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The Duplex Treatment of Electroless Ni-P and Low-temperature Gas Multicomponent Thermochemical Treatment and Functional Properties of Composite Layer

Author: LiHaiSheng
Tutor: YangChuan
School: Southwest Jiaotong University
Course: Materials Science and Engineering
Keywords: Nickel-phosphorous electroless plating Low Temperature Gas Multicomponent Permeation Corrosion resistance Porous powder
CLC: TG174.4
Type: Master's thesis
Year: 2009
Downloads: 12
Quote: 0
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Abstract


By nickel- phosphorus electroless plating process and low-temperature gas multicomponent permeation process , the clear characteristics of each process , discover a chemical plating nickel-phosphorus and low-temperature gas heat treatment process of complex multicomponent permeation to improve material surface corrosion resistance requirements. Fe-Ni composite porous powder, and prepared based on this analysis its electromagnetic properties and absorbing properties . This article using nickel-phosphorous electroless plating technology , low-temperature gas yuan permeation technology, as well as low-temperature gas multicomponent permeation - nickel-phosphorous electroless plating composite technology Q235 steel samples surface , and the use of the yuan - nickel-phosphorus composite prepared Fe -Ni porous powder. Analysis of phase structure , surface morphology and micro-hardness , corrosion resistance of the test specimen , the composite powder thermogravimetric differential thermal analysis , the use of the magnetic characteristics of the measurement system (MPMS) and Agilent8720ET microwave vector network analyzer the test static magnetic properties of the composite powder , and the complex magnetic permeability and the complex permittivity . The results show that : the Low Temperature Gas Multicomponent permeation role in promoting the formation of Ni-P Deposits ; the composite processing samples after the corrosion resistance is about 10 times sample only nickel-phosphorous electroless plating resist performance , Low Temperature Gas Multicomponent infiltration sample resist performance 3-7 times; the composite sample processing , color processing , the surface of a variety of colors can be obtained ; porous powder of a high porosity can be obtained using the composite technology ; Fe - Ni composite powders for soft magnetic material, an argon gas atmosphere conducive to the system to remove the high saturation magnetization , the the composite porous powder of low coercive force ; argon atmosphere can effectively improve the real part and the imaginary part of the complex permittivity of the composite powder in the 20 GHz frequency range . On diversity - nickel phosphorus absorption characteristics of the composite powder design simulation and calculation results show that the processing temperature and processing the atmosphere significantly affect material microwave absorption properties : the composite powder obtained under the protection of 900 ° C argon in the S-wave and C - wave (2 - 6GHz) have a greater reflectance (R gt; 10dB) and preferably within the range of 1-20GHz attenuation characteristics ; interested in the presence of oxides adversely affect attenuation coefficient .

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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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