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The Formation Mechanism and Corrosion Resistance Behavior of Plating Ni-P Film on the Surface of Al18B4O33W/Al Composite

Author: ChiQingXin
Tutor: HuJin
School: Harbin Institute of Technology
Course: Materials Science
Keywords: Al18B4O33w/Al composite Electrodeposition Ni-P alloy Corrosion Amorphous
CLC: TG174.42
Type: Master's thesis
Year: 2010
Downloads: 32
Quote: 0
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Abstract


In this paper, the electrodeposited Ni-P amorphous alloy Al 18 B 4 O 33 w / Al composite surface formation process ; pretreatment process on the the electrodeposition layer structure and performance of the impact ; preliminary study of Ni-P alloy electrodeposition layer corrosion resistance and P elements in corrosion inhibition . Using scanning electron microscopy ( SEM ) , transmission electron microscopy (TEM), energy spectrum analysis ( EDS ) , X -ray diffraction (XRD) analysis and other analytical testing means to study the structure of the surface morphology and microstructure of Ni-P alloy deposited layer ; through the analysis potentiodynamic polarization curves and simulated seawater immersion experiment to study the deposition layer corrosion resistance . The study showed that the composites and pure metal electrodeposition process and the formation of the final deposition layer there are significant differences . Ni-P alloy particles initially formed crystalline state , and only in the surface of the Al matrix , rather than whisker nucleation and particle growth process into the amorphous state. With the electrodeposition time is increased , the thickness of the deposited layer of the surface of the composite material continues to increase , the particles Group with more closely to each other , the surface is more flat , the corrosion resistance can be enhanced . When electroplating after a certain time is reached , the composite material after plating corrosion basically unchanged. The experiments confirmed that with respect to the ordinary alloys , pretreatment composite material is also a necessary step before the electrodeposition process . Different pretreatment impact on the structure and properties of the deposited layer . The quality of the Ni-P alloy layer and the bonding strength of the base material combined effect of the decision of its corrosion resistance . Ni-P alloy electrodeposition layer corrosion pitting . Phosphorus in the surface enrichment and adsorbed on the surface of the nickel-phosphorous alloy , and to hinder the dissolution of the nickel in the process . Within a certain range , the higher the corrosion resistance of the alloy content of P can be better . The method used to adjust the pH was successfully prepared by the Ni-P gradient alloy layer , so that the material short corrosion mechanisms to produce a significant change , the formation and development of the pits was delayed , to improve the corrosion resistance of the material .

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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 > Metal preservatives,corrosion inhibitors
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