| 摘要 |
Deposition of polyaniline layer on titanium comprises electropolymerization after hydrofluoric/nitric acid pickling, chemical conversion treatment and hydrolysis. Preferred Features: A titanium (alloy) substrate may be initially treated by alkaline degreasing for 10-15 minutes at 55-65 degrees C in a bath containing 36-44 g/l sodium tripolyphosphate (Na5P3O10), 40 g/l sodium tetraborate (Na2B4O7.10H2O), 10 ml/l Ref. 631 surfactant and sodium hydroxide to give pH 8.5-9.5 and by abrasive grit blasting to a surface roughness (Ra) of 10-30 mu m. The hydrofluoric/nitric acid pickling is carried out for 2-2.5 minutes at 18-22 degrees C in a bath containing 100-180 ml nitric acid (41 degrees Be), 40-60 ml hydrofluoric acid (48%), 1 g F68 additive, 1.5 g TA6V (metal) and 11 qsp distilled water. The deposit is baked at 40-160 degrees C for 30 minutes to 2 hours. |
