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Tarnish is a thin layer of corrosion that forms over copper, brass, aluminum, magnesium, neodymium and other similar metals as their outermost layer undergoes a chemical reaction. Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish, although it may tarnish with oxygen over time. It often appears as a dull, gray or black film or coating over metal. Tarnish is a surface phenomenon that is self-limiting, unlike rust. Only the top few layers of the metal react, and the layer of tarnish seals and protects the underlying layers from reacting.

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  • فقد اللمعان
  • Anlaufen (Metallurgie)
  • Tarnish
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  • فقد اللمعان هو عبارة تحول في شكل انعكاس الضوء عن المادة بسبب تغطيتها بطبقة من الصدأ التي تتكون على سطح النحاس، النحاس الأصفر، الألومنيوم حيث أنه يحدث لهم تأكسد.
  • Anlaufen ist die Bildung eines dünnen Überzugs auf der Oberfläche von Metallen. Blei und Zink bedecken sich an feuchter Luft mit einer dünnen Schicht von Oxid oder Kohlensäuresalz, auf Silber entsteht in unreiner Luft ein Überzug von Schwefelsilber, Stahl bedeckt sich beim Erhitzen mit einer Oxidschicht, die je nach ihrer Stärke gelblich, rötlich oder blau erscheint (Anlauffarbe).
  • Tarnish is a thin layer of corrosion that forms over copper, brass, aluminum, magnesium, neodymium and other similar metals as their outermost layer undergoes a chemical reaction. Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish, although it may tarnish with oxygen over time. It often appears as a dull, gray or black film or coating over metal. Tarnish is a surface phenomenon that is self-limiting, unlike rust. Only the top few layers of the metal react, and the layer of tarnish seals and protects the underlying layers from reacting.
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  • فقد اللمعان هو عبارة تحول في شكل انعكاس الضوء عن المادة بسبب تغطيتها بطبقة من الصدأ التي تتكون على سطح النحاس، النحاس الأصفر، الألومنيوم حيث أنه يحدث لهم تأكسد.
  • Anlaufen ist die Bildung eines dünnen Überzugs auf der Oberfläche von Metallen. Blei und Zink bedecken sich an feuchter Luft mit einer dünnen Schicht von Oxid oder Kohlensäuresalz, auf Silber entsteht in unreiner Luft ein Überzug von Schwefelsilber, Stahl bedeckt sich beim Erhitzen mit einer Oxidschicht, die je nach ihrer Stärke gelblich, rötlich oder blau erscheint (Anlauffarbe).
  • Tarnish is a thin layer of corrosion that forms over copper, brass, aluminum, magnesium, neodymium and other similar metals as their outermost layer undergoes a chemical reaction. Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish, although it may tarnish with oxygen over time. It often appears as a dull, gray or black film or coating over metal. Tarnish is a surface phenomenon that is self-limiting, unlike rust. Only the top few layers of the metal react, and the layer of tarnish seals and protects the underlying layers from reacting. Tarnish actually preserves the underlying metal in outdoor use, and in this form is called patina. The formation of patina is necessary in applications such as copper roofing, and outdoor copper, bronze, and brass statues and fittings. Patina is the name given to tarnish on copper based metals, while Toning is a term for the type of tarnish which forms on coins.
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