Study the Efficiency of Poly Nicotine Amide as Anticorrosion Coating on Stainless Steel and Study Its Biological Activity

Abstract

Using an electrochemical polymerization technique at room temperature, poly nicotine amide (PNA) was produced from the monomer nicotine amide (NA) in aqueous solution. The structure of polymer layer generated on the stainless steel surface (316 L) (working electrode) is investigated by Fourier Transmission Infrared Region (FT-IR). The anti-corrosion activity of polymer coating on the stainless steel (SS 316 L) is investigated by electrochemical polarization in 0.20M solution of HCl at 293-323K. The graphene -modified polymer film-coated SS had greater protection efficiency (PE percent) when compared to Nano ZnO -modified polymer film-coated SS. For the corrosion process of SS 316 L, kinetic and thermo-dynamic parameters of activation are estimated. The antibacterial activity of coated film has been tested on both gram positive as well as gram negative bacteria by well diffusion approach, which include Staphylococcus aureus (Staph.Aure) and Ecoli. Through adding nanoparticles to a monomer solution to raise the effecincy of the polymer against the corrosion and bacterial, As a result, after modifying poly nicotine amide with nanomaterial, the inhibition zone values increased (Nano ZnO and Graphene).

Study of The Inhibition Corrosion of Aluminum Metal Using Peppermint Oil in An Acidic Medium

“…Figure (9) represents the relationship between Ci/(θ) vs. Ci .Table (3) indicates the values of K ads for the adsorption process in (1 M) of HCl acid at temperatures (303, 313, 323, 333 K).The data given indicate that the adsorption of the inhibitor on the surface of the metal is in great agreement with the Freundlich adsorption model. Increasing the concentration of the inhibitor leads to an increase in the efficiency of the inhibition that is adsorbed on the surface of the metal and blocks the active sites from acid attacks, as well as protecting the metal from corrosion [8] At a constant concentration of the inhibitor, we notice that the K ads equilibrium constant decreases with increasing temperature. therefore, the expected adsorption process on the surface is physical adsorption, and this is consistent with what was found that the inhibition efficiency decreases with increasing temperature [14].the values of the corosion rate can be used to analyze the adsorption mechanism according to Freundlich equation, which was calculated using equation (7) [15] 𝜃 = 𝐾𝑓𝐶𝑖𝑛 …………………………….…”

“…The rate was measured by weight loss method using equation (2) [7]The weight difference is a non-electrochemical method for determining corrosion rate and inhibition efficiency that gives more reliable results than electrochemical methods .Because the experimental conditions are dealt with more realistically [8] 𝐶𝑅(𝑀𝑀/𝑌) = (87.6 * ∆𝑊)/𝐷𝐴𝑡……………………… (2) where ∆W (mg) is the weight difference A (cm 2 ) the surface area D (g/cm 3 ) is the density of the mineral…”

“…From the values of K ads adsorption constant listed in Table (3), the free energy, ∆G o , was calculated using Equation (8).…”

“… To follow up the change in entropy ∆S o , its negative value at different temperatures and concentrations and for all inhibitors this indicates an increase in the orderliness of the system in the adsorption process resulting from the binding of the inhibitors on the metal surface.  The value of ∆G o obtained from equation (8) indicates the forces responsible for the adsorption process are of a physical nature.…”

“…The positive enthalpy values indicate that the corrosion process of the metal is of an endothermic nature,And the values of ∆s # indicate an increase in regularity in the transition state than it is in the initial state, and ∆G # indicates a higher energy barrier in the presence of an extract than it is in its absence. Table (8) (9) shows the values of the kinetic functions for each of the acid and the inhibitor, respectively…”