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The Activation Procedure In Electroless Nickel Plating Of Wood

Posted on:2008-07-08Degree:MasterType:Thesis
Country:ChinaCandidate:G Q GaoFull Text:PDF
GTID:2121360218959816Subject:Materials Processing Engineering
Abstract/Summary:PDF Full Text Request
In this paper, based on the principle of obtaining the active nickel according to the high temperature heat-reduced and the normal temperature oxidation-reduction ways and means, the author activated the wood using the nickel activated method instead of the palladium activated process for the first time. With a number of experiments in this paper, the author gain the normal temperature nickel activated method which is fit for the wood electroless nickel plating relatively. It has an important meaning to further research on the new non-noble metal activation process in electroless nickel plating on wood and it has practical significance to exploit new functional wood composite material of electromagnetic shielding and electrostatic resistance.Research results are summed up as follows:1. Comparing the uniformity degree and the electric capability of the plating layers on the wood which were treated with KH550 water solution and KH550 ethanol solution separately, we found that the uniformity degree and the electric capability of the plating layers on the wood which were treated with KH550 ethanol solution were better than the plating layers on the wood which were treated with KH550 water solution. Therefore, the ideal surface disposal process as follows: KH550 ethanol solution; solution concentration 5%; disposal temperature 40℃; disposal time 3min.2. It placed a premium on the electroless nickel plating reactivity on wood surface successfully, using the normal temperature nickel activated method. The results show that it is the ideal activation process in wood electroless nickel plating. It showed that the nickel sulfate hexahydrate concentration, the Sodium hydroxide concentration and the activation time have more effects on the activation impact on the wood surface than the Sodium borohydride concentration and Hydrochloric acid concentration. The ideal activation process parameter as follow: The nickel sulfate hexahydrate concentration 15g·L-1;The Sodium borohydride concentration 15g·L-1; The Sodium hydroxide concentration 10-15 g·L-1;Hydrochloric acid concentration 10-15 g·L-1;The activation time in A solution 9min, the activation time in B solution 90s.3. It made certain the effects of the main salt concentration and the reducer concentration on the activation impacts of the wood surface in the high temperature nickel activated method on wood electroless nickel plating. The nickel granule came into being on the wood surface when the activation temperature was higher than 160℃and the activation time was longer than 10min.It had less effects of the soakage temperature and soakage time to the activation impacts. The soakage temperature may not exceed 50℃as well. The ideal high temperature nickel activation process parameter as follow: Nickel acetate concentration 70g·L-1;Sodium hypophosphite concentration 70 g·L-1;Soakage temperature 40℃;Soakage time 5min ;activation time 30min;Activation temperature 170℃.4. First, it made the electroless nickel plating on the wood blocks which were treated with palladium colloid activation process or the normal temperature nickel activated method or the high temperature nickel activated method separately when the other conditions were equal. Second, the performances of the plating layers were mensurated. The last, it made sure that the normal temperature nickel activated process was fit for the wood electroless nickel plating, considering the specialities of the wood and comparing the appearance qualities and the combine strength and the electric capability and the uniformity degree of the plating layers which were treated with the different activation process.
Keywords/Search Tags:Wood, Electroless nickel plating, Nickel activation, Heat-reduced, Surface disposal
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