2004年8月3日
巴斯夫has patented a process for colouring aluminium in baths containing methanesulphonic acid (WO 2002/04717). This innovative new process makes it possible to obtain a realistic gold finish on aluminium surfaces.
In conventional processes, gold effects are obtained by anodising the aluminium and then applying the colour. Dyes are often used to colour the surface, but there are limitations on the performance of the dyes used to obtain gold effects. The shade often appears too yellow or too brown, and the lightfastness of the dyes is not always up to standard. “Much better results can be obtained if baths based on our high purity methanesulphonic acid are used instead of dyes”, explained Dr. Helmut Witteler, Head of Development and Applications Technology for Surface Finishing at BASF. “Instead of dyes, finely divided metal crystals are deposited in the aluminium oxide layer. This results in a realistic gold finish with excellent lightfastness. The metal crystals are deposited very evenly if the bath is based on methanesulphonic acid, and this does not depend on the position of the parts in the bath”, explained the chemist Dr. Witteler. BASF’s patented process enables aluminium finishers to obtain very level shades, especially gold shades, even on complex shapes. Another advantage is that the methanesulphonic acid process enables aluminium to be coloured up to 50 % more quickly compared to other processes.
巴斯夫以Lutropur®MSA的商品名在各种不同等级的商品名中供应甲烷二硫酸苯甲酸，尽管超纯化的电子级。甲磺酸很容易生物降解。它可以用于使用酸的金属精加工中的所有过程中。它比硫酸和普通，较不纯净的甲磺酸的优势是，可以防止锡，银和铜化合物形成污泥 - 从而节省了货币和能量。巴斯夫还生产和分发Lutropur®MSA，用作电镀浴缸的电解质。例如，甲磺酸用于镀金板的制造和印刷电路板的生产。巴斯夫目前正在与地表饰面领域的几家公司密切合作，Witteler博士邀请其他公司加入：“巴斯夫正在寻找更多的业界合作伙伴来开发新的过程，以用甲烷磺酸治疗金属表面”。
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