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Passivation of zinc |
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Zinc Coating Index |
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| Passivation processes (also known as conversion coatings) are usually applied to zinc deposits to improve the life of the coating (White Corossion is the when the zinc corrodes). These coatings are usually based on hexavalent chromium chemistry providing unique surface corrosion resistance which will withstand even the most extreme conditions over prolonged periods. Zinc plating and passivation provides a double protection system for steel components. Virtually all types of steel can be protected included castings. The first protection comes from the conversion coating applied to the zinc and secondly from the sacrifial nature of the zinc to a steel substrate. Newly developed electrolytes and process methods are able to provide greatly increased corrosion prevention. In addition to the well known yellow full passivation, there are blue, olive and black variants available to meet modern requirements. |
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