| 摘要 |
This invention refers to a procedure for anodising aluminium or aluminium alloys in which an aluminium or an aluminium alloy part is submerged an in an aqueous solution at a temperature between 0°C and 140°C, preferably between 0°C and 130°C, in which said solution includes: - sulphuric acid, - tartaric acid, and - at least one inorganic salt of an transition metal and applying a controlled potential difference, wherein said aqueous acidic electrolyte is an aqueous, tartaric-sulphuric solution in which said solution has a concentration of sulphuric acid between 0.2 M and 0.9 M, L(+)-tartaric acid with a concentration between 0.2 and 0.8 M and one or several inorganic salts of one or several transition metals with a concentration between 1.10and 1 M, wherein an anodising procedure it takes between 5 and 120 minutes of time, obtaining layers of aluminium oxide with properties as good as or even better than those obtained through anodising in traditional chromic acid solutions. |
