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Akeem Yusuf Adesina,Muzafar Hussain,Abbas Saeed Hakeem,Abdul Samad Mohammed,Muhammad Ali Ehsan,Ahmad Sorour 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
This study investigates the influence of heating rate on the tribological and corrosion properties of 52100 bearing steelsamples consolidated via spark plasma sintering. The consolidation was conducted at different heating rates of 50, 100,200, 300, and 400 °C/min and the thermomechanical properties of the resulting samples were characterized. Ball-on-disctribological tests and electrochemical techniques were used to evaluate the wear and corrosion resistance, respectively. The results showed that an increased heating rate positively affects the thermomechanical and tribological properties of52100 bearing steel. The sintered samples exhibited a low coefficient of friction (between 0.4 and 0.56) and a low wear rate(between 1.4 and 1.8 × 10−6 mm3/Nm) at heating rates between 100 and 400 °C/min. Furthermore, the corrosion resistanceof the samples gradually drops above the heating rate of 100 °C/min. The samples can be ranked in the order of decreasingcorrosion resistance thus: 100 > 200 > 300 > 400 > 50 °C/min. The improved corrosion resistance of the sample sintered at100 °C/min can be attributed to its refined crystal size and high density.
V. Jothi,Akeem Yusuf Adesina,A. Madhan Kumar,J. S. Nirmal Ram 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.11
This study aims to evaluate the influence of dicarboxylic acids (oxalic, malonic and succinic acid) used in anodizationbath on the surface and corrosion resistant performance of anodized films on AA2024 aerospace grade alloys. The surfacemorphology, topography, composition and structure of anodized samples were examined by scanning electron microscopy,optical profilometer, X-ray diffraction and attenuated total reflectance-infrared techniques. Characterization results revealedthe effect of dicarboxylic acids addition on the anodized film’s surface with important changes. X-ray Photoelectron Spectroscopicanalysis confirmed the presence of carboxylic groups on the porous anodized layer processed in anodization bathcontaining succinic acid. The electrochemical corrosion tests specified a solid relationship between the corrosion resistanceand the surface microstructure of the anodized layer processed in different dicarboxylic acids.