TITLE:
Corrosion Characteristics of Ascast Ductile Iron in Lime Juice
AUTHORS:
F.O. Aramide, E.O. Olorunniwo, P.O. Atanda, J.O. Borode
KEYWORDS:
Ductile iron; Corrosion rate; Pitting; Acidity; pH.
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.9 No.10,
October
20,
2010
ABSTRACT: A study on the corrosion characteristics of ascast ductile iron in lime juice was conducted using
the common weight loss method. Five standard tensile samples were prepared from the ascast
condition of the alloy. One of them was taken to be for control, while the others were labeled A,
B, C, and D. These labeled samples were then immersed in freshly extracted lime juice for a
period of four weeks, having noted their respective initial weights. A sample was withdrawn from
the medium at the end of each week for microstructural and tensile properties (using INSTRON
1195 at a fixed crosshead speed of 10mm min-1) examination for comparison with those of the control sample. It was observed that the mechanical properties of the alloy were deteriorating due to pitting corrosion and that the corrosion rate increases with increase in the pH of the medium. It was concluded that corrosion rate can be kept to the minimum by controlling the pH of the media within the range 2.0 to 3.05.