News Column

Researchers from Nanjing University Discuss Findings in Coatings Technology

June 24, 2014

By a News Reporter-Staff News Editor at Journal of Technology -- Data detailed on Coatings Technology have been presented. According to news reporting originating in Jiangsu, People's Republic of China, by VerticalNews journalists, research stated, "In order to remedy the poor tribological properties and low micro-hardness for pure titanium (TA2) materials, the Ni-CeO2 nanocrystalline coating was deposited from a Watts-Nickel electrolyte on the modified surface of TA2 substrate. In the present study, an available method of chemical activation was innovatively employed to make surface modification for TA2 substrate, in which the modified surface was characteristic of a rough surface and fully covered by the Ce-rich conducting phase for better electrodeposition."

The news reporters obtained a quote from the research from Nanjing University, "In order to study the effect of surface pretreatments on the modified TA2 surface, the surface roughness profiles and average roughness values were carried out using optical profilometry on the measured surfaces. A predictive modeling of TA2 surfaces before and after surface pretreatments was compared and successfully validated for better understanding of the formation mechanisms of electrodeposited Ni coatings reinforced with CeO2 nanoparticles. To clarify the beneficial effects of CeO2 addition on surface morphologies, phase composition, and textural evolution, the as-received nanocrystalline coatings were evaluated using various analytical techniques such as XRD, FE-SEM/EDX, and TEM. In addition, the scratch tests performed with an acoustic emission (AE) detector were conducted for the determination of interfacial adhesion between the as-deposited coating and the modified surface of TA2 substrate. Tribological properties and micro-hardness of investigated specimens were also examined. Experimental results revealed that this innovatively chemical activation was more favorable for increasing interfacial adhesion. The existence of well-distributed CeO2 phase that precipitated along the defective grain boundaries in the coating was contributed to make particulate reinforcement, thereby achieving better structural densification for Ni-CeO2 coatings."

According to the news reporters, the research concluded: "Meanwhile it exhibited superior tribological properties of the Ni-CeO2 coatings as compared to those of pure nickel and TA2 substrate, which was mainly attributed to the Ce-rich abrasive products that acted as a self-lubricating phase to make the effect of solid lubricants on worn surfaces."

For more information on this research see: Surface morphologies, tribological properties, and formation mechanism of the Ni-CeO2 nanocrystalline coatings on the modified surface of TA2 substrate. Surface & Coatings Technology, 2014;249():6-18. Surface & Coatings Technology can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland. (Elsevier -; Surface & Coatings Technology -

Our news correspondents report that additional information may be obtained by contacting X.W. Zhou, Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Jiangsu, People's Republic of China.

Keywords for this news article include: Asia, Jiangsu, Coatings Technology, People's Republic of China

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Source: Journal of Technology

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