Investigate Process of Electroless Nickel Plating and Study the Surface characteristics of Aluminum
| Autor: | Wei-Cheng Hong, 洪委成 |
|---|---|
| Rok vydání: | 2008 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 96 Surface treatment of electroless nickel in the industry has many applications in the field of corrosion-resistant, although this technology development has more than 60 years, aluminum and aluminum alloy plating on the no-pore of film coating of the electroless nickel is still facing challenges, the aluminum surface generate dense oxide Al2O3, not on easy to the surface treatment and deal with defects such as the formation of coating for example: pores, tumors, sparkling, exfoliate. The study is divided into four sections :pre-treatment of aluminum alloy aluminum substrate acid etching of the impact .Use a neutral detergent to remove the mechanical processing of oil, acetone ultrasound shock, ultrasound washed, 10 wt% NaOH 15 ℃ cleaning about 30 seconds, washed ultrasound, 15 wt% HNO3 at room temperature for acid etching three minutes, five minutes, seven minutes, eight minutes. Using SEM & EDS & AFM observation of aluminum sheet metal corrosion by the situation. EDS detection by residual elements of aluminum. Aluminum of secondary zincate by formation of zinc film of the discussion. To two soaking zincate and zinc stripping. The second road soaking zincate set to 10 seconds, 30 seconds, 50 seconds of reaction time, and the electroless plating. Using SEM& AFM observation 2-D and 3-D appearance of the grain distribution of Zn.Determination of its corrosion resistance and combination of force. Discussion of aluminum sheet metal used by the system of sputtering zinc film. To explore sputtering law and the choice of the feasibility of zinc materials. Experimental methods used to establish the pre-treatment cleaning of aluminum, into the RF magnetron sputtering machine splash zinc film, and the electroless nickel plating. Using SEM&EDS observation of the surface film of zinc crystal structure and composition of film ratio. Determination of its corrosion resistance and combination of force.The coating of corrosion resistance and combination of force on the surface roughness of the combination of the impact. Aluminum processing method will be different surface roughness in the same specimen (polished surface, NO.1200 grinding face, NO.600 grinding face) pre-processing, secondary Zincate, electroless nickel plating. In the treatment before and after the electroless nickel plating. Aluminum specimens measuring surface roughness,using SEM observe the coating surface roughness and cross-sectional thickness of coatings, determination of its corrosion resistance and combination of force. The four-part study, received pre-treatment the cleaning process using acetone ultrasound shock, ultrasound washed, 10wt% NaOH in 15 ℃ cleaning about 30 seconds, washed ultrasound, 15wt% HNO3 at room temperature for 8 minutes for the etching acid of the best parameters, and to take every road between the processes to strengthen ultrasound washed shocks, can be no excessive corrosion and Al-rich elements of the specimen. Aluminum of secondary zincate by SEM & AFM observed that the formation of zinc stripping the pit, Reaction of the second road soaking zincate film and the aluminum substrate of the interface between the light of combination of force, To the combination of force and corrosion resistance test, found second zincate of zinc films, the best reaction time - the first road soaking zincate 40 seconds, 50wt% HNO3 zinc stripping 10 seconds, the second road soaking zincate 30 seconds. Study shows that a sputtering reaction sediments of the law is feasible, but after tests found that zinc material is not suitable for the reaction of the material. The tests found that the corrosion-resistant surface roughness Ra value too low and too flat surface, the combination of insufficient coating, will significantly affect corrosion resistance. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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