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FUNDAMENTALS OF FIRST AID
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Fundamentals of First Aid (OPMP)

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Fundamentals of First Aid (OPMP)

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Add Magnesium to the Car Body 04.01.2006

Thin rolled steel, from which car bodies are made, is coated with a layer of zinc to protect against corrosion.

Engineers from the Dortmund Center for Surface Physics (Germany) found that it is possible to significantly enhance the anti-corrosion properties of such a coating if magnesium is added to zinc.

In a pilot plant built at the Dortmund Center, a 7-micrometer-thick zinc-coated steel strip passes at a rate of meters per second through a vacuum chamber where magnesium vapor is blown over it. Locks are installed at the entrance and exit of the chamber, the air from which is pumped out by powerful pumps so that it does not penetrate into the chamber. Zinc is covered with a layer of magnesium a few nanometers thick. After additional heat treatment, magnesium atoms diffuse into the zinc surface. The resulting layer is more than ten times more resistant than conventional zinc coating.

In a special chamber, where a fog is created from a five percent solution of common salt (imitation of conditions on a winter road), galvanized steel after five days of stay is almost completely covered with rust.

Magnesium-zinc coating shows the first signs of corrosion only after 50 days. The work is funded by German automotive firms.

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