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Zinc-Nickel – environmentally friendly corrosion protection
Several methods had been tested in the past 18 months as a reaction on the EC directive 2000/53/EG on end-of-life vehicles, to realize the stipulated abdiction of chrome-VI-containing coatings. During extensive tests, several methods were analyzed, such as the thick-film passivation with or without finishing, or the treatment with zinc-nickel. Especially the excellent corrosion-protective characteristics were decisive to apply the last-mentioned method for the Hydrotechnik range of products. During a salt spray test in accordance to DIN 50021 SS, a base-metal corrosion could not be detected before an average of 720 hours at surfaces protected by zinc-nickel. In a cross-section test, a protection time of even more than 1,000 hours could be proved. The friction characteristics could be adapted to the level of the prior surface coating by applying a suitable lining. The Hydrotechnik products coated with zinc-nickel have an argentic matt-finished surface color and can be distinguished optically from their antecessors. Beside the improved environmental sustainability they comprise a thermal load capacity of up to 180 °C, and an improved insensitivity against contact corrosion with aluminium. Hydrotechnik will change over their complete range of MINIMESS® test points and fittings to zinc-nickel within the year of 2008. |
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Dec-05-2007 |
The Hydrotechnik GmbH will successively establish a zinc-nickel surface coating for the corrosion protection of their MINIMESS|
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Newsletter – News from Hydrotechnik The Hydrotechnik GmbH publishes a monthly newsletter, informing about news about the company and its products. Here you can download the current newsletter: Newsletter 2008/08 (pdf, 60 kB) |
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Sep-04-2008 |
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