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CATHODIC pROCESS AND wEAR reSISTANCE OF ELECTRO-DEpOSITED re-ni-w-p-sic composite coating

Acta Metallurgica Sinica(English Letters) 2002年第4期15卷 369-374页

作者： Z.C.Guo,X.Y.Zhu,R.D.Xu and X.w.YangFaculty of Material and Metallurgy Engineering, Kunming University of Science and Technology, Kunming650093, ChinaManuscript received 26 December 2001 in revised form 23 April 2002 Faculty of Mat. and Metall. Eng. Kunming Univ. of Sci. and Technol. Kunming 650093 China

Cathodic deposition current density of the composite coatings increases when sic par-ticles and rare earth (re) were added in the bath, which is profitable for ni- w-p alloy to deposit in the cathod, forming ni-w-p-sic and re-ni-w-p-sic composite coatings. On the contrary, the addition of pTFE in the bath decreases cathodic deposition current density of the coatings. The current density increases a little when the amount of re is 7-9g/l; however, the current density increases greatly when the amount of re is increased to 11-13g/l. Bui ij the amount of re is raised further, the current density decreases. Hardness and wear resistance of re-ni-w-p-sic composite coating have been studied, and the results show that the hardness and wear resistance of re-ni-w-p-sic composite coating increase with increasing heat treatment tempera-ture, which reach peak values at 400℃; while the hardness and wear resistance of the coating decrease with the rise of heat treated temperature continuously.

关键词： electrodeposition re-ni-w-p-sic composite coating cathodic process hardness and wear resistance

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STUDY ON pROpERTIES OF pULSE ELECTRODEpOSITED re-ni-w-p-sic composite coatingS

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Acta Metallurgica Sinica(English Letters) 2007年第2期20卷 111-116页

作者： Z.C. Guo X.Y. Zhu R.D. Xu Faculty of Materials and Metallurgical Engineering Kunming University of Science and Technology Kunming 650093 China

The effects of pulse frequency f and duty cycle r on the deposition rate, composition, morphology, and hardness of pulse electrodeposited re （rare earth）-ni-w-p-sic composite coatings have been studied. The results indicate that pulse current can improve the deposition rate of re-ni-w-p-sic composite coatings; w, p, and sic contents in the coating decrease with the increase of pulse frequency and reach the lowest value at f = 33Hz, whereas the re content in the composite coatings increases with the increase of pulse frequency. sic content decreases with the increase of duty cycle, w content reaches the lowest value, and p content reaches the highest value at r = 0.4; pulse current and re can lead to smaller size of the crystalline grains; however, the effects of different pulse frequency and duty cycle on the morphologies of re-ni-w-p-sic composite coatings are not obvious. The hardness of re-ni-w-p-sic composite coatings is the highest when the duty cycle is at 0.6 and 0.8 and pulse frequency is at 50Hz. At the same pulse frequency, the hardness of re-ni-w-p-sic composite coatings at r= 0.8 is higher than that at r= 0.6.

关键词： frequency duty cycle electrodeposition re-ni-w-p-sic composite coating

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