| 摘要 |
A method of treatment of a metal surface in which there can be metal oxides on the surface which includes applying to the surface a solution formulated to be substantially non-reactive with the oxide allowing this to perfuse through the oxide but to be substantially reactive with the underlying metal and to also include metals to act as a buffer to localise action on the underlying metal and further provide a pacivating coat the method including the further step of then coating such appropriate surface. The solution may contain a weak acid in substantial concentration (e.g. 57,3 %phosphoric acid and 36,7 %water) and significant quantities of a buffering and inhibiting type compound (e.g. 5,4 %urea) as well as soluble metal salts (e.g. 0,08% copper sulphate, 0.08% cobalt sulphate, 0,08% chromium sulphate, 0,08% nickel sulphate, 0,08% manganese sulphate and 0,08% zinc sulphate). |
