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Studies on Anti-Corrosion Behaviors of Electroless Deposited Ni-P and Ni-P-PTFE Coatings in Seawater

Author: LiuXueZhong
Tutor: TianJinTao
School: Ocean University of China
Course: Materials Physics and Chemistry
Keywords: Electroless plating Composite coating Electrochemical properties
CLC: TQ153.1
Type: Master's thesis
Year: 2010
Downloads: 125
Quote: 0
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Abstract


Electroless plating Ni-P plating because of its good corrosion resistance , abrasion resistance and are widely used in chemical, machinery, electronics and other industries . In order to further expand the chemical nickel plating range of applications in the chemical doped into a third particle can get better performance with plating nickel plating bath . PTFE particles having a strong chemical inertness, excellent non-tackiness and low surface energy, the PTFE particles are doped into the Ni-P plating layer can be combined with the advantages of PTFE particles and the Ni-P plating . Carbon steel surface was prepared using the electroless plating method in the Ni-P and the type of content of the PTFE particles of Ni - P - PTFE coating . By scanning electron microscopy ( SEM ) , energy dispersive spectroscopy ( EDS ) , X - ray diffraction ( XRD ) to observe the surface morphology of the coating , analyze the content of each element in the coating and the coating material phase composition ; by measuring the Ni-P and Ni - P - PTFE coating in natural seawater and sterile seawater by electrochemical impedance spectroscopy ( EIS ) studied the corrosion resistance of Ni-P and Ni - P - PTFE coating in natural seawater and sterile seawater . Experimental results show that : the Ni - P plating layer surface of a higher density compared to Ni - P- PTFE coating ; plating of Ni - P- PTFE , with an increase in the content of PTFE particles in the plating bath of the obtained Ni - P- PTFE the content of PTFE particles in the coating is gradually increased ; without a heat treatment of Ni-P and Ni - P - PTFE coating is amorphous coating ; EIS analysis results show that the impedance of the Ni - P and Ni - P- PTFE coating in sterilized seawater the value must be higher than the value of the impedance in natural seawater , for Ni - P- PTFE coating with the PTFE particle content increases , the corrosion resistance decreases .

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CLC: > Industrial Technology > Chemical Industry > Electrochemical industries > Electroplating industry > A single metal plating
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