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Quickly-Formed Self-lubricating Hard Coating on Surface of Aluminum Alloy

Author: LuChuang
Tutor: ZhouZuoï¼›XiongRenZhang
School: Nanjing University of Technology and Engineering
Course: Materials Science and Engineering
Keywords: Aluminum alloy Self - lubricating coatings Friction properties Corrosion resistance Hardness
CLC: TG174.4
Type: Master's thesis
Year: 2009
Downloads: 86
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Abstract


In this paper, a fast self-lubricating hard coating method for preparing the surface of an aluminum alloy , the method is for lubrication modifier the MoS 2 < / sub > particles using symbiotic deposition method on the aluminum hard anodizing process will MoS the 2 < / sub > particle deposition of in hard anodized film of the aluminum alloy , in order to achieve the purpose of improving the lubricating properties of film . By orthogonal experiment method to study the sulfuric acid - sulfuric acid - based oxalic acid mixed acid electrolyte system components and process parameters on the law of self-lubricating coating growth process and performance by scanning electron microscopy ( SEM ) , can spectroscopy (EDS) and other methods to observe the structural characteristics of the aluminum alloy self-lubricating coating , measured MoS 2 in the film distribution ; through the salt spray test , non-destructive thickness , which was means of micro hardness tester, micro friction tester equipment film corrosion , hardness, wear-resistant properties . Spectroscopy (EDS) analysis results show that the uniform distribution of the film prepared by the symbiotic deposition method four elements such as Al , O , Mo , S , Mo , S , of the total mass of 10 % ; friction performance test results produced by this method the film coefficient of friction of 0.2 , far lower than the friction coefficient of the hard oxide layer of 0.9 , and further confirmed that the film not only exist the MoS 2 < / sub > , and the MoS 2 < / sub > to improve the the lubricating performance of the film ; thickness test results show that the use of double-pulse current mode , in the joint under the effect of the additive aluminum hard self-lubricating film growth rate significantly increased , maximum growth rate 4um/min , is a conventional hard anodizing . 2 times; the test results of the salt spray test results of scanning electron microscopy (SEM) analysis of symbiotic aperture film deposition method becomes small, low porosity ; hardness test results show that the microhardness of the surface of the film prepared by this method is slightly improved ; the corrosion resistance is proportional to the film thickness of the film .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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