Corrosion properties of Pt coatings by double glow plasma

Wu, Weiqi; Chen, Z F; Cong, Xiang Na

doi:10.1179/1743294412y.0000000020

Cited by 7 publications

(4 citation statements)

References 23 publications

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“…Before Ir and Ir–Rh alloys were used as an electrode material, Pt-based alloys (e.g., PtIr25, PtRh10) [6], as the central electrode of a spark plug, were used mostly for medium- and high-end engines. Although the performance of Pt-based alloys was qualified for the demands of new-generation engines [7,8,9], their application temperature, service life, and cost were still not optimal. Compared with platinum, iridium has the advantages of a higher melting point, higher strength, and better corrosion resistance [10].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Isothermal Oxidation of Ir–Rh Spark Plug Electrodes

Zhao

Xia

et al. 2019

Materials

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High-temperature oxidation tests were performed on pure iridium, rhodium, and the iridium alloys, IrRh10, IrRh25, and IrRh40, at 1100 °C in a stable air environment for 60 h. The results of the oxidation were analyzed by X-ray photoelectron spectroscopy (XPS). Microstructural changes of the Ir–Rh alloys were characterized by scanning electron microscopy (SEM). XPS analysis results show that the main oxide of the Ir–Rh alloy in a 1100 °C environment was Rh2O3, and SEM analysis shows that the surfaces of the Ir–Rh alloys after oxidation formed both linear and ellipse-shaped corrosion pits, and had the same direction with the wire-drawing process. The oxidation behavior of Ir–Rh alloys, including the mass change, the reason for the mass loss, and the role of Rh in improving oxidation resistance performance, are discussed.

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Section: Introductionmentioning

confidence: 99%

Microstructure and Isothermal Oxidation of Ir–Rh Spark Plug Electrodes

Zhao

Xia

et al. 2019

Materials

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“…A high density and strong adherent coating was obtained. [24][25][26] Therefore, a tantalum coating prepared by DPSA process is presented compared to the plain carbon steel in terms of mechanical properties and electrochemical behaviour in acid media. Scanning electron microscopy, energy dispersive spectrometry and X-ray diffraction characterisations were employed in order to evaluate the topography, chemical composition and phase identification of the samples.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and electrochemical properties of plasma tantalumising on low carbon steel

Wang

Zhang

et al. 2015

Surface Engineering

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Tantalum coating was successfully prepared onto Q235 low carbon steel substrate by a double glow plasma technique to improve the corrosion resistance. The microstructure and chemical composition of the coating were investigated by SEM, energy dispersive spectrometry and X-ray diffraction. The tantalum coating consisted of deposition layer, and the diffusion layer is ,33 mm in thickness, metallurgically adhered to the substrate. Nanoindentation tests were used to measure nanomechanical properties of the coating and the substrate. A comparative study of the corrosion resistance of the bared and tantalum coated steel was conducted by electrochemical measurements in 3?5 wt-%HCl solution respectively. The results show that the coated samples exhibit much higher hardness and better anticorrosion performance than the uncoated ones. The excellent corrosion resistance of tantalum coated steel was attributed to the low porosity for the coating and a compact, and the stable tantalum oxidation film formed on the surface of the steel to prevent the substrate contact with hydrochloric acid electrolyte.

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“…However, an intractable problem of adhesion in these surface treatment technologies is encountered due to a weak interaction between the Ta coating and the substrate. In previous works, [16][17][18] a strong adherent coating was obtained by double glow plasma technique. Double glow plasma technique can be used for almost any solid metallic element for surface alloying to metallic substrates.…”

Section: Introductionmentioning

confidence: 99%

Surface modification of pure titanium by plasma tantalumising

Chen

Wei

Huang

et al. 2013

Surface Engineering

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In order to improve corrosion resistance of pure titanium in strong acid solution, the tantalum modified layer was formed on the pure titanium surface by double glow plasma surface tantalumising. The modification layer was comprised of deposition layer and diffusion layer, which metallurgically adhered to the substrate. Tantalum element decreased with the case depth. The corrosion resistance of the tantalum modified layer in HCl solution was investigated by weight loss method and electrochemical measurements, and the corrosion morphology (SEM) was studied by SEM and X-ray diffraction. The annual corrosion rate of the modified layer was only 12 and 21% of pure titanium in 10 and 20 wt-% HCl solution respectively, and the corrosion rate was still small in 30% HCl solution. In concentrated acid for 120 h, it was found that there was significant pitting corrosion on the surface of pure titanium, while no pitting corrosion could be perceived in the modified layer. The main reason for the good corrosion resistance was a compact, stable tantalum oxidation film formed at the surface of the modified layer.

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Corrosion properties of Pt coatings by double glow plasma

Cited by 7 publications

References 23 publications

Microstructure and Isothermal Oxidation of Ir–Rh Spark Plug Electrodes

Microstructure and Isothermal Oxidation of Ir–Rh Spark Plug Electrodes

Microstructure and electrochemical properties of plasma tantalumising on low carbon steel

Surface modification of pure titanium by plasma tantalumising

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