| 摘要 |
An aluminum conversion coating composition for aluminum or an aluminum alloy. The composition has as essential ingredients alkali metal permanganate, and alkali metal chloride, a pH of 7 or over, and a phosphorous compound selected from phosphorous acid and alkali metal phosphate. The composition may also contain a buffer, such as alkali metal tetraborate, alkali metal metaborate, benzoic acid, alkali metal benzoate, alkali metal carbonate and a mixture of the alkali metal tetra-and metaborates. I also provide a permanganate coating process for protecting the 2000 series by cleaning the aluminum alloy and before coating, deoxidizing the aluminum alloy with an acid.
|
