Tungsten carbide coatings replace chromium.

Advanced Materials & Processes,  July, 2005  by Ruggiero, Peter F.

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For more than 70 years, hard chromium coatings have been "the gold standard" to impart resistance to wear, impact, and corrosion to components in aviation, transportation, industrial, and consumer products. However, in recent years, several performance limitations associated with hard chromium have driven the engineering community in both the military and civilian aerospace sectors, as well as many industrial sectors, to seek better coating materials, as well as more cost-effective methods to apply them.

[ILLUSTRATION OMITTED] Among the most promising alternatives are ...

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