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MODIFICATION OF THE BLACK PACKAGING ON ALUMINIUM AND ALUMINIUM PACKAGING
MODIFICATION OF THE BLACK PACKAGING ON ALUMINIUM AND ALUMINIUM PACKAGING
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机译:铝上黑色包装的修改和铝包装
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摘要
To produce a coating of black colour on aluminium or an aluminium alloy, the metal or the alloy is treated with an alkaline aqueous solution containing nitrite ions, silicate ions, zinc ions and calcium and/or magnesium ions, the solution having a pH of 9 to 12.
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