| 摘要 |
The invention concerns a method for chemical attack of the surface of a plastic material with a solution based on sulphuric acid and chromic anhydride, characterised in that: (i) the sulphuric acid concentration ranges between 500 and 760 g/l and (ii) the chromic anhydride concentration ranges between 30 and 200 g/l and (iii) the resulting acidity is at least equal to 13 and at most equal to 16. |
