Data on the effect of current density relationship on the super-alloy composite coating by electrolytic route

In thiswork,adetaileffectofnanoparticleloadingandimproved process parameteronthesynthesisofmodified Zn-TiO2 electrocodeposited nanocompositecoatingwaspresented.Thecoatings wereperformedatconstanttimeof20minuteatastirringrateof 400rpmattemperatureof70 °C. Theeffectofparticleloadingand inputcurrentonthepropertiesoftheelectrocodepositedNano- composite wasstudied.Theco-depositionwascarriedoutata current intervalbetween1.0and1.5Aforthecoatingperiod.The basis ofbathformulationasitquantitativelyandqualitatively affects thecoatingsystemwasputintoconsideration.Hence,the electrocodeposition dataforthecoatingpropertiesandcoatingper unit areawereattained.Also,theeffectofannealingheattreatment on thehardnesspropertiesofthenanocompositecoatingswas carried out.Theannealingtemperatureusedwas250 °C soasto ascertain thethermalstabilityofthecoatingsandtoachieve homogenisation ofthecoatingsystem.Theweightgainedunder difference coatingconditionwereattainedandcouldbeapplied using modified Zn-TiO2 electrocodepositednanocompositecoat- ings asaneffectiveandsafealternativecoatingtochromiumand other harmfulcoatings

Effect of Avogadro natural oil on the corrosion inhibition of mild steel in hydrochloric acid solution

The inhibition action of Avogadro natural oil on corrosion of mild steel in one molar hydrochloric acid solution was investigated by gravimetric and potentiodynamic polarization techniques. The surface morphology of as-corroded samples was assessed with high resolution scanning transmission electron microscopy equipped with energy dispersive spectroscopy (HR-STEM/EDS). From the results, the presence of Avogadro natural oil in the metal–acidic interface decreased the corrosion rate with all the exposure times. The inhibition efficiency (%IE) increases with the concentration of the inhibitor considered. Results obtained from gravimetric measurements indicate that the natural oil exhibited higher efficiencies of 93.26 % after 384 h of exposure time and 98.26 % recorded in the potentiodynamic polarization method, both at 4.5 g/v inhibitor addition. Equally, results from the linear polarization indicated higher potential value with an increase in the polarization resistance (R p) and lower current density for the inhibited samples than the uninhibited mild steel sample. The inhibitive effect of this oil was explained in view of adsorption on the metal surface. The adsorption process follows the Langmuir adsorption isotherm

Effect of WO3 Nanoparticle Loading on the Microstructural, Mechanical and Corrosion Resistance of Zn Matrix/TiO2-WO3 Nanocomposite Coatings for Marine Application

In this study, for marine application purposes, we evaluated the effect of process parameter and particle loading on the microstructure, mechanical reinforcement and corrosion resistance properties of a Zn-TiO2-WO3 nanocomposite produced via electrodeposition. We characterized the morphological properties of the composite coatings with a Scanning Electron Microscope (SEM) equipped with an Energy Dispersive Spectrometer (EDS). We carried out mechanical examination using a Dura Scan hardness tester and a CERT UMT-2 multi-functional tribological tester. We evaluated the corrosion properties by linear polarization in 3.5% NaCl. The results show that the coatings exhibited good stability and the quantitative particle loading greatly enhanced the structural and morphological properties, hardness behavior and corrosion resistance of the coatings. We observed the precipitation of this alloy on steel is greatly influenced by the composite characteristics

Corrosion-wear of NST 60-Mn steel in Cocoa Mucilage

Abstract: This paperpresents thereport of an investigationon the effect of differentmicrostructures ofNST-60 Mn steel on its corrosion wear resistance in cocoa mucilage The corrosion wear resistance was investigated under an instrumented pin-on-disc wear test rig. The microstructure of the steel was varied by heat treatment procedures such as water-quenching, austempering, martempering and water-quenching plus tempering at 250 o C. A variation of the pH, time of exposure and applied load on the corrosion wear resistance of the heat treated sampleswere evaluated. The results obtained showed that hardness is inversely proportional to the rate of wear of the NST-60 Mn steel. Also, the microstructure of the water-quenched sample exhibited the greatest wear resistance in air, cocoa mucilage of pH3.9 and pH4.2 while the as-received NST 60 Mn steel showed the poorest corrosion wear resistance in the same media

Spatial and Seasonal Concentration of Glyphosate, Nitrate, and Phosphate in Kuti Stream, Yaba, Abaji Area Council, FCT Abuja, Nigeria

This study determines the concentration of glyphosate (C3H8NO5P), nitrate (NO3-), and phosphate (PO43-) in Kuti stream, Abaji area council, Federal Capital Territory Abuja, Nigeria, for twelve months (January-December, 2019) at four sampling stations that were 500 m apart. Samples were collected monthly during the morning hours (06.00-10.00 h) from a depth of 5–10 cm below the water surface using high-density polyethylene bottles and analyzed by adopting standard protocols. Samples analyzed for C3H8NO5P concentration were pooled quarterly with the highest (0.27±0.01 mg/l) concentration observed in July-September at station 2, lowest (0.02±0.01mg/l) in January-March at station 4. Seasonal concentration differed significantly (P ≤ 0.05), rainy season had 0.12mg/l, dry season had 0.06 mg/l. NO3 - and PO43- had their highest concentration (1.82±0.01mg/l; 0.87±0.01mg/l) in June at station 2 and 1, lowest (0.23±0.06mg/l; 0.21±0.05mg/l) in January and December at station 4 and 3. Rainy season had high concentration (1.82±0.01mg/l; 0.87±0.01 mg/l) of NO3- and PO43- compared to dry season (0.23±0.01 mg/l; 0.21±0.01mg/l). Pairwise correlation coefficients show a strong positive relationship (r=0.53/1.00) between PO43- and C3H8NO5P. The mean concentration of C3H8NO5P, NO3- and PO43- (0.09±0.01 mg/l; 0.59±0.04 mg/l; 0.37±0.02 mg/l) were below the maximum contamination limit (MCL) of 0.7 mg/l, 50 mg/l and 5.0 mg/l by USEPA, WHO and NERN. The high concentrations observed in the rainy season and station 2 were linked to runoff and riparian agriculture, though their mean concentrations were low if not monitored, will increase and become harmful to aquatic and human lives, therefore, conservation farming was suggested

Marked variability in institutional deliveries and neonatal outcomes during the COVID-19 lockdown in Nigeria

Background The coronavirus disease 2019 (COVID-19) pandemic and the interventions to mitigate its spread impacted access to healthcare, including hospital births and newborn care. This study evaluated the impact of COVID-19 lockdown measures on newborn service utilization in Nigeria. Methods The records of women who delivered in hospitals and babies admitted to neonatal wards were retrospectively reviewed before (March 2019–February 2020) and during (March 2020–February 2021) the COVID-19 pandemic lockdown in selected facilities in Nigeria. Results There was a nationwide reduction in institutional deliveries during the COVID-19 lockdown period in Nigeria, with 14 444 before and 11 723 during the lockdown—a decrease of 18.8%. The number of preterm admissions decreased during the lockdown period (30.6% during lockdown vs 32.6% pre-lockdown), but the percentage of outborn preterm admissions remained unchanged. Newborn admissions varied between zones with no consistent pattern. Although neonatal jaundice and prematurity remained the most common reasons for admission, severe perinatal asphyxia increased by nearly 50%. Neonatal mortality was significantly higher during the COVID-19 lockdown compared with pre-lockdown (110.6/1000 [11.1%] vs 91.4/1000 [9.1%], respectively; p=0.01). The odds of a newborn dying were about four times higher if delivered outside the facility during the lockdown (p<0.001). Conclusions The COVID-19 lockdown had markedly deleterious effects on healthcare seeking for deliveries and neonatal care that varied between zones with no consistent pattern