Abstract
Palladium plating was applied onto the titanium spraying powder, which should be consumed on thermal spraying by using a electroless plating process with sodium hypophosphite as a reducing agent. Then the Pd coated Ti powder was sprayed on the 304 type steel by vacuum plasma spraying system. The coating had a 2.8 mass percent Pd and it's distributed uniformly. The corrosion potential of the Ti-Pd coating in a 1N H2SO4 at 327K indicated the same level potential that Ti passivity zone or an about 0.45V nobler than that of the uncoated Ti sprayed coating, after immersing early stage into the solution. It's corrosion potential was moving to the more noble side slowly with increasing the immersion time. In addition, the anodic polarization characteristics of Ti-Pd coating showed a wide passive state and it's low corrosion current generation, thus showing excellent corrosion resistance.
