scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Residual stresses of nickel electrodeposits with ultrasonically agitated bath

01 Jan 1992-Journal of Materials Science Letters (Kluwer Academic Publishers)-Vol. 11, Iss: 21, pp 1424-1425
About: This article is published in Journal of Materials Science Letters.The article was published on 1992-01-01. It has received 15 citations till now. The article focuses on the topics: Residual stress & Electroplating.
Citations
More filters
Journal ArticleDOI
Ignacio Tudela1, Yi Zhang, Madan Pal, Ian Kerr, Andrew J. Cobley1 
TL;DR: In this paper, the authors summarized the fundamentals of the use of ultrasound and acoustic cavitation and how it may influence the electrodeposition of composite coatings with particles by commenting on some of the most significant works on this topic presented by the scientific community in the last decade.
Abstract: The electrodeposition of multifunctional composite coatings has rapidly emerged in the last decade due to the enhanced mechanical properties and corrosion resistance that such composite coatings exhibit compared to electroplated single metal and alloy deposits. Many studies have indicated that the implementation of ultrasound in composite electroplating processes can bring about many benefits, not only as a tool to improve the dispersion and de-agglomeration of particles in the electroplating bath, but also to enhance the incorporation of finely dispersed and uniformly distributed particles into the metal matrix. The present paper summarizes the fundamentals of the use of ultrasound and acoustic cavitation and how it may influence the electrodeposition of composite coatings with particles by commenting on some of the most significant works on this topic presented by the scientific community in the last 10 years. This paper will review these investigations and discuss how the ultrasonic parameters may affect the dispersion of the particles in the electrolyte and its effect on the characteristics of the composite coatings, generally resulting in the enhancement of the mechanical properties and corrosion resistance of the composite coatings. In addition, this paper will review some of the issues that may arise when using ultrasound in such processes and the pros and cons of the different transducer systems available, highlighting the need for detailed information regarding the ultrasonic parameters and equipment used when utilising sonication.

96 citations


Cites background from "Residual stresses of nickel electro..."

  • ...Other mechanical properties can also be improved by using ultrasound during the electrodeposition, Ni coatings being the best example, as sonication during electrodeposition increased the hardness [28], decreased the residual stress [29], and enhanced the wear [30] and fatigue strength [31] of the Ni deposits....

    [...]

Journal ArticleDOI
TL;DR: In this paper, the effect of ultrasonic power on the characteristics of low-frequency ultrasound-assisted electrodeposited Ni coatings from an additive-free Watts bath has been evaluated by different methods.
Abstract: The effect of ultrasonic power on the characteristics of low-frequency ultrasound-assisted electrodeposited Ni coatings from an additive-free Watts bath has been evaluated by different methods. XRD analysis showed that, while mechanical agitation favoured the electrocrystallization of Ni in the [211] direction, ultrasound promoted the electrodeposition of Ni with a [100] preferred orientation. FIB-SEM images of the surface of Ni deposits not only indicated that the surface structure agreed to some extent with the XRD results, but also that ultrasound refined, to a certain extent, some of the grains of the surface of the coatings. FIB-SEM images of the cross-section of the coatings confirmed this effect of ultrasound on the microstructure of the deposits. Such change in the microstructure of Ni, along with work-hardening by ultrasound, resulted in an increase in the hardness of the deposits. The characteristics of the deposits depended on the ultrasonic power employed, and it was found that Ni coatings electrodeposited using an ultrasonic power of 0.124 W/cm3 presented the higher proportion of crystals with a [100] preferred orientation, the highest degree of grain refinement in the surface and the highest microhardness values. Nevertheless, these deposits also presented visible erosion marks on the surface of the coatings due to the formation of transient bubble structures near the surface of the cathode during the electrodeposition. These erosion marks might be considered the main drawback to the use of ultrasound during the electrodeposition.

73 citations

Journal ArticleDOI
Zhong Zhao1, Liqun Du1, Yousheng Tao1, Li Qingfeng1, Lei Luo1 
TL;DR: The experimental results indicate that the ultrasonic agitation can decrease the polarization overpotential and increase the charge transfer process, which contributes to fabricating the electroforming layer with large adhesion strength.

27 citations

Journal ArticleDOI
TL;DR: The experimental results show that the imposition of the ultrasonic agitation decreases the polarization overpotential and increases the charge transfer process at the electrode-electrolyte interface during the electroforming process, which contributes to fabricating the Electroforming layer with large adhesion strength.

22 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented an effective approach for electroplating of coatings on the activated surface of pure Ti substrate using pulsed electro deposition, where a novel activating solution composed of HF, HCl, Ce(NO3)2, TiCl3, and bal.
Abstract: This paper presented an effective approach for electroplating of coatings on the activated surface of pure Ti substrate using pulsed electro deposition. Regarding the ceramic-like TiO2 barrier layer on its surface of Ti substrate to inhibit surface activity, a novel activating solution that composed of HF, HCl, Ce(NO3)2, TiCl3, and bal. DMF dissolvent was applied for surface modifications of Ti substrate in order to increase interfacial bonding strength of surface Ni coatings. Besides a comparative study of Ni nanocrystalline coatings without and with CeO2 addition was carried out for disclosing the role of the Ce-rich phase on managing microstructure and high-temperature oxidation resistance during oxidation at 800 or 1000 °C. Results indicated that Ce-rich precipitations, where dispersed along grain boundaries (GBs), were favorable for completing the spalling oxide-layers on Ni-CeO2 nanocomposite coatings during oxidation at 800 °C. Furthermore, an analytical modeling was validated for better understanding of Ce-rich precipitations along GBs defects for monitoring oxidation mechanisms. Furthermore, this finding would be therefore leading to the guidelines for Ce-rich precipitations on the strengthening of Ni-based superalloys.

22 citations