PVD coatings do not tarnish. This is due to their superior wear resistance, corrosion resistance, and chemical resistance, which are significantly higher than those of traditional electroplated coatings.
Detailed Explanation:
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Superior Wear Resistance and Corrosion Resistance: PVD coatings are four times harder than chrome, making them highly resistant to scratches and corrosion. This hardness is a key factor in preventing tarnishing, as tarnish often results from the degradation of softer materials under environmental exposure.
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Chemical Resistance: PVD coatings also exhibit excellent chemical resistance. This means they do not react with common chemicals that might cause tarnishing in other materials. This resistance is crucial for maintaining the original appearance of the coated items over time.
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Low Maintenance and Durability: Unlike traditional electroplating, which often requires a clear top coat that can degrade and lead to tarnishing, PVD coatings do not need additional protective layers. They maintain their integrity and appearance with minimal maintenance, ensuring they do not tarnish or fade.
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Uniform Coating and High Hardness: The uniform application of PVD coatings ensures that every part of the surface is equally protected, and the high hardness (second only to diamond) further enhances their resistance to tarnishing and other forms of degradation.
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Environmental Stability: PVD coatings are stable under UV radiation and do not discolor or tarnish when exposed to sunlight, which is a common cause of tarnishing in less resistant materials.
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Decorative Applications: In decorative applications, such as watches and hardware, PVD coatings are preferred because they maintain their brilliant finish without tarnishing, even with prolonged use and exposure. Manufacturers often provide long-term guarantees on the appearance of PVD-coated products, highlighting their confidence in the coating's resistance to tarnishing.
In summary, PVD coatings are an excellent choice for applications where resistance to tarnishing is critical, offering a durable, low-maintenance, and aesthetically superior finish that does not degrade over time.
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