Pretreatment of magnesium substrates
A method and composition for pretreating magnesium substrates prior to the application of a protective and/or decorative surface coating is disclosed. The pretreatment composition comprises (a) a compound containing at least 4 phosphorus acid groups and (b) a soluble alkaline earth salt. In an examp...
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Zusammenfassung: | A method and composition for pretreating magnesium substrates prior to the application of a protective and/or decorative surface coating is disclosed. The pretreatment composition comprises (a) a compound containing at least 4 phosphorus acid groups and (b) a soluble alkaline earth salt. In an example, the composition comprises phytic acid, calcium chloride dihydrate and tetrafluoroboric acid and the pH is adjusted to 3 with potassium hydroxide. |
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