| 摘要 |
An insulating fluoride film is formed on a metal surface such as Mg, Al, Cr, Fe, Ni, Cu, Zn, Pb, Zr, brasses, bronzes, stainless steels and "Monel" (Registered Trade Mark) by reacting the surface with an oxidizing carrier of fluorine such as gaseous or liquid fluorine, HF, halogen fluoride such as BrF3, ClF3, the fluoromethane and fluoroethanes, sulphur fluoride and hexafluoride. The fluoride film may be modified by treating with oxygen or the original surface may be treated simultaneously with a mixture of an oxidizing carrier of fluorine and oxygen. In the examples given copper is treated with fluorine vapour at 300 DEG or 500 DEG C. and an aluminium alloy is treated with HF vapour at 520 DEG C. Specifications 715,359 and 747,051 are referred to. |
