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Effects of nano-MoS2 additive on manganese phosphate composite conversion coating of carbon steel
Young-Tai Noh,변영민,Ho-Young Kim,Jong-Kyu Park,Son-Gyo Seo,Chi-Hwan Lee 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.10
Manganese phosphate is an industrial coating material used to reduce friction and improve lubrication in sliding components. In this study, the morphology and tribological properties of uncoated carbon steel and carbon steel coated with only manganese phosphate and with manganese phosphate with nano-MoS2 were investigated. This work shows the effects of nanoMoS2 on the formation of manganese phosphate coatings on steel. The manganese phosphate composite conversion coatings are created by chemical treatment, and the main component of the layer is hureaulite (Mn,Fe)5H2(PO4)4·4H2O. With regard to the effects of nano-MoS2 on the surface of composite coatings, it is obvious that the crystals of coatings formed more compactly with an increase in the nano-MoS2 content from 0 to 5 g/L. The surface microstructure of the coatings formed in a bath with nano-MoS2 was more uniform than that formed in a bath without nano-MoS2. It can be seen that there is a decrease in the size of the domed structure and in the surface roughness as the content of MoS2 increased in the nanocomposite coatings. The effect of MoS2 on the friction and wear behaviors of composite conversion coatings at 3 g can be a very effective deterrent for tribological of decrease.
Experimental Investigation of Wear Characteristics on Manganese Phosphate Coated AISI D2 Steel
Sivakumaran Ilaiyavel,Alankaram Venkatesan 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
Manganese Phosphate is an Industrial coating used to reduce friction and improve lubrication in sliding components. In this study, the tribology behavior of uncoated, manganese phosphate coated, Manganese Phosphate with Molybdenum disulphide (MoS2) coated AISI D2 steels was investigated. The Surface morphology of manganese phosphate coatings was examined by Scanning Electron Microscope (SEM) and Energy Dispersive X-ray Spectroscopy (EDX). The wear tests were performed in a pin on disk apparatus as per ASTM G-99 Standard. The wear resistance of the coated steel was evaluated through pin on disc test using a sliding velocity of 0.35 m/s under normal load of 10 to 60 N at the controlled condition of temperature and humidity. The Coefficient of friction and wear loss were evaluated. The temperature rise after 15 min and 30 min were recorded for each load. Wear pattern of uncoated, manganese phosphate coated and Manganese Phosphate with Molybdenum disulphide (MoS2) coated pins were captured using Scanning Electron Microscope (SEM). Based on the results of the wear test, the manganese phosphate with Molybdenum disulphide (MoS2) coating exhibited the lowest average coefficient of friction 0.15 and the lowest wear loss 0.6 mm3 under 60 N loads.
인산망간 피막의 아질산나트륨 첨가가 내식성에 미치는 영향에 대한 연구
민경섭(Kyong-Sub Min) 산업기술교육훈련학회 2020 산업기술연구논문지 (JITR) Vol.25 No.3
This paper describes an effective metal finishing technology for obtaining manganese phosphate coatings on steel. In this study, the effect of sodium nitrite addition on the corrosion resistance of a manganese phosphate coating was investigated. The microstructure, surface morphology, and chemical composition were analyzed by FE-SEM, EDS, and XRD, while the cross-sectional images and thickness of the coating layer were analyzed by FIB. According to the results of the EDS analysis, the main components of the manganese phosphate coating were C, O, P, Mn, and Fe. The XRD results showed that (Mn,Fe)5H2(PO4)4 4H2O in the manganese phosphate coating layer was formed by a chemical reaction between manganese phosphate and elements in the underlying carbon steel. Additionally, electrochemical polarization testing was carried out in order to evaluate the corrosion protection properties of the manganese phosphate coating in a 3.5 wt.% NaCl solution. The corrosion resistance of the phosphate coating was remarkably improved by adding sodium nitrite.
기계적 연마 전처리가 인산망간 피막의 윤활 특성에 미치는 영향
김호영(Ho-Young Kim),노영태(Young-Tai Noh),전준혁(Jun-Hyuck Jeon),강호상(Ho-Sang Kang) 한국표면공학회 2019 한국표면공학회지 Vol.52 No.6
In this study, the effect of mechanical polishing of carbon steel on the tribological properties of manganese phosphate coating on carbon steel has investigated. The microstructure, surface morphology and chemical composition were analyzed by SEM, EDS, and XRD. The surface roughness test was carried out in order to calculate Rvk value by 3D laser microscopy. Also, the tribology property of manganese phosphate coating was tested by ball-on disk. In the results of EDS analysis, coating layer consists of elements such in Mn, P, Fe, and O. XRD showed that (Mn,Fe)₅H₂(PO₄)₄·₄H₂O in manganese phosphate coating layer was formed by the chemical reaction between manganese phosphate and elements in carbon steel. As the mechanical polishing degree increased, the friction coefficient was reduced. The rougher the mechanical polishing degree, the better corrosion resistance was obtained.
Park, Jun-Ho,Park, Jin-Hwan,Jeong, Seonghun,Han, Heung Nam,Mun, Junyoung Elsevier 2018 ELECTROCHIMICA ACTA Vol.282 No.-
<P><B>Abstract</B></P> <P>Mechanochemically coating over-lithiated layered oxide with the multi-functional VOPO<SUB>4</SUB> is studied by using that VOPO<SUB>4</SUB> is capable of accommodating lithium ions that are reversibly inserted/extracted at 3.8 V vs. Li/Li<SUP>+</SUP> and exerts a surface-stabilizing effect. The impregnation with VOPO<SUB>4</SUB> relieves the characteristic irreversible problems of over-lithiated layered oxide, since the initial fully delithiated structure of VOPO<SUB>4</SUB> provides extra lithium storage sites and thus compensates for the unavoidable loss of irreversible charging capacity of VOPO<SUB>4</SUB> during the first cycle. Interestingly, VOPO<SUB>4</SUB> loadings below 1 wt. % improves cycleability, whereas higher loadings result in unfavorable kinetic hindrance. Additionally, VOPO<SUB>4</SUB>-coated samples exhibit enhanced thermal stability due to featuring reduced decomposition exothermicity and increase thermal runaway onset temperature.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Wi, S.,Kim, J.,Lee, S.,Kang, J.,Kim, K.H.,Park, K.,Kim, K.,Nam, S.,Kim, C.,Park, B. Pergamon Press 2016 ELECTROCHIMICA ACTA Vol.216 No.-
The micron-sized LiMn<SUB>0.8</SUB>Fe<SUB>0.2</SUB>PO<SUB>4</SUB> (LMFP) mesocrystals with high volumetric density were successfully synthesized via a solvothermal method. The LMFP mesocrystals, composed of ~30-nm-sized nanocrystallites, exhibit a high tap density of ~1.2g/cm<SUP>3</SUP>. The synthesis of such nano-sized crystals was rendered by ascorbic acid which serves as surface-energy modifier. Interestingly, the ascorbic acid also directed the primary nanocrystals to anisotropic aggregations, and the growth mechanisms were rationally identified by TEM and x-ray diffraction. For reversible Li insertion/extraction, the interconnected particles within the mesocrystals were coated by conductive carbon, and the enhancement of the electrochemical properties (i.e. high specific capacity and good rate capability) was assessed by galvanostatic cycling. We believe that this work provides one of the routes to design electrochemically-favorable meso/nano-structures, which is of great potential for improving the battery performance by tuning the morphology of particles at the multi-length scale.