Inhibiting Effect of Nicotinic Acid Hydrazide on Corrosion of Aluminum and Mild Steel in Acidic Medium

Abstract

ABSTRACT. The corrosion behavior of aluminum and mild steel in hydrochloric acid medium was studied using a nicotinic acid hydrazide as inhibitor by potentiodynamic polarization, electrochemical impedance spectroscopy technique and gravimetric methods. The effects of inhibitor concentration and temperature were investigated. The experimental results suggested, nicotinic acid hydrazide is a good corrosion inhibitor for both aluminum and mild steel in hydrochloric acid medium and the inhibition efficiency increased with increase in the inhibitor concentration. The polarization studies revealed that nicotinic acid hydrazide exhibits mixed type of inhibition. The inhibition was assumed to occur via adsorption of the inhibitor molecules on the aluminum and mild steel surface and inhibits corrosion by blocking the reaction sites on the surface of aluminum.

Novel method for scalable synthesis of wollastonite nanoparticle as nano-filler in composites for promotion of anti-corrosive property

“…These characteristics pointed to the suitability of the MM coating for providing ideal anti-corrosive properties such as enough active surface area, blocking/limiting the physical contacts between the corroding species and the steel, resistance to the pitting, possibility to the surface storage for long time, large anti-corrosive efficacy, slow corrosion rate, etc. 8 . Consequently, no significant corrosion is detected after its coating on the surface of the electroactive supports.…”

“…Weight-loss of stainless steel plate coupons was noted after an immersing period of 42 days, sequentially according to the Eq. ( 1 ) reported below: where W 1 and W 2 are the weight of mild steel before and after immersion in the corrosive environment and C. R is the percentage of corrosion rate 8 .…”

“…where W 1 and W 2 are the weight of mild steel before and after immersion in the corrosive environment and C. R is the percentage of corrosion rate 8 .…”

“…In this study, the corrosion rate (C.R) in MPY (mils penetration per year) is calculated using (Eq. 5): 8 where "a" is the atomic weight of the metal, "i" is the current density in A cm -2 , "n" is the number of electrons lost, "D" is the density in g.cm -3 and "K" is a corrosion constant depending on the unit of corrosion rate 8 . By performing a weight-loss test, it was found that, the coating had a very high corrosion resistance.…”

“…They also involve the use of special equipment(s) to produce high tonnage with no desirable value. These reasons also demand the scientist to present a new method for producing wollastonite 8 . To solve these problems, hereby in this study, we have used a novel etching process with hydrofluoric acid for wollastonite production.…”