Uncoated Mild Steel Research Articles

Electrochemical behavior of mild steel coated with long alkyl-chain benzothiazole derivatives in acid solution: Effect of aliphatic chain length

Mild steel surfaces were coated with four different benzothiazole derivatives with long alkyl chain, namely 2-(heptyl)-benzothiazole (HEBT), 2-(tridecyl)-benzothiazole (TDBT), 2- (pentadecyl)-benzothiazole (PDBT), and 2-(heptadec-8-en-1-yl)benzothiazole (HDBT) from their respective chloroform solutions. Electrochemical experiments were conducted with coated and uncoated mild steel samples exposed to 1 M aqueous HCl at temperatures between 20°C to 50°C and at different immersion times from 6 h to 48 h. TDBT behaves as the best corrosion inhibitor among the four (more than 99 % efficiency at 40°C) and the order of inhibition efficiency follows the trend: TDBT>HDBT>PDBT>HEBT. This reflects the inhibition efficiency to increase with chain length initially, but decreases after a threshold. HDBT, in-spite of having longest aliphatic chain, exhibits better inhibitory performance over PDBT. This is attributed to the presence of unsaturation in HDBT. TDBT coating maintains high corrosion inhibition efficiency even after the 24 h of exposure (above 98 %). Occurrence of spatial hindrance during adsorption of BT derivatives with long aliphatic chain has been manifested by MD simulation.

Production and characterization of low-density silicon nitride reinforced zinc nanocomposite coatings on mild steel for applications in marine and automotive industries

In today's automotive, marine and petrochemical industries, the desire for lightweight materials has increased. Hence, necessitating the production of components with low density. In this work, lightweight Zn–Si3N4 coatings were developed by including Si3N4 in the zinc matrix. The optimal coatings were produced on steel samples at 45 °C and varied Si3N4 particles and voltages following ASTM A53/A53M standard. The deterioration (corrosion) property i.e. corrosion rate (CR) and current density (jocorr) of the uncoated (control) and coated samples were examined in 0.5 M of sulphuric acid using a potentiodynamic polarization technique following ASTM G3/G102 standard. The microstructure of the samples was studied via the SEM micrographs and XRD patterns, while the wear performance resistance (following ASTM G99 standard) and electrical conductivity of the samples were examined with a pin-on-disc tribometer and ammeter-voltmeter. The corrosion experiment indicated that the uncoated mild steel specimen possessed a CR of 12.345 mm year−1 and jocorr of 1060 μA/cm2, while the CR and jcorr of the coated samples ranged from 2.6793 to 4.7975 mm year−1 and 231−413 μA/cm2, respectively. The lower CR and jcorr values of the coated specimens, relative to the coated sample showed that the coatings possessed superior passivation ability in the test medium. The SEM micrographs of the samples showed refined morphology, while the XRD patterns revealed high peak intensity crystals such as Zn4SiN, ZnNSi, Zn4N and Zn2NSi, which could be beneficial to the mechanical properties and corrosion resistance of the steel. Moreover, the wear resistance study indicated that the COF of the uncoated sample ranged from 0.1 to 0.5, while those for coated specimens ranged from 0.05 to 0.35. Similarly, the uncoated steel exhibited a wear volume (WV) of 0.00508 mm3, while the WV of the coated specimens ranged from 0.00266 to 0.0028 mm3, indicating the existence of high strengthening mechanisms between the interface of the protecting device and the steel. Also, the electrical conductivity of the mild steel sample reduced from 12.97 Ω−1cm−1 to 0.64 Ω−1cm−1, indicating that the electrical resistivity of the steel was enhanced by the coatings.

Investigation of Garcinia kola Exudates as Corrosion Inhibitor for Mild Steel in Acidic Environment

This study investigated the performance of Garcinia kola exudates in preventing mild steel exposed to acid concentrated water and soil. The study was performed in order to find an alternative coating substance that can reduce the corrosion of mild steel pipes exposed to corrosive water and soil media. Various mild steel specimens were cut into portions and coated with the exudates at 25 - 50µm thickness. To accelerate the rate of corrosion, 0.5M hydrochloric acid (HCl) was added to tap water in a container. Also, the same concentration of HCl was equally added to soil samples. Uncoated mild steel specimens were immersed in the acid concentrated water and soil, servicing as control sample. The rate of corrosion was monitored for 30 days (720 hours). The inhibition efficiency of the exudates for both corrosive media was compared. Results showed that the weight loss and corrosion rate of mild steel decreased with increase in coating thickness. Comparatively, weight loss and corrosion rate in the uncoated specimens were higher than the coated specimens. For uncoated specimens, the corrosion rate was 0.2793mm/yr and 0.4150mm/yr for specimen immersed in water and soil respectively, but at 25µm coating thickness, it decreased to 0.01369mm/yr and 0.2870mm/yr for specimens in water and soil. Also, at 50µm coating thickness, corrosion rate decreased to 0.0052mm/yr and 0.0318mm/yr for specimens in water and soil, respectively. The inhibition efficiency increased with coating thickness, ranging from 51.00 – 98.15% for specimens immersed in water and 30.84 – 92.33% for specimens buried in soil at 25µm – 50µm coating thickness. The results demonstrated that Garcinia kola exudates can be used as corrosion inhibitor for mild steel exposed to corrosive media.

Tribo-corrosion behavior of Zn-Ni-Cu and Zn-Ni-Cu-TiB2 coated mild steel

In this investigation , Zn-Ni-Cu and Zn-Ni-Cu-TiB2 were coated on a mild steel specimen using a high velocity oxy fuel thermal spray (HVOF) process. The surface morphology and coated powder distribution of coated specimens were characterized using scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray-Elemental mapping. The pin-on-disc (ASTM G99-17) method was used to examine the wear resistance of the coated and uncoated mild steel specimens. Both coated Zn-Ni-Cu and Zn-Ni-Cu-TiB2 on mild steel saw reduced wear volume loss than uncoated mild steel. The coated samples of Zn-Ni-Cu and Zn-Ni-Cu-TiB2 on Mild Steel were put through a scratch test to determine the adhesion strength of the coating with the substrate. The adhesion strength of coated Zn-Ni-Cu and Zn-Ni-Cu TiB2 mild steel was higher than that of untreated mild steel, indicating a solid link between the coating and substrate and minimal delamination. Using the Vickers hardness test to measure the hardness caused by the coating, it was shown that coated samples of Zn-Ni-Cu and Zn-Ni-Cu-TiB2 coated mild steel had significantly higher hardness than uncoated mild steel. Using ASTM G1-03 and ASTM G-31 standards, a 0.2 M HCl immersion cycle test was conducted for 28 days to test the corrosion resistance of coatings in an acidic media (672Hrs). When compared to Zn-Ni-Cu and Zn-Ni-Cu-TiB2 coated mild steel, the weight loss for the uncoated mild steel was significantly larger. Additionally, XRD examination showed that coated samples had less rust on their surface than uncoated samples. Both Zn-Ni-Cu and Zn-Ni-Cu-TiB2 on Mild Steel were anti-corrosive, as evidenced by increased corrosion potential and reduced corrosion current density when compared to uncoated mild steel, according to electrochemical impedance spectroscopy (EIS)/Tafel study in 0.2 MHCl. The outcomes of each test were very encouraging and demonstrated the durability of these coatings against wear and corrosion.

Zaštita od korozije mekog čelika korišćenjem premaza od nanomaterijala

Effectiveness of nanoparticle coatings in preventing corrosion of mild steel metal samples were experimentally determined. TiO2 and ZrO2 nanoparticles coatings were done by brush coating. Different samples were prepared by varying the parameters such as thickness of coatings, concentration of nanoparticles and temperature of heat treatment. Corrosion rate of both uncoated mild steel and coated using TiO2, ZrO2 samples was determined in the corrosive environments of 1M HCl and 3.5 wt% NaCl. From the experiments it was found that the coated mild steel samples prepared at temperature 80oC are more effective than samples prepared at 200 oC. It is observed that TiO2 coatings prepared with ratio 2:0.3, 0.182 mm coating thickness and heat treated at 80oC, and ZrO2 coatings with thickness of 0.185 mm, prepared from nanoparticle paste of 1:0.3 ratios, heat treated at 80 oC, have shown better protection for mild steel in 1M HCl and 3.5% NaCl solutions compared with other TiO2 and ZrO2 coatings.

Corrosion behaviour OF HVOF deposited Zn–Ni–Cu and Zn–Ni–Cu–TiB2 coatings on mild steel

Abstract In this study, Zn–Ni–Cu and Zn–Ni–Cu–TiB2 coatings were deposited using high-velocity oxy-fuel (HVOF) thermal spray technique on a mild steel substrate. Corrosion tests like neutral salt spray (NSS) following (ASTM B-117) standard and immersion cycle test following ASTM G-31, ASTM G1-03, standards were carried out for Zn–Ni–Cu and Zn–Ni–Cu–TiB2 coated mild steel along with uncoated mild steel acting as a control. Both Zn–Ni–Cu and Zn–Ni–Cu–TiB2 coated mild steel were corrosion resistant as compared to uncoated mild steel. Raman analysis following the immersion cycle test inferred that uncoated mild steel had all forms of rust. While Zn–Ni–Cu and Zn–Ni–Cu–TiB2 coated mild steel developed very little rust. The characterization helped to understand the changes in the surface before and after tests. It was observed that both Zn–Ni–Cu and Zn–Ni–Cu–TiB2 coated mild steel had little corrosion degradation of surface as compared to uncoated mild steel. Suggesting that both coatings performed significantly better compared to uncoated mild steel in corrosive environments. Polarization and EIS tests of both coated and uncoated mild steel in a 3.5% NaCl medium helped to understand the behaviour of coatings over a range of frequencies. Both coated samples had high polarization potential E corr values and lower polarization current I corr values as compared to uncoated mild steel. Inferring better performance of coatings in corrosive environments as compared to uncoated mild steel.

Transitional Wear of Plasma Spray Cr2O3 and Cr3C2 Coatings Deposited on Low Carbon Steel

In the present work, transitional wear of atmospheric plasma sprayed Cr2O3 and Cr3C2 coatings on low carbon steel substrate have been investigated with coating thickness of 100μm and 200μm. The produced coated and uncoated mild steel substrate samples were characterized by means of microscopic examinations, hardness and sliding wear tests for varying parameters of load, sliding speed, and sliding distance, SEM analysis were carried out for characterization studies of worn surface of samples. The obtained results revealed that the wear rate was much lower in Cr3C2 coated samples followed by Cr2O3 coated samples on mild steel substrate. When comparison to chromium oxide composite coatings the chromium carbide coatings showed better improved results

Superhydrophobic, self-cleaning carbon nanofiber CVD coating for corrosion protection of AISI 1020 steel and AZ31 magnesium alloys

Global corrosion damages mandate the synthesis of superhydrophobic, self-cleaning protective surfaces possessing excellent mechanical, chemical, and thermal stability. Thus, a self-cleaning, superhydrophobic carbon nanofiber (CNF) coating on structural alloys AISI 1020 mild steel (MS) and Mg alloy (AZ31) with water contact angle (CA) 145°–150° and sliding angle of 7° ± 2° is fabricated by a novel two-step process of plasma sputter followed by CVD. An extraordinary self-buoyancy of the deposited CNFs coating was observed to be ~378 and ~257 times than that of its own deposited mass on the coated MS and AZ31, respectively. Further, the CNF coated MS, and AZ31 alloys displayed performance of corrosion protection efficiency of about 97% in 3.5 wt NaCl corrosive environment with a lower corrosion current density (Icorr = 0.16 and 14.90 μA/cm2 respectively) than that of uncoated one (Icorr = 5.56 and 691.8 μA/cm2, respectively). The charge transfer resistance (Rct) was obtained to be ~ four and two orders of magnitude greater than the uncoated MS (1.4 kΩ cm2) and AZ31 (2.0 kΩ cm2) alloys, respectively. Thus, this simple and straightforward process of making corrosion resistance superhydrophobic CNF coating can be potentially used for protecting structural alloys in various engineering applications.

Performance Assessment of Ship Hull Metal in Seawater Media

This research was undertaken to determine the effects of corrosion on material performance using mild steel and Aluminum as selected material in seawater media. The result from the experiment showed higher corrosion rate in uncoated mild steel coupon as higher corrosion rate ranges from 0.0494 mmpy, 0.0565 mmpy, and 0.0656 mmpy was evident, while a reduction in corrosion rate from 0.0369mmpy, 0.0432 mmpy and 0.0452mmpy was observed in the fourth week, fifth week and sixth week. Corrosion rate for coated mild steel ranges from 0.0396 mmpy in the first week and reduces to 0.0333 mmpy and continually reduces to 0.0206 mmpy in the sixth week. From the hardness testing device using MITECH 320, uncoated Mild steel metal specimen gave an average Brinell hardness reading of 112 before immersion and 105 after immersion to seawater. Also, the tensile strength of the uncoated mild steel specimen deteriorated from 414 Mpa before immersion to 403Mpa after immersion to seawater media. Also, uncoated Aluminum specimen gave a brinell average reading of 163 before immersion and 152 after immersion to the seawater media. Likewise, the tensile strength result of the aluminum specimen gave 776M pa before immersion and 744 Mpa after immersion to the seawater media. The overall result from weight loss technique and metal hardness using MITECH 320 showed aluminum metal is more resistive to corrosion attack.

Intelligent early structural health prognosis with nonlinear system identification for RFID signal analysis

The mechanical state of non-linear processes includes these characteristics such as multivariable, strong coupling, multiple vibration sources, large signal noise, and various random factors. The intrinsic relationship and overall consistency optimization of the characteristic factor direction paths of multi-source matrix signals are a new research hotspot in multi-source dynamic characteristic signal identification. A intelligent fault diagnosis and prognosis method based on NARMAX-FRF and PCA is proposed in this paper. This method can be widely used in industrial system fault diagnosis. This system solves many basic key problems, including identifying a non-linear model from a detected system, accurately solving the frequency response function, extracting a representative frequency domain from the frequency response function, and applying extracted system frequency domain features for large-scale structural health assessment. In order to verify the performance of the NARMAX_FRF and PCA method for nonlinear defect signal analysis, the experiment of intelligent RFID system of corrosion monitoring and the TOFD experimental system are analyzed for the structural health monitoring in this paper. The set of samples in the experiment of intelligent RFID system of corrosion monitoring consists of coated and uncoated mild steel plates, which have a patch that has been exposed to the environment for different durations to create different levels of corrosion. The results show the effectiveness and robustness of the proposed method.

Effect of Nano Structured NiFe and NiP Thin Layer Coatings on Structural and Mechanical Properties of Mild Steel

The nano crystalline thin coating of NiFe and NiP C has been successfully carried out by using electroplating technique in order to enhance the structural and mechanical properties of mild steel. The NiFe & NiP thin layers were coated on mild steel at constant current density and pH over a deposition period of 30 minutes. All the coated mild steel samples were subjected to various characterization techniques like X-ray Diffraction method (XRD), Vickers hardness, surface roughness and wear test to reveal the effect of NiFe and NiP on mild steel. The mechanical properties such as surface roughness and wear behavior were investigated by using Stylus profilometer and Pin on disc method. The coated mild steel exhibits enhanced mechanical properties than that of uncoated mild steel. The variations in structural and mechanical properties of coated mild steel were also studied.

Study on the properties of Ni-W-P coating with PTFE co-deposition

The Ni-W-P-PTFE composite coating with various contents of PTFE was successfully prepared on the surface of mild steel. Properties of microstructure, composition and anti-fouling performance of Ni-W-P-PTFE composite coating were further investigated. Results prove that the surface morphology of Ni-W-P-PTFE composite coating becomes rougher due to the aggregation function of PTFE particles. Deposition rate and microhardness of coating vary inversely with PTFE content due to polymerization and softness performances. Additionally, contact angle testing reveals that the surface free energy of coating decreases with more PTFE content deposited. All Ni-W-P-PTFE composite coatings have better anti-fouling performance compared with the uncoated mild steel surface. The deposition rate of calcium carbonate fouling can be inhibited by more PTFE particles. It was found that the best anti-fouling performance has been obtained by Ni-W-P-PTFE coating containing 12 ml l−1 PTFE in co-deposition process.

Improvement of erosion resistance of alumina-phosphate ceramic coating on mild steel by SiC addition

This research is focused on the application of the Al2O3-phosphate ceramic coating on mild steel surface to protect mild steel from erosion in coal dust environment. Erosion resistance of mild steel could be improved by overlay it with SiC in the Al2O3-phosphate ceramic coating. As a filler, Al2O3 was mixed with 20%, 40%, and 60% SiC by using aluminium phosphate as a binder and heated at 220 °C for 5 hours. X-ray diffraction testing was conducted to observe the phase of Al2O3-SiC phosphate ceramic coating. Meanwhile, surface morphology and adhesion characteristic of Al2O3-SiC phosphate ceramic coating were analyzed by scanning electron microscope. To analyze the erosion resistance quantitatively solid particle impingement test by applying gas jets at the right angle (90°) against a sample surface has been conducted. The results showed that Al2O3-SiC phosphate ceramic coating is strongly bound to the mild steel surface without the presence of any void. The higher the SiC content can increase the ceramic coating density and its erosion resistance. The SiC 60% produces four times higher erosion resistance than uncoated mild steel. The material characterization of Al2O3-SiC phosphate ceramic coating proves that SiC gives a significant impact on the enhancement of erosion resistance of the Al2O3-SiC phosphate ceramic coating.

Synergistic effect of the addition of TiO2 feedstock on solid particle erosion of Ni/Al2O3 and Ni/Cr2O3 coatings

Pipelines are widely used for transportation of solids in many chemical and mining industries. Erosion wear is considered as one of the important parameters which play a significant role in slurry transportation system by affecting both initial cost and life of slurry pipelines. Erosion wear of pipeline is not only important from the design aspect but also from the equipment performance, reliability and operational durability. In the present work, erosion wear due to solid-liquid mixture has been investigated using a slurry erosion pot tester. The erosion tests have been conducted on pipeline material Mild steel (M.S.) to establish the influence of rotational speed, particle size, solid concentration and time duration. Sand was taken as the erodent material with solid concentrations ranging from 10 to 40% (by weight). The experiments were performed at four different speeds such as 750, 1000, 1250 and 1500 rpm with time duration of 30, 60, 90 and 120 min. In the present study, 5% TiO2 feedstock powder was blended with 80Ni-15Cr2O3 and 80Ni-15Al2O3 coating powders to increase their erosion wear resistance. Coating powders are deposited on pipeline material by thermal spray HVOF coating. Experimental results indicate that erosion wear has a high dependence on rotational speed, time duration and nature of erodent solid particles. Significant improvement in erosion wear resistance was also observed with the addition of 5% Titanium dioxide (TiO2) feedstock powder. 80Ni-15Cr2O3–5TiO2 coating shows better performance against solid particle erosion as compared to 80Ni-15Al2O3–5TiO2. The results are compared with uncoated mild steel pipeline material.

Experimental study on corrosion-fouling relationship of Ni-W-P composite coating surface of heat exchanger

The ternary Ni-W-P coating was prepared on mild steel (1015) and the corrosion-fouling relationship was investigated. Meantime, the Ni-W-P coatings were characterized in terms of their properties and surface morphology by means of scanning electron microscope (SEM), x-ray diffraction (XRD) and electrochemical station. The result of fouling experiment shows that the Ni-W-P coating has better anti-fouling property than the uncoated mild steel surface. Additionally, both of the samples with or without Ni-W-P coating contain formation of calcites and aragonites in the same condition in the study. The uncoated mild steel adheres more aragonites while more calcites deposits on the surface of Ni-W-P coating. The corrosion experiment shows that due to the less corrosion cracks and pits producing, the Ni-W-P coating surface in different immersion stage inhibits the adhesion of fouling effectively compared with the uncoated mild steel surface. Furthermore, the phase structures of fouling are affected by the corrosion of samples with or without Ni-W-P coating differently due to the metal ions generated by corrosion. The work provides techniques that the corrosion resistance and anti-fouling performance should be combined to use when we apply surface modification in the fields of heat transfer.

Synthesis of biobased polyols using algae oil for multifunctional polyurethane coatings

Renewable sources – namely, algae oil and diacids – were used for the synthesis of alkyd (ALK) and polyesteramide (PEA) polyols. The prepared polyols were characterised by Fourier transform infrared and nuclear magnetic resonance techniques and size exclusion chromatography analysis. After reaction with diisocyanate, polyols were converted to polyurethane (PU) coatings, which were then characterised by X-ray diffraction, differential scanning calorimetry and thermogravimetric analysis. The biocidal activities of the films were evaluated against Gram-negative (Escherichia coli ) and Gram-positive bacteria (Staphylococcus aureus) by using the turbidity method as well as by observation of film degradation or biofilm formation by bacteria on the surface of a metal tray by using scanning electron microscopy. The PUs obtained using ALK and PEA showed better antimicrobial properties compared with PUs based on algae oil fatty amide (AOFA), monoglyceride (MG) and even an uncoated mild steel (MS) panel. The anticorrosion properties of PU coatings were evaluated by the potential dynamic polarisation (PDP) method in a 3·5 wt% sodium chloride (NaCl) corrosive media. All coated samples (ALK and PEA) showed good barrier properties against corrosion compared with AOFA, MG and the uncoated MS panel. The prepared algae-oil-based PU coatings showed better chemical, mechanical, water-repellent, antimicrobial, anticorrosive and thermal properties.

The influence of iodate ion additions to the bath on the deposition of electroless nickel on mild steel

ABSTRACTAn alkaline hypophosphite bath (0.1 M nickel sulphate, 0.2 M sodium hypophosphite, 0.2 M sodium acetate and 0.1 M malic acid, adjusted to pH 5) was used to produce Ni–P coatings on uncoated and electroless nickel pre-plated mild steel. The deposition was monitored by open-circuit potential-time monitoring vs. a saturated calomel reference electrode and potentiostatic current–time monitoring together with anodic and cathodic polarisation. Classical mixed potential theory was applied to the polarisation data to calculate the effect of controlled iodate ion additions (0–1000 ppm) as an accelerator to the electrolyte on the plating rate. The mixed potential and deposition current density increased gradually with potassium iodate concentration. The use of electrochemical data allowed the optimum iodate additive concentration to be established using simple instrumentation.

Corrosion protection of mild steel by graphene-based films

We explore the ability of reduced graphene oxide (RGO) and titanium dioxide-decorated RGO (RGO-TiO2) films to protect mild steel from corrosion in 3.5% NaCl. Graphene oxide (GO), prepared using a Modified Hummers method, was reduced using sodium borohydride. TiO2 nanostructures were generated on RGO in a dispersion. The synthesized materials were characterized using UV-visible spectroscopy (UV–vis), Fourier Transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), Thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The obtained results confirm the exfoliation of graphite, reduction of graphene oxide, and formation of predominantly anatase phase of TiO2, grown as nanotubes. Corrosion behaviour of mild steel, with coatings of GO, RGO and RGO-TiO2, was studied using Tafel polarization studies and Electrochemical Impedance Spectroscopy (EIS). Tafel results showed that GO, RGO and RGO-TiO2 shifted the corrosion potential anodically, indicating that they prevent the anodic dissolution of iron. A six order-of-magnitude reduction in the corrosion current was observed with GO-film-coated mild steel coupons, with further reduction resulting in the use of RGO and RGO-TiO2 composite films. Impedance analysis showed that the films exhibited significantly enhanced charge transfer resistance for corrosion of mild steel by more than an order of magnitude compared to uncoated mild steel.

Electrochemical Impedance Spectroscopy Evaluation of Organic Coating on Mild Steel

Electro-oxidation of 4-hydroxybenzalaniline in alkaline solution on mild steel surface was successfully carried out using cyclic voltammetric technique. Results demonstrated that brownish colour appeared on the mild steel surface after the cycle of voltammetric study. The presence of film was confirmed by the EIS measurement whereas the Nyquist plots obtained from EIS measurements were fitted with suitable electrical equivalent circuit. The coated mild steel exhibit better polarization resistance than uncoated mild steel.

Retardation of Mild Steel Corrosion in Analogous Schiff Bases with Different Electronic Environments

Two Schiff bases namely (E)-2-((phenylimino)methyl) phenol (SA1) and (E)-2-methoxy-6-((phenylimino)methyl) phenol (SA2) were produced via reaction of phenylamine with 2-hydroxybenzaldehyde and 2-hydroxy-3-methoxybenzaldenyde, respectively. The structures were elucidated through spectral and physicochemical techniques of melting point, elemental analysis (C, H and N), 1H Nuclear Magnetic Resonance (NMR) and Infrared (IR) spectroscopy. The distinctive n(C=N) and d(OH) peaks for SA1 and SA2 appeared at 1615 and 1613 cm-1 and at 13.27 and 13.37 ppm, respectively. Electrodeposit both compounds on mild steel at 0.05 M concentration in 0.3 M NaOH was established through cyclic voltammetry (CV) and chronoamperometry (CA) methods. Yellow and brownish Schiff base layers were observed to be formed on the mild steel specimens. The coated and uncoated mild steel specimens were tested for their corrosion behavior using the Tafel Extrapolation Method (TEM) in 0.5 M NaCl. Results demonstrated that mild steel coated with SA2 through CA technique at potential +0.90 V showed the highest inhibition efficiency, hence indicating a superior surface coverage, with 97.20 % inhibition efficiency; while SA1 recorded the highest inhibition efficiency of 93.83 % at coating potential of +1.35 V.