibunu Umoru, Abimbola Oladipo, Oladeji Oluremi Ige
KEYWORDS:
Plain carbon steel, Calcite, MgCO3, Dolomite and Microstructure
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.11 No.6,
June
15,
2012
ABSTRACT: This paper presents the report of corrosion prevention study carried out on plain carbon steel
lined with calcite, magnesium carbonate and dolomite as coats. Eight samples each of the steel
were dipped into solutions of CaCO3, CaCO3 and MgCO3, and MgCO3. Pipe borne water
obtained from Obafemi Awolowo University, Ile-Ife water works was used as the environment.
The corroded sample surfaces were subject to microstructural characterization using optical
microscopy technique. The results obtained showed that the steel exhibited minimum corrosion
rate of less than 0.5 mm/yr in dolomite, followed by MgCO3 and then by CaCO3 with corrosion
rate far above 0.5 mm/yr bench mark. The unlined (control) samples have maximum corrosion
rate of 0.8 mm/yr. the microstructures revealed widespread localized attacks and to a uniform
corrosion. The dolomite lined samples are recommended for corrosion prevention of plain
carbon steel in pipe borne water.