Study on the Properties of Nickel Coating Electroplated by Using Post-Supercritical Carbon Dioxide Mixed Watts Bath with Added Monoethanolamine

• Main Authors: Bo-Wei Wang, 王柏偉
• Other Authors: Chun-Ying Lee
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/jp9ujj

碩士 === 國立臺北科技大學 === 製造科技研究所 === 105 === The post supercritical carbon dioxide process is the first to complete the preparation of the plating solution into the reaction tank, the next step into the carbon dioxide after the establishment of pressure and control the temperature. So that carbon dioxide into a supercritical state after mixing with the plating solution for a period of time, and then make it release pressure to the implementation of electroplating at atmospheric pressure. At this time the plating solution contains supersaturated carbon dioxide Carbon dioxide will be precipitation reaction. When plating, there will be a lot of precipitated carbon dioxide bubbles on the surface of the substrate in the bath. When the bubble grows to a certain size will be affected by buoyancy to leave the substrate surface. So that plating has a similar effect of pulse plating. It will have better plating quality than the general plating process. However, there is a limit to the process. If you want to get better than the general plating of the coating, it must be used in the carbon dioxide has not completely returned to the atmosphere for plating, less than 20 minutes. Therefore, it is suitable for high current density and thinner coating. In this study, monoethanolamine was used as an additive for electroplating solution. The use of this solution can be used to capture carbon dioxide so that carbon dioxide remains in the bath. It is observed whether or not a significant reaction can be made in a low current density and a thicker coating, so the study experiment to Utilization of this solution of the characteristics. The experimental results show that the coating prepared by adding the monoethanolamine supercritical process will not reduce the hardness with the thickness of the coating, but also get smaller grain, and the ability of corrosion and abrasion resistance will be improved. Low current density also has good mechanical properties. These results show that monoethanolamine used in the post-supercritical process on the preparation of the coating can also have a good effect.