O.O. Oluwole, P.O. Atanda, O.A. Odekunbi, E. Odegbaju
Materials Science and Engineering Department,Obafemi Awolowo University, Nigeria.
Mechanical Engineering Department,University of Ibadan, Nigeria.
DOI: 10.4236/jmmce.2009.810069   PDF    HTML     7,041 Downloads   9,499 Views   Citations

Abstract

This research work investigated the corrosion resistance of nickel- plated medium carbon steel and 18/8 stainless steel in cassava fluid (i.e. containing hydrogen cyanide). It simulated the effect of continuous use of the materials in a cyanide environment where corrosion products are left in place. Low carbon steel sample was nickel electroplated at 4V for 35 minutes. The plated sample, the unplated and the 18/8 stainless steel were then subjected to a cassava fluid environment for thirty days. The electrode potentials, in mV (SCE), were measured every day. Weight loss was determined at intervals of 5 days for duration of the exposure period. The result showed little corrosion attack on the nickel-plated steel on the fifth and tenth days which quickly dropped to zero by the 15^th day and remained at the passive state till the 20^th day when corrosion picked up again increasing steadily, linearly until the end of the test day. Corrosion of the 18/8 stainless steel was very low as well decreasing till the last day of the test. The pH of the cassava solution which initially was acidic because of the cyanide content in the cassava was observed to progress to neutrality within five days and to alkalinity at the end of the thirty days test (because of corrosion product contamination of the cyanide). Un-plated steel was found to be unsuitable for the fabrication of cassava processing machinery because of the very high corrosion rate. 18/8 stainless steel was found suitable for use in this environment. The renewed corrosion activity on nickel plated steel after the 20^th day (pH=12) of continuous use in cyanide environment makes it unsuitable for use.

Keywords

Corrosion resistance, 18/8 stainless steel, nickel-plated low carbon steel, Cassava fluid

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Conflicts of Interest

The authors declare no conflicts of interest.

References

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