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As a replacement of cadmium coatings for fastening elements in the aerospace industry, Aalberts Surface Treatment GmbH has developed a combination of an ultra-thin PVD aluminium coating with the chromium(VI)-free passivation SurTec 650. This way the properties of the substrates steel and titanium, which are the core of the fasteners, are crossed with those of aluminium. Hence, the treated components do not show any risk of hydrogen embrittlement or contact corrosion even though they are made of steel or titanium. At the same time they are corrosion resistant and electrically conductive due to the passivation with SurTec 650.

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