Journal of Oil Palm Research Vol. 29  March 2017 p.  97-109
DOI:

CORROSION INHIBITION OF MILD STEEL IN HYDROCHLORIC ACID SOLUTION USING FATTY ACID DERIVATIVES

Author(s): MOHD, N K*; MARIYAM JAMEELAH GHAZALI**; YEONG SHOOT KIAN*; NOR AZOWA IBRAHIMǂ; WAN MD ZIN WAN YUNUSǂǂ; SITI MARIAM MOHD NORǂ and ZAINAB IDRIS*

The inhib­i­tive actions of fatty acid deriv­a­tives namely palmi­tate hydrazide (PH), N-ethylidene palmi­tate hydrazide (EPH) and N-phenylmethylidene palmi­tate hydrazide (PPH) on mild steel in 1 M hydrochlo­ric acid were inves­ti­gated using open cir­cuit poten­tial, lin­ear polar­i­sa­tion and elec­tro­chem­i­cal imped­ance spec­troscopy tech­niques. It was observed that the per­cent­age of inhi­bi­tion effi­ciency (η%) increased with increas­ing con­cen­tra­tions of inhibitor and tem­per­a­ture of test medium. The max­i­mum η% approaches 85% in the pres­ence of 200 mg litre-1 of inhibitors EPH and PPH at 308 ± 1K. The inhibitor effi­cien­cies were found to be in the fol­low­ing order: PPH>EPH>PH. The adsorp­tion of these inhibitors on mild steel sur­face obeys Lang­muir adsorp­tion isotherm. They act as mixed-type inhibitors. Scan­ning elec­tron microscopy-energy dis­per­sive X-ray (SEM-EDX) was also car­ried out on pol­ished mild steel coupons and those immersed in the test medium with the absence and pres­ence of 200 mg litre-1 of the inhibitors studied.

Keywords: , , ,

Author Information
* Malaysian Palm Oil Board, 6 Persiaran Institusi, Bandar Baru Bangi, 43000 Kajang, Selangor, Malaysia. E-mail:


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