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Naval ships are constructed with mild steel. Corrosion is a major concern in a marine environment. This particular type of material degradation has recently received more attention by the marine industry. Effort is make my researchers to combat this problem. In this work, co-deposition of Zn-ZnO-Ant hill powder composite coating on mild steel was reported with the view to combat this problem. The Ant hill powder was varied from 0 to 25 g. A 10 mL of orange juice was used as an organic additive. The coating thickness, surface roughness, microstructure, hardness values, wear rate and potentiodynamic polarization in simulated sea water were determined. The addition of orange juice as an additive changed the morphological and texture of the coating, and the hardness values, wear and corrosion rate were enhanced. Maximum corrosion protection efficiency of 92.86% and 94.41% was obtained at Zn-ZnO-25gAnt hill and Zn-ZnO-25gAnt hill + orange juice, respectively. The work has established that Zn-ZnO-Ant hill powder composite coating on mild steel is promising.

The effect of varying temperature, concentration, and time on the corrosion rate of mild steel in 0.5 M H 2 SO 4 acid with and without (wild jute tree) grewia venusta plant extract has been investigated by weight loss. The temperature, concentration of inhibitor and time were varied in the range of 0-10% v/v at 2% v/v interval, 30-70 ∘ C at 20 ∘ C interval, and 45-270 minutes at 45 minutes interval respectively. Scanning electron microscope was used to analyze the morphology of the sample surface. Linear regression equation and analysis of variance (ANOVA) were employed to investigate the influence of process parameters on the corrosion rate of the samples. The predicted corrosion rate of the samples was found to lie close to those experimentally observed ones. The confirmation of the experiment conducted using ANOVA to verify the optimal testing parameters shows that the increase in inhibitor concentration above 2% v/v and time would reduce the corrosion rate. The results also showed that the increase in temperature would also increase the corrosion rate greatly and that the plant extract was very effective for the corrosion inhibition of mild steel in acidic medium.

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The feasibility of using extract of Grewa Venusta (wild jute tree) root as corrosion inhibitor with mild steel was investigated using gravimetric and electrochemical techniques in . The results showed that corrosion rate increased with an increase in temperature, and decreased with an increase in inhibitor's concentration and time; maximum inhibition efficiency was 97.60% and 99.88% in the presence of KI -addition, and was assumed to occur via adsorption of the inhibitor molecules on the metal surface. The extract contains metallic elements such as calcium, magnesium, mono acetate (C5H10O4) and 4H-Pyrazole (C9H10F6N2S) that suppressed the anodic dissolution. The adsorption of the extract molecules on the mild steel surface obeys Langmuir adsorption isotherm. The results showed that the inhibitor acted as a mixedtype inhibitor.

This paper aims to investigate the mechanical (tensile, hardness, impact, elongation), microstructure and wear behaviours of aluminium alloy reinforced with mussel shell powder (MSP) at different weight percentages (0 wt. % to 15 wt. %) at 3 wt. % interval. The mussel shell powder was characterized by X-ray fluorescence (XRF). The matrix and the composites’ morphology were studied using a scanning electron microscope attached with energy dispersive spectroscopy for the distribution of mussel shell powder particles within the matrix. The wear behaviour of the alloy and composites produced at various reinforcements were carried out using a Taber abrasion wear-testing machine. The XRF showed the compositions of MSP to contain calcium oxide (95.70 %), silica (0.83 %) and others. Mechanical properties showed that tensile values increase with increases in MSP, hardness value increases from 6 wt. % to 15 wt. % of MSP. The impact energy decreased from 42.6 J at 3 wt. % to 22.6 J at 15 wt. %; the percentage elongation also decreased from 37.4 % at 3 wt. % to 20.5 % at 15 wt. % MSP, respectively. The bending stress results increase with increases in the percentage of reinforcement. The morphologies revealed that uniform distribution of MSP within the matrix resulted to improvement in mechanical properties. The wear resistance of the composites increases with increase in the applied load and decreases with increases in the weight percentage of MSP and can be used in the production of brake pads and insulators in the automobile industry.