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Nwokeocha, T. O.
Department of Mechanical Engineering, Nnamdi Azikiwe University, Awka, Nigeria
Nwoye, C. I.
Chemical Systems and Data Research Laboratory, Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria
Chima, O. M.
Department of Mechanical Engineering, Michael Okpara University of Agriculture, Umudike, Nigeria
ABSTRACT
This paper presents the reliability level of
corrosion rate and hydrogen evolution rate dependence on the initial
temperature of hydrochloric acid - bilberry cactus extract solution submerging
mild steel during service obtained using empirical modelling. The range of
process parameters used for initial solution temperatures, corrosion rate and
hydrogen evolution rate are 30- 60 (0C), 0.0043- 0.0086 (g cm-2
h-1) and 0.016- 0.0568 (ml cm-2 min-1)
respectively. It is strongly believed that hydrogen evolution resulted from the
interaction between mild steel and HCl during the corrosion process. A model; ϑ = antilog (Ѵ/₰)Ϧ was derived to evaluate
the relationship between the initial solution temperature and corrosion rate
(of the submerged mild steel) with hydrogen evolution (of the acid). The
temperature was evaluated to be directly proportional to the antilog of
quotient of hydrogen evolution rate (from the acid) and corrosion rate of the
mild steel. The validity of the model was rooted on the core model expression
Log ϑ = (Ѵ/₰)Ϧ where both sides of the expression are
correspondingly almost equal. The
standard error incurred in predicting the model-based initial solution
temperature relative to the actual results is 1.8306%. Deviational analysis of
model-predicted results with respect to actual results was The correlation coefficients between
temperature and corrosion rate & hydrogen evolution rate were all > 0.93. Hence, the predicted relationship
between the initial temperature and corrosion rate with hydrogen evolution of
hydrochloric acid - bilberry cactus extract solution submerging mild steel
during service has been established.
Keywords: Mild steel corrosion, bilberry cactus extract, hydrochloric acid, temperature, hydrogen evolution
https://doi.org/10.33922/j.ujet_v7i1_6
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Published
Tuesday, June 01, 2021
Issue
Vol. 7 No. 1, June 2021
Article Section
GENERAL
The contents of the articles are the sole opinion of the author(s) and not of UJET.
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