EFFECTS OF INHIBITORS ON CORROSION OF LOW CARBON STEEL IN HYDROCHLORIC ACID PICKLING SOLUTION
EFFECTS OF INHIBITORS ON CORROSION OF LOW CARBON STEEL IN HYDROCHLORIC ACID PICKLING SOLUTION
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Date
2014-09-19
Authors
NJOKU, ROMANUS EGWUONWU
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Abstract
The effects of inhibitors on corrosion of low carbon steel in hydrochloric acid pickling solution
was investigated by weight loss and hydrogen evolution measurements using a beaker-funnelburette
arrangement.
Corrosion and hydrogen evolution rates were computed for steel samples immersed in
hydrochloric acid pickling solutions with the addition of varying concentrations of organic
(formaldehyde, acetaldehyde. and benzaldehyde) and inorganic (sodium dichromate and sodium
nitrite) inhibitors.
The organic compounds inhibit both the corrosion and hydrogen evolution rates while the
inorganic salts stimulate the corrosion but inhibit hydrogen evolution rate.
Acetaldehyde showed the highest inhibition efficiency. Inhibition by the organic compounds
could be attributed to adsorption phenomena while corrosion stimulation by the inorganic salts
was due to their inability to form stable passivating film on the steel surface.
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY, ZARIA.
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR
THE AWARD OF THE DEGREE OF MASTER OF SCIENCE
(M.Sc) IN METALLURGICAL ENGINEERING
Keywords
INHIBITORS,, CORROSION,, LOW CARBON STEEL,, HYDROCHLORIC,, ACID PICKLING SOLUTION