Surface modifications of Ni base alloy by Non-Isothermal Electroless Deposition

• Main Authors: Tsai, Sung-Ying, 蔡松穎
• Other Authors: Ger, Ming-Der
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/35402267710321804960

碩士 === 國防大學理工學院 === 應用化學碩士班 === 97 === With the characteristics of high specific strength, good malleability, lightweight, and lower cost, the Al-alloy is one of the most attractive metals for the application in bipolar plates (BPP). This study improved surface characteristics of 5052 Al-alloy by depositing Ni-Mo-P and Au coatings on the alloy substrate. Ni-Mo-P coatings were first deposited by conventional or non-isothermal deposition (NITD) electroless methods, and then an Au film was coated on Ni-Mo-P/Al by immersion deposited. The modified Al-alloy BPPs were investigated the corrosion resistance and electrical conductivity in PEMFC. The Al bipolar plates with such Ni-Mo-P and Au coatings reveal the best corrosion resistance (4.63×10-7 A/cm2) among all modified specimens. The electric conductivity and the Au film of the optimum Au/Ni-Mo-P/Al sample are 3.5 -cm and 0.6m, respectively. It is concluded that the Au/Ni-Mo-P multilayer prepared by this proposed approaches are very promising for the surface modification of Al bipolar plates.