EFFECTS OF ORGANIC RESINS AND PLANT EXTRACTS ON CORROSION RATE OF MEDIUM CARBON STEEL IN TETRAOXOSULPHATE VI ACID MEDIUM
EFFECTS OF ORGANIC RESINS AND PLANT EXTRACTS ON CORROSION RATE OF MEDIUM CARBON STEEL IN TETRAOXOSULPHATE VI ACID MEDIUM
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Date
2007-08
Authors
Auwal, KASIM B.
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Abstract
The effects of organic resins (Methylene blue and Neutral red) and plant
extracts (piliostigma thonningii and Gmelina arborea) on corrosion rate of
medium carbon steel in 0.2M H2SO4 acid pickling solution were studied
with a view to comparing them with a known standard inhibitor (Sodium
Benzoate). Gravimetric and Gasometric measurements were carried out at
different inhibitor concentration and Temperature ranges of 0.05 – 0.5% and
30 – 600C respectively. Results obtained revealed that all the four
compounds tested acted as mixed-type inhibitors, reducing the dissolution of
iron and retarding H2 evolution, comparing favourably with the standard
inhibitor at all inhibitor concentrations and temperatures studied. The
maximum inhibition efficiencies of the compounds tested were obtained at
300C and increased progressively in order of: Neutral red (83.29%),
Methylene blue (90.96%), Sodium Benzoate (91.50%), Gmelina arborea
(96.98%) and Piliostigma thonningii (97.94%). The mechanism of
inhibition was elucidated by Kinetic and thermodynamic models. It was
concluded that the adsorption of the compounds onto the steel surface,
which obeyed the Langmuir and Temkin adsorption isotherms, is the main
mechanism of inhibition by these compounds.
Description
AN M.Sc THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL ,
AHMADU BELLO UNIVERSITY, ZARIA, NIGERIA
IN PARTIAL FULFILMENT FOR THE AWARD
OF MASTERS OF SCIENCE DEGREE IN
METALLURGICAL ENGINEERING
DEPARTMENT OF METALLURGICAL ENGINEERING
AHMADU BELLO UNIVERSITY, ZARIA.
NIGERIA
Keywords
EFFECTS,, ORGANIC,, RESINS,, PLANT,, EXTRACTS,, CORROSION,, RATE,, MEDIUM,, CARBON,, STEEL,, TETRAOXOSULPHATE VI,, ACID MEDIUM